diff --git a/driver/tests/tex_demo/color.h b/driver/tests/tex_demo/color.h
index 319ccd9b..708565a3 100644
--- a/driver/tests/tex_demo/color.h
+++ b/driver/tests/tex_demo/color.h
@@ -62,10 +62,7 @@ struct ColorARGB {
     this->value = rhs.value;
   }
 
-  uint32_t toRGBA() const {
-    // swap B/R channels
-    return (this->value & 0xff00ff00)
-         | ((this->value >> 16) & 0xff) 
-         | ((this->value & 0xff) << 16);
+  operator uint32_t() const {
+    return this->value;
   }
 };
\ No newline at end of file
diff --git a/driver/tests/tex_demo/demo b/driver/tests/tex_demo/demo
index dfc9944f..9f9bfc7a 100755
Binary files a/driver/tests/tex_demo/demo and b/driver/tests/tex_demo/demo differ
diff --git a/driver/tests/tex_demo/kernel.bin b/driver/tests/tex_demo/kernel.bin
index c45a9ed5..8ee38e84 100755
Binary files a/driver/tests/tex_demo/kernel.bin and b/driver/tests/tex_demo/kernel.bin differ
diff --git a/driver/tests/tex_demo/kernel.c b/driver/tests/tex_demo/kernel.c
index 554a4aee..8e4dbf28 100644
--- a/driver/tests/tex_demo/kernel.c
+++ b/driver/tests/tex_demo/kernel.c
@@ -20,11 +20,10 @@ void kernel_body(int task_id, void* arg) {
 	uint32_t yoffset = task_id * _arg->tile_height;	
 	uint8_t* dst_ptr = (uint8_t*)(_arg->karg.dst_ptr + xoffset * _arg->karg.dst_stride + yoffset * _arg->karg.dst_pitch);
 
-	float fu = xoffset * _arg->deltaX;
 	float fv = yoffset * _arg->deltaY;
-
 	for (uint32_t y = 0; y < _arg->tile_height; ++y) {
 		uint32_t* dst_row = (uint32_t*)dst_ptr;
+		float fu = xoffset * _arg->deltaX;
 		for (uint32_t x = 0; x < _arg->tile_width; ++x) {
 			int32_t u = (int32_t)(fu * (1<<20));
 			int32_t v = (int32_t)(fv * (1<<20));
diff --git a/driver/tests/tex_demo/kernel.dump b/driver/tests/tex_demo/kernel.dump
index 70d6d534..b03f2f87 100644
--- a/driver/tests/tex_demo/kernel.dump
+++ b/driver/tests/tex_demo/kernel.dump
@@ -6,10 +6,10 @@ Disassembly of section .init:
 
 80000000 <_start>:
 80000000:	00000597          	auipc	a1,0x0
-80000004:	23458593          	addi	a1,a1,564 # 80000234 <vx_set_sp>
+80000004:	23858593          	addi	a1,a1,568 # 80000238 <vx_set_sp>
 80000008:	fc102573          	csrr	a0,0xfc1
 8000000c:	00b5106b          	0xb5106b
-80000010:	224000ef          	jal	ra,80000234 <vx_set_sp>
+80000010:	228000ef          	jal	ra,80000238 <vx_set_sp>
 80000014:	00100513          	li	a0,1
 80000018:	0005006b          	0x5006b
 8000001c:	00002517          	auipc	a0,0x2
@@ -18,13 +18,13 @@ Disassembly of section .init:
 80000028:	e3860613          	addi	a2,a2,-456 # 80001e5c <__BSS_END__>
 8000002c:	40a60633          	sub	a2,a2,a0
 80000030:	00000593          	li	a1,0
-80000034:	5d0000ef          	jal	ra,80000604 <memset>
+80000034:	5d4000ef          	jal	ra,80000608 <memset>
 80000038:	00000517          	auipc	a0,0x0
-8000003c:	4d450513          	addi	a0,a0,1236 # 8000050c <__libc_fini_array>
-80000040:	484000ef          	jal	ra,800004c4 <atexit>
-80000044:	524000ef          	jal	ra,80000568 <__libc_init_array>
+8000003c:	4d850513          	addi	a0,a0,1240 # 80000510 <__libc_fini_array>
+80000040:	488000ef          	jal	ra,800004c8 <atexit>
+80000044:	528000ef          	jal	ra,8000056c <__libc_init_array>
 80000048:	008000ef          	jal	ra,80000050 <main>
-8000004c:	48c0006f          	j	800004d8 <exit>
+8000004c:	4900006f          	j	800004dc <exit>
 
 Disassembly of section .text:
 
@@ -41,13 +41,13 @@ Disassembly of section .text:
 80000074:	01f00493          	li	s1,31
 80000078:	00151513          	slli	a0,a0,0x1
 8000007c:	fff50513          	addi	a0,a0,-1
-80000080:	3f8000ef          	jal	ra,80000478 <__clzsi2>
+80000080:	3fc000ef          	jal	ra,8000047c <__clzsi2>
 80000084:	40a48533          	sub	a0,s1,a0
 80000088:	fd551073          	csrw	0xfd5,a0
 8000008c:	01442503          	lw	a0,20(s0)
 80000090:	00151513          	slli	a0,a0,0x1
 80000094:	fff50513          	addi	a0,a0,-1
-80000098:	3e0000ef          	jal	ra,80000478 <__clzsi2>
+80000098:	3e4000ef          	jal	ra,8000047c <__clzsi2>
 8000009c:	40a484b3          	sub	s1,s1,a0
 800000a0:	fd649073          	csrw	0xfd6,s1
 800000a4:	00442783          	lw	a5,4(s0)
@@ -96,7 +96,7 @@ Disassembly of section .text:
 80000150:	04f12427          	fsw	fa5,72(sp)
 80000154:	04f12223          	sw	a5,68(sp)
 80000158:	04e12627          	fsw	fa4,76(sp)
-8000015c:	1d4000ef          	jal	ra,80000330 <vx_spawn_tasks>
+8000015c:	1d8000ef          	jal	ra,80000334 <vx_spawn_tasks>
 80000160:	05c12083          	lw	ra,92(sp)
 80000164:	05812403          	lw	s0,88(sp)
 80000168:	05412483          	lw	s1,84(sp)
@@ -107,8 +107,8 @@ Disassembly of section .text:
 80000174:	00000793          	li	a5,0
 80000178:	00078863          	beqz	a5,80000188 <register_fini+0x14>
 8000017c:	80000537          	lui	a0,0x80000
-80000180:	50c50513          	addi	a0,a0,1292 # 8000050c <__stack_top+0x8100050c>
-80000184:	3400006f          	j	800004c4 <atexit>
+80000180:	51050513          	addi	a0,a0,1296 # 80000510 <__stack_top+0x81000510>
+80000184:	3440006f          	j	800004c8 <atexit>
 80000188:	00008067          	ret
 
 8000018c <kernel_body>:
@@ -116,502 +116,501 @@ Disassembly of section .text:
 80000190:	0305a683          	lw	a3,48(a1)
 80000194:	0345a603          	lw	a2,52(a1)
 80000198:	02e507b3          	mul	a5,a0,a4
-8000019c:	0405a687          	flw	fa3,64(a1)
-800001a0:	0445a507          	flw	fa0,68(a1)
-800001a4:	f00007d3          	fmv.w.x	fa5,zero
-800001a8:	10f6f7d3          	fmul.s	fa5,fa3,fa5
-800001ac:	02f68833          	mul	a6,a3,a5
-800001b0:	d017f5d3          	fcvt.s.wu	fa1,a5
-800001b4:	10a5f5d3          	fmul.s	fa1,fa1,fa0
-800001b8:	00c80833          	add	a6,a6,a2
-800001bc:	06070663          	beqz	a4,80000228 <kernel_body+0x9c>
-800001c0:	800027b7          	lui	a5,0x80002
-800001c4:	dd07a007          	flw	ft0,-560(a5) # 80001dd0 <__stack_top+0x81001dd0>
+8000019c:	0445a507          	flw	fa0,68(a1)
+800001a0:	02f68833          	mul	a6,a3,a5
+800001a4:	d017f5d3          	fcvt.s.wu	fa1,a5
+800001a8:	10a5f5d3          	fmul.s	fa1,fa1,fa0
+800001ac:	00c80833          	add	a6,a6,a2
+800001b0:	06070e63          	beqz	a4,8000022c <kernel_body+0xa0>
+800001b4:	0405a687          	flw	fa3,64(a1)
+800001b8:	f0000053          	fmv.w.x	ft0,zero
+800001bc:	800027b7          	lui	a5,0x80002
+800001c0:	dd07a087          	flw	ft1,-560(a5) # 80001dd0 <__stack_top+0x81001dd0>
+800001c4:	1006f053          	fmul.s	ft0,fa3,ft0
 800001c8:	0385a783          	lw	a5,56(a1)
-800001cc:	00000893          	li	a7,0
-800001d0:	20000653          	fmv.s	fa2,ft0
+800001cc:	20108653          	fmv.s	fa2,ft1
+800001d0:	00000893          	li	a7,0
 800001d4:	00000513          	li	a0,0
-800001d8:	04078063          	beqz	a5,80000218 <kernel_body+0x8c>
-800001dc:	1005f753          	fmul.s	fa4,fa1,ft0
-800001e0:	00080693          	mv	a3,a6
-800001e4:	00000713          	li	a4,0
-800001e8:	c0071653          	fcvt.w.s	a2,fa4,rtz
-800001ec:	10c7f753          	fmul.s	fa4,fa5,fa2
-800001f0:	c00717d3          	fcvt.w.s	a5,fa4,rtz
-800001f4:	50c7d7eb          	0x50c7d7eb
-800001f8:	00f6a023          	sw	a5,0(a3)
-800001fc:	0385a783          	lw	a5,56(a1)
-80000200:	00170713          	addi	a4,a4,1
-80000204:	00d7f7d3          	fadd.s	fa5,fa5,fa3
-80000208:	00468693          	addi	a3,a3,4
-8000020c:	fef760e3          	bltu	a4,a5,800001ec <kernel_body+0x60>
-80000210:	0305a683          	lw	a3,48(a1)
-80000214:	03c5a703          	lw	a4,60(a1)
-80000218:	00188893          	addi	a7,a7,1
-8000021c:	00a5f5d3          	fadd.s	fa1,fa1,fa0
-80000220:	00d80833          	add	a6,a6,a3
-80000224:	fae8eae3          	bltu	a7,a4,800001d8 <kernel_body+0x4c>
-80000228:	00008067          	ret
+800001d8:	04078263          	beqz	a5,8000021c <kernel_body+0x90>
+800001dc:	1015f753          	fmul.s	fa4,fa1,ft1
+800001e0:	200007d3          	fmv.s	fa5,ft0
+800001e4:	00080693          	mv	a3,a6
+800001e8:	00000713          	li	a4,0
+800001ec:	c0071653          	fcvt.w.s	a2,fa4,rtz
+800001f0:	10c7f753          	fmul.s	fa4,fa5,fa2
+800001f4:	c00717d3          	fcvt.w.s	a5,fa4,rtz
+800001f8:	50c7d7eb          	0x50c7d7eb
+800001fc:	00f6a023          	sw	a5,0(a3)
+80000200:	0385a783          	lw	a5,56(a1)
+80000204:	00170713          	addi	a4,a4,1
+80000208:	00d7f7d3          	fadd.s	fa5,fa5,fa3
+8000020c:	00468693          	addi	a3,a3,4
+80000210:	fef760e3          	bltu	a4,a5,800001f0 <kernel_body+0x64>
+80000214:	0305a683          	lw	a3,48(a1)
+80000218:	03c5a703          	lw	a4,60(a1)
+8000021c:	00188893          	addi	a7,a7,1
+80000220:	00a5f5d3          	fadd.s	fa1,fa1,fa0
+80000224:	00d80833          	add	a6,a6,a3
+80000228:	fae8e8e3          	bltu	a7,a4,800001d8 <kernel_body+0x4c>
+8000022c:	00008067          	ret
 
-8000022c <_exit>:
-8000022c:	00000513          	li	a0,0
-80000230:	0005006b          	0x5006b
+80000230 <_exit>:
+80000230:	00000513          	li	a0,0
+80000234:	0005006b          	0x5006b
 
-80000234 <vx_set_sp>:
-80000234:	fc002573          	csrr	a0,0xfc0
-80000238:	0005006b          	0x5006b
-8000023c:	00002197          	auipc	gp,0x2
-80000240:	f6c18193          	addi	gp,gp,-148 # 800021a8 <__global_pointer>
-80000244:	7f000117          	auipc	sp,0x7f000
-80000248:	dbc10113          	addi	sp,sp,-580 # ff000000 <__stack_top>
-8000024c:	40000593          	li	a1,1024
-80000250:	cc102673          	csrr	a2,0xcc1
-80000254:	02c585b3          	mul	a1,a1,a2
-80000258:	40b10133          	sub	sp,sp,a1
-8000025c:	cc3026f3          	csrr	a3,0xcc3
-80000260:	00068663          	beqz	a3,8000026c <RETURN>
-80000264:	00000513          	li	a0,0
-80000268:	0005006b          	0x5006b
+80000238 <vx_set_sp>:
+80000238:	fc002573          	csrr	a0,0xfc0
+8000023c:	0005006b          	0x5006b
+80000240:	00002197          	auipc	gp,0x2
+80000244:	f6818193          	addi	gp,gp,-152 # 800021a8 <__global_pointer>
+80000248:	7f000117          	auipc	sp,0x7f000
+8000024c:	db810113          	addi	sp,sp,-584 # ff000000 <__stack_top>
+80000250:	40000593          	li	a1,1024
+80000254:	cc102673          	csrr	a2,0xcc1
+80000258:	02c585b3          	mul	a1,a1,a2
+8000025c:	40b10133          	sub	sp,sp,a1
+80000260:	cc3026f3          	csrr	a3,0xcc3
+80000264:	00068663          	beqz	a3,80000270 <RETURN>
+80000268:	00000513          	li	a0,0
+8000026c:	0005006b          	0x5006b
 
-8000026c <RETURN>:
-8000026c:	00008067          	ret
+80000270 <RETURN>:
+80000270:	00008067          	ret
 
-80000270 <spawn_tasks_callback>:
-80000270:	fe010113          	addi	sp,sp,-32
-80000274:	00112e23          	sw	ra,28(sp)
-80000278:	00812c23          	sw	s0,24(sp)
-8000027c:	00912a23          	sw	s1,20(sp)
-80000280:	01212823          	sw	s2,16(sp)
-80000284:	01312623          	sw	s3,12(sp)
-80000288:	fc0027f3          	csrr	a5,0xfc0
-8000028c:	0007806b          	0x7806b
-80000290:	cc5026f3          	csrr	a3,0xcc5
-80000294:	cc3029f3          	csrr	s3,0xcc3
-80000298:	cc002773          	csrr	a4,0xcc0
-8000029c:	fc002673          	csrr	a2,0xfc0
-800002a0:	800027b7          	lui	a5,0x80002
-800002a4:	00269693          	slli	a3,a3,0x2
-800002a8:	ddc78793          	addi	a5,a5,-548 # 80001ddc <__stack_top+0x81001ddc>
-800002ac:	00d787b3          	add	a5,a5,a3
-800002b0:	0007a483          	lw	s1,0(a5)
-800002b4:	0104a403          	lw	s0,16(s1)
-800002b8:	00c4a683          	lw	a3,12(s1)
-800002bc:	0089a933          	slt	s2,s3,s0
-800002c0:	00040793          	mv	a5,s0
-800002c4:	00d90933          	add	s2,s2,a3
-800002c8:	03368433          	mul	s0,a3,s3
-800002cc:	00f9d463          	bge	s3,a5,800002d4 <spawn_tasks_callback+0x64>
-800002d0:	00098793          	mv	a5,s3
-800002d4:	00f40433          	add	s0,s0,a5
-800002d8:	0084a683          	lw	a3,8(s1)
-800002dc:	02c40433          	mul	s0,s0,a2
-800002e0:	02e907b3          	mul	a5,s2,a4
-800002e4:	00d40433          	add	s0,s0,a3
-800002e8:	00f40433          	add	s0,s0,a5
-800002ec:	00890933          	add	s2,s2,s0
-800002f0:	01245e63          	bge	s0,s2,8000030c <spawn_tasks_callback+0x9c>
-800002f4:	0004a783          	lw	a5,0(s1)
-800002f8:	0044a583          	lw	a1,4(s1)
-800002fc:	00040513          	mv	a0,s0
-80000300:	00140413          	addi	s0,s0,1
-80000304:	000780e7          	jalr	a5
-80000308:	fe8916e3          	bne	s2,s0,800002f4 <spawn_tasks_callback+0x84>
-8000030c:	0019b993          	seqz	s3,s3
-80000310:	0009806b          	0x9806b
-80000314:	01c12083          	lw	ra,28(sp)
-80000318:	01812403          	lw	s0,24(sp)
-8000031c:	01412483          	lw	s1,20(sp)
-80000320:	01012903          	lw	s2,16(sp)
-80000324:	00c12983          	lw	s3,12(sp)
-80000328:	02010113          	addi	sp,sp,32
-8000032c:	00008067          	ret
+80000274 <spawn_tasks_callback>:
+80000274:	fe010113          	addi	sp,sp,-32
+80000278:	00112e23          	sw	ra,28(sp)
+8000027c:	00812c23          	sw	s0,24(sp)
+80000280:	00912a23          	sw	s1,20(sp)
+80000284:	01212823          	sw	s2,16(sp)
+80000288:	01312623          	sw	s3,12(sp)
+8000028c:	fc0027f3          	csrr	a5,0xfc0
+80000290:	0007806b          	0x7806b
+80000294:	cc5026f3          	csrr	a3,0xcc5
+80000298:	cc3029f3          	csrr	s3,0xcc3
+8000029c:	cc002773          	csrr	a4,0xcc0
+800002a0:	fc002673          	csrr	a2,0xfc0
+800002a4:	800027b7          	lui	a5,0x80002
+800002a8:	00269693          	slli	a3,a3,0x2
+800002ac:	ddc78793          	addi	a5,a5,-548 # 80001ddc <__stack_top+0x81001ddc>
+800002b0:	00d787b3          	add	a5,a5,a3
+800002b4:	0007a483          	lw	s1,0(a5)
+800002b8:	0104a403          	lw	s0,16(s1)
+800002bc:	00c4a683          	lw	a3,12(s1)
+800002c0:	0089a933          	slt	s2,s3,s0
+800002c4:	00040793          	mv	a5,s0
+800002c8:	00d90933          	add	s2,s2,a3
+800002cc:	03368433          	mul	s0,a3,s3
+800002d0:	00f9d463          	bge	s3,a5,800002d8 <spawn_tasks_callback+0x64>
+800002d4:	00098793          	mv	a5,s3
+800002d8:	00f40433          	add	s0,s0,a5
+800002dc:	0084a683          	lw	a3,8(s1)
+800002e0:	02c40433          	mul	s0,s0,a2
+800002e4:	02e907b3          	mul	a5,s2,a4
+800002e8:	00d40433          	add	s0,s0,a3
+800002ec:	00f40433          	add	s0,s0,a5
+800002f0:	00890933          	add	s2,s2,s0
+800002f4:	01245e63          	bge	s0,s2,80000310 <spawn_tasks_callback+0x9c>
+800002f8:	0004a783          	lw	a5,0(s1)
+800002fc:	0044a583          	lw	a1,4(s1)
+80000300:	00040513          	mv	a0,s0
+80000304:	00140413          	addi	s0,s0,1
+80000308:	000780e7          	jalr	a5
+8000030c:	fe8916e3          	bne	s2,s0,800002f8 <spawn_tasks_callback+0x84>
+80000310:	0019b993          	seqz	s3,s3
+80000314:	0009806b          	0x9806b
+80000318:	01c12083          	lw	ra,28(sp)
+8000031c:	01812403          	lw	s0,24(sp)
+80000320:	01412483          	lw	s1,20(sp)
+80000324:	01012903          	lw	s2,16(sp)
+80000328:	00c12983          	lw	s3,12(sp)
+8000032c:	02010113          	addi	sp,sp,32
+80000330:	00008067          	ret
 
-80000330 <vx_spawn_tasks>:
-80000330:	fc010113          	addi	sp,sp,-64
-80000334:	02112e23          	sw	ra,60(sp)
-80000338:	02812c23          	sw	s0,56(sp)
-8000033c:	02912a23          	sw	s1,52(sp)
-80000340:	03212823          	sw	s2,48(sp)
-80000344:	03312623          	sw	s3,44(sp)
-80000348:	fc2026f3          	csrr	a3,0xfc2
-8000034c:	fc102873          	csrr	a6,0xfc1
-80000350:	fc002473          	csrr	s0,0xfc0
-80000354:	cc5027f3          	csrr	a5,0xcc5
-80000358:	01f00713          	li	a4,31
-8000035c:	0cf74463          	blt	a4,a5,80000424 <vx_spawn_tasks+0xf4>
-80000360:	030408b3          	mul	a7,s0,a6
-80000364:	00100713          	li	a4,1
-80000368:	00a8d463          	bge	a7,a0,80000370 <vx_spawn_tasks+0x40>
-8000036c:	03154733          	div	a4,a0,a7
-80000370:	0ce6c863          	blt	a3,a4,80000440 <vx_spawn_tasks+0x110>
-80000374:	0ae7d863          	bge	a5,a4,80000424 <vx_spawn_tasks+0xf4>
-80000378:	fff68693          	addi	a3,a3,-1
-8000037c:	02e54333          	div	t1,a0,a4
-80000380:	00030893          	mv	a7,t1
-80000384:	00f69663          	bne	a3,a5,80000390 <vx_spawn_tasks+0x60>
-80000388:	02e56533          	rem	a0,a0,a4
-8000038c:	006508b3          	add	a7,a0,t1
-80000390:	0288c4b3          	div	s1,a7,s0
-80000394:	0288e933          	rem	s2,a7,s0
-80000398:	0b04ca63          	blt	s1,a6,8000044c <vx_spawn_tasks+0x11c>
-8000039c:	00100693          	li	a3,1
-800003a0:	0304c733          	div	a4,s1,a6
-800003a4:	00070663          	beqz	a4,800003b0 <vx_spawn_tasks+0x80>
-800003a8:	00070693          	mv	a3,a4
-800003ac:	0304e733          	rem	a4,s1,a6
-800003b0:	800029b7          	lui	s3,0x80002
-800003b4:	ddc98993          	addi	s3,s3,-548 # 80001ddc <__stack_top+0x81001ddc>
-800003b8:	00e12e23          	sw	a4,28(sp)
-800003bc:	00c10713          	addi	a4,sp,12
-800003c0:	00b12623          	sw	a1,12(sp)
-800003c4:	00c12823          	sw	a2,16(sp)
-800003c8:	00d12c23          	sw	a3,24(sp)
-800003cc:	02f30333          	mul	t1,t1,a5
-800003d0:	00279793          	slli	a5,a5,0x2
-800003d4:	00f987b3          	add	a5,s3,a5
-800003d8:	00e7a023          	sw	a4,0(a5)
-800003dc:	00612a23          	sw	t1,20(sp)
-800003e0:	06904c63          	bgtz	s1,80000458 <vx_spawn_tasks+0x128>
-800003e4:	04090063          	beqz	s2,80000424 <vx_spawn_tasks+0xf4>
-800003e8:	02848433          	mul	s0,s1,s0
-800003ec:	00812a23          	sw	s0,20(sp)
-800003f0:	0009006b          	0x9006b
-800003f4:	cc5027f3          	csrr	a5,0xcc5
-800003f8:	cc202573          	csrr	a0,0xcc2
-800003fc:	00279793          	slli	a5,a5,0x2
-80000400:	00f989b3          	add	s3,s3,a5
-80000404:	0009a783          	lw	a5,0(s3)
-80000408:	0087a683          	lw	a3,8(a5)
-8000040c:	0007a703          	lw	a4,0(a5)
-80000410:	0047a583          	lw	a1,4(a5)
-80000414:	00d50533          	add	a0,a0,a3
-80000418:	000700e7          	jalr	a4
-8000041c:	00100793          	li	a5,1
-80000420:	0007806b          	0x7806b
-80000424:	03c12083          	lw	ra,60(sp)
-80000428:	03812403          	lw	s0,56(sp)
-8000042c:	03412483          	lw	s1,52(sp)
-80000430:	03012903          	lw	s2,48(sp)
-80000434:	02c12983          	lw	s3,44(sp)
-80000438:	04010113          	addi	sp,sp,64
-8000043c:	00008067          	ret
-80000440:	00068713          	mv	a4,a3
-80000444:	f2e7cae3          	blt	a5,a4,80000378 <vx_spawn_tasks+0x48>
-80000448:	fddff06f          	j	80000424 <vx_spawn_tasks+0xf4>
-8000044c:	00000713          	li	a4,0
-80000450:	00100693          	li	a3,1
-80000454:	f5dff06f          	j	800003b0 <vx_spawn_tasks+0x80>
-80000458:	00048713          	mv	a4,s1
-8000045c:	00985463          	bge	a6,s1,80000464 <vx_spawn_tasks+0x134>
-80000460:	00080713          	mv	a4,a6
-80000464:	800007b7          	lui	a5,0x80000
-80000468:	27078793          	addi	a5,a5,624 # 80000270 <__stack_top+0x81000270>
-8000046c:	00f7106b          	0xf7106b
-80000470:	e01ff0ef          	jal	ra,80000270 <spawn_tasks_callback>
-80000474:	f71ff06f          	j	800003e4 <vx_spawn_tasks+0xb4>
+80000334 <vx_spawn_tasks>:
+80000334:	fc010113          	addi	sp,sp,-64
+80000338:	02112e23          	sw	ra,60(sp)
+8000033c:	02812c23          	sw	s0,56(sp)
+80000340:	02912a23          	sw	s1,52(sp)
+80000344:	03212823          	sw	s2,48(sp)
+80000348:	03312623          	sw	s3,44(sp)
+8000034c:	fc2026f3          	csrr	a3,0xfc2
+80000350:	fc102873          	csrr	a6,0xfc1
+80000354:	fc002473          	csrr	s0,0xfc0
+80000358:	cc5027f3          	csrr	a5,0xcc5
+8000035c:	01f00713          	li	a4,31
+80000360:	0cf74463          	blt	a4,a5,80000428 <vx_spawn_tasks+0xf4>
+80000364:	030408b3          	mul	a7,s0,a6
+80000368:	00100713          	li	a4,1
+8000036c:	00a8d463          	bge	a7,a0,80000374 <vx_spawn_tasks+0x40>
+80000370:	03154733          	div	a4,a0,a7
+80000374:	0ce6c863          	blt	a3,a4,80000444 <vx_spawn_tasks+0x110>
+80000378:	0ae7d863          	bge	a5,a4,80000428 <vx_spawn_tasks+0xf4>
+8000037c:	fff68693          	addi	a3,a3,-1
+80000380:	02e54333          	div	t1,a0,a4
+80000384:	00030893          	mv	a7,t1
+80000388:	00f69663          	bne	a3,a5,80000394 <vx_spawn_tasks+0x60>
+8000038c:	02e56533          	rem	a0,a0,a4
+80000390:	006508b3          	add	a7,a0,t1
+80000394:	0288c4b3          	div	s1,a7,s0
+80000398:	0288e933          	rem	s2,a7,s0
+8000039c:	0b04ca63          	blt	s1,a6,80000450 <vx_spawn_tasks+0x11c>
+800003a0:	00100693          	li	a3,1
+800003a4:	0304c733          	div	a4,s1,a6
+800003a8:	00070663          	beqz	a4,800003b4 <vx_spawn_tasks+0x80>
+800003ac:	00070693          	mv	a3,a4
+800003b0:	0304e733          	rem	a4,s1,a6
+800003b4:	800029b7          	lui	s3,0x80002
+800003b8:	ddc98993          	addi	s3,s3,-548 # 80001ddc <__stack_top+0x81001ddc>
+800003bc:	00e12e23          	sw	a4,28(sp)
+800003c0:	00c10713          	addi	a4,sp,12
+800003c4:	00b12623          	sw	a1,12(sp)
+800003c8:	00c12823          	sw	a2,16(sp)
+800003cc:	00d12c23          	sw	a3,24(sp)
+800003d0:	02f30333          	mul	t1,t1,a5
+800003d4:	00279793          	slli	a5,a5,0x2
+800003d8:	00f987b3          	add	a5,s3,a5
+800003dc:	00e7a023          	sw	a4,0(a5)
+800003e0:	00612a23          	sw	t1,20(sp)
+800003e4:	06904c63          	bgtz	s1,8000045c <vx_spawn_tasks+0x128>
+800003e8:	04090063          	beqz	s2,80000428 <vx_spawn_tasks+0xf4>
+800003ec:	02848433          	mul	s0,s1,s0
+800003f0:	00812a23          	sw	s0,20(sp)
+800003f4:	0009006b          	0x9006b
+800003f8:	cc5027f3          	csrr	a5,0xcc5
+800003fc:	cc202573          	csrr	a0,0xcc2
+80000400:	00279793          	slli	a5,a5,0x2
+80000404:	00f989b3          	add	s3,s3,a5
+80000408:	0009a783          	lw	a5,0(s3)
+8000040c:	0087a683          	lw	a3,8(a5)
+80000410:	0007a703          	lw	a4,0(a5)
+80000414:	0047a583          	lw	a1,4(a5)
+80000418:	00d50533          	add	a0,a0,a3
+8000041c:	000700e7          	jalr	a4
+80000420:	00100793          	li	a5,1
+80000424:	0007806b          	0x7806b
+80000428:	03c12083          	lw	ra,60(sp)
+8000042c:	03812403          	lw	s0,56(sp)
+80000430:	03412483          	lw	s1,52(sp)
+80000434:	03012903          	lw	s2,48(sp)
+80000438:	02c12983          	lw	s3,44(sp)
+8000043c:	04010113          	addi	sp,sp,64
+80000440:	00008067          	ret
+80000444:	00068713          	mv	a4,a3
+80000448:	f2e7cae3          	blt	a5,a4,8000037c <vx_spawn_tasks+0x48>
+8000044c:	fddff06f          	j	80000428 <vx_spawn_tasks+0xf4>
+80000450:	00000713          	li	a4,0
+80000454:	00100693          	li	a3,1
+80000458:	f5dff06f          	j	800003b4 <vx_spawn_tasks+0x80>
+8000045c:	00048713          	mv	a4,s1
+80000460:	00985463          	bge	a6,s1,80000468 <vx_spawn_tasks+0x134>
+80000464:	00080713          	mv	a4,a6
+80000468:	800007b7          	lui	a5,0x80000
+8000046c:	27478793          	addi	a5,a5,628 # 80000274 <__stack_top+0x81000274>
+80000470:	00f7106b          	0xf7106b
+80000474:	e01ff0ef          	jal	ra,80000274 <spawn_tasks_callback>
+80000478:	f71ff06f          	j	800003e8 <vx_spawn_tasks+0xb4>
 
-80000478 <__clzsi2>:
-80000478:	000107b7          	lui	a5,0x10
-8000047c:	02f57a63          	bgeu	a0,a5,800004b0 <__clzsi2+0x38>
-80000480:	0ff00793          	li	a5,255
-80000484:	00a7b7b3          	sltu	a5,a5,a0
-80000488:	00379793          	slli	a5,a5,0x3
-8000048c:	80001737          	lui	a4,0x80001
-80000490:	02000693          	li	a3,32
-80000494:	40f686b3          	sub	a3,a3,a5
-80000498:	00f55533          	srl	a0,a0,a5
-8000049c:	8a070793          	addi	a5,a4,-1888 # 800008a0 <__stack_top+0x810008a0>
-800004a0:	00a78533          	add	a0,a5,a0
-800004a4:	00054503          	lbu	a0,0(a0)
-800004a8:	40a68533          	sub	a0,a3,a0
-800004ac:	00008067          	ret
-800004b0:	01000737          	lui	a4,0x1000
-800004b4:	01000793          	li	a5,16
-800004b8:	fce56ae3          	bltu	a0,a4,8000048c <__clzsi2+0x14>
-800004bc:	01800793          	li	a5,24
-800004c0:	fcdff06f          	j	8000048c <__clzsi2+0x14>
+8000047c <__clzsi2>:
+8000047c:	000107b7          	lui	a5,0x10
+80000480:	02f57a63          	bgeu	a0,a5,800004b4 <__clzsi2+0x38>
+80000484:	0ff00793          	li	a5,255
+80000488:	00a7b7b3          	sltu	a5,a5,a0
+8000048c:	00379793          	slli	a5,a5,0x3
+80000490:	80001737          	lui	a4,0x80001
+80000494:	02000693          	li	a3,32
+80000498:	40f686b3          	sub	a3,a3,a5
+8000049c:	00f55533          	srl	a0,a0,a5
+800004a0:	8a470793          	addi	a5,a4,-1884 # 800008a4 <__stack_top+0x810008a4>
+800004a4:	00a78533          	add	a0,a5,a0
+800004a8:	00054503          	lbu	a0,0(a0)
+800004ac:	40a68533          	sub	a0,a3,a0
+800004b0:	00008067          	ret
+800004b4:	01000737          	lui	a4,0x1000
+800004b8:	01000793          	li	a5,16
+800004bc:	fce56ae3          	bltu	a0,a4,80000490 <__clzsi2+0x14>
+800004c0:	01800793          	li	a5,24
+800004c4:	fcdff06f          	j	80000490 <__clzsi2+0x14>
 
-800004c4 <atexit>:
-800004c4:	00050593          	mv	a1,a0
-800004c8:	00000693          	li	a3,0
-800004cc:	00000613          	li	a2,0
-800004d0:	00000513          	li	a0,0
-800004d4:	20c0006f          	j	800006e0 <__register_exitproc>
+800004c8 <atexit>:
+800004c8:	00050593          	mv	a1,a0
+800004cc:	00000693          	li	a3,0
+800004d0:	00000613          	li	a2,0
+800004d4:	00000513          	li	a0,0
+800004d8:	20c0006f          	j	800006e4 <__register_exitproc>
 
-800004d8 <exit>:
-800004d8:	ff010113          	addi	sp,sp,-16
-800004dc:	00000593          	li	a1,0
-800004e0:	00812423          	sw	s0,8(sp)
-800004e4:	00112623          	sw	ra,12(sp)
-800004e8:	00050413          	mv	s0,a0
-800004ec:	290000ef          	jal	ra,8000077c <__call_exitprocs>
-800004f0:	800027b7          	lui	a5,0x80002
-800004f4:	dd87a503          	lw	a0,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
-800004f8:	03c52783          	lw	a5,60(a0)
-800004fc:	00078463          	beqz	a5,80000504 <exit+0x2c>
-80000500:	000780e7          	jalr	a5
-80000504:	00040513          	mv	a0,s0
-80000508:	d25ff0ef          	jal	ra,8000022c <_exit>
+800004dc <exit>:
+800004dc:	ff010113          	addi	sp,sp,-16
+800004e0:	00000593          	li	a1,0
+800004e4:	00812423          	sw	s0,8(sp)
+800004e8:	00112623          	sw	ra,12(sp)
+800004ec:	00050413          	mv	s0,a0
+800004f0:	290000ef          	jal	ra,80000780 <__call_exitprocs>
+800004f4:	800027b7          	lui	a5,0x80002
+800004f8:	dd87a503          	lw	a0,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
+800004fc:	03c52783          	lw	a5,60(a0)
+80000500:	00078463          	beqz	a5,80000508 <exit+0x2c>
+80000504:	000780e7          	jalr	a5
+80000508:	00040513          	mv	a0,s0
+8000050c:	d25ff0ef          	jal	ra,80000230 <_exit>
 
-8000050c <__libc_fini_array>:
-8000050c:	ff010113          	addi	sp,sp,-16
-80000510:	00812423          	sw	s0,8(sp)
-80000514:	800027b7          	lui	a5,0x80002
-80000518:	80002437          	lui	s0,0x80002
-8000051c:	9a440413          	addi	s0,s0,-1628 # 800019a4 <__stack_top+0x810019a4>
-80000520:	9a478793          	addi	a5,a5,-1628 # 800019a4 <__stack_top+0x810019a4>
-80000524:	408787b3          	sub	a5,a5,s0
-80000528:	00912223          	sw	s1,4(sp)
-8000052c:	00112623          	sw	ra,12(sp)
-80000530:	4027d493          	srai	s1,a5,0x2
-80000534:	02048063          	beqz	s1,80000554 <__libc_fini_array+0x48>
-80000538:	ffc78793          	addi	a5,a5,-4
-8000053c:	00878433          	add	s0,a5,s0
-80000540:	00042783          	lw	a5,0(s0)
-80000544:	fff48493          	addi	s1,s1,-1
-80000548:	ffc40413          	addi	s0,s0,-4
-8000054c:	000780e7          	jalr	a5
-80000550:	fe0498e3          	bnez	s1,80000540 <__libc_fini_array+0x34>
-80000554:	00c12083          	lw	ra,12(sp)
-80000558:	00812403          	lw	s0,8(sp)
-8000055c:	00412483          	lw	s1,4(sp)
-80000560:	01010113          	addi	sp,sp,16
-80000564:	00008067          	ret
+80000510 <__libc_fini_array>:
+80000510:	ff010113          	addi	sp,sp,-16
+80000514:	00812423          	sw	s0,8(sp)
+80000518:	800027b7          	lui	a5,0x80002
+8000051c:	80002437          	lui	s0,0x80002
+80000520:	9a840413          	addi	s0,s0,-1624 # 800019a8 <__stack_top+0x810019a8>
+80000524:	9a878793          	addi	a5,a5,-1624 # 800019a8 <__stack_top+0x810019a8>
+80000528:	408787b3          	sub	a5,a5,s0
+8000052c:	00912223          	sw	s1,4(sp)
+80000530:	00112623          	sw	ra,12(sp)
+80000534:	4027d493          	srai	s1,a5,0x2
+80000538:	02048063          	beqz	s1,80000558 <__libc_fini_array+0x48>
+8000053c:	ffc78793          	addi	a5,a5,-4
+80000540:	00878433          	add	s0,a5,s0
+80000544:	00042783          	lw	a5,0(s0)
+80000548:	fff48493          	addi	s1,s1,-1
+8000054c:	ffc40413          	addi	s0,s0,-4
+80000550:	000780e7          	jalr	a5
+80000554:	fe0498e3          	bnez	s1,80000544 <__libc_fini_array+0x34>
+80000558:	00c12083          	lw	ra,12(sp)
+8000055c:	00812403          	lw	s0,8(sp)
+80000560:	00412483          	lw	s1,4(sp)
+80000564:	01010113          	addi	sp,sp,16
+80000568:	00008067          	ret
 
-80000568 <__libc_init_array>:
-80000568:	ff010113          	addi	sp,sp,-16
-8000056c:	00812423          	sw	s0,8(sp)
-80000570:	01212023          	sw	s2,0(sp)
-80000574:	80002437          	lui	s0,0x80002
-80000578:	80002937          	lui	s2,0x80002
-8000057c:	9a040793          	addi	a5,s0,-1632 # 800019a0 <__stack_top+0x810019a0>
-80000580:	9a090913          	addi	s2,s2,-1632 # 800019a0 <__stack_top+0x810019a0>
-80000584:	40f90933          	sub	s2,s2,a5
-80000588:	00112623          	sw	ra,12(sp)
-8000058c:	00912223          	sw	s1,4(sp)
-80000590:	40295913          	srai	s2,s2,0x2
-80000594:	02090063          	beqz	s2,800005b4 <__libc_init_array+0x4c>
-80000598:	9a040413          	addi	s0,s0,-1632
-8000059c:	00000493          	li	s1,0
-800005a0:	00042783          	lw	a5,0(s0)
-800005a4:	00148493          	addi	s1,s1,1
-800005a8:	00440413          	addi	s0,s0,4
-800005ac:	000780e7          	jalr	a5
-800005b0:	fe9918e3          	bne	s2,s1,800005a0 <__libc_init_array+0x38>
-800005b4:	80002437          	lui	s0,0x80002
-800005b8:	80002937          	lui	s2,0x80002
-800005bc:	9a040793          	addi	a5,s0,-1632 # 800019a0 <__stack_top+0x810019a0>
-800005c0:	9a490913          	addi	s2,s2,-1628 # 800019a4 <__stack_top+0x810019a4>
-800005c4:	40f90933          	sub	s2,s2,a5
-800005c8:	40295913          	srai	s2,s2,0x2
-800005cc:	02090063          	beqz	s2,800005ec <__libc_init_array+0x84>
-800005d0:	9a040413          	addi	s0,s0,-1632
-800005d4:	00000493          	li	s1,0
-800005d8:	00042783          	lw	a5,0(s0)
-800005dc:	00148493          	addi	s1,s1,1
-800005e0:	00440413          	addi	s0,s0,4
-800005e4:	000780e7          	jalr	a5
-800005e8:	fe9918e3          	bne	s2,s1,800005d8 <__libc_init_array+0x70>
-800005ec:	00c12083          	lw	ra,12(sp)
-800005f0:	00812403          	lw	s0,8(sp)
-800005f4:	00412483          	lw	s1,4(sp)
-800005f8:	00012903          	lw	s2,0(sp)
-800005fc:	01010113          	addi	sp,sp,16
-80000600:	00008067          	ret
+8000056c <__libc_init_array>:
+8000056c:	ff010113          	addi	sp,sp,-16
+80000570:	00812423          	sw	s0,8(sp)
+80000574:	01212023          	sw	s2,0(sp)
+80000578:	80002437          	lui	s0,0x80002
+8000057c:	80002937          	lui	s2,0x80002
+80000580:	9a440793          	addi	a5,s0,-1628 # 800019a4 <__stack_top+0x810019a4>
+80000584:	9a490913          	addi	s2,s2,-1628 # 800019a4 <__stack_top+0x810019a4>
+80000588:	40f90933          	sub	s2,s2,a5
+8000058c:	00112623          	sw	ra,12(sp)
+80000590:	00912223          	sw	s1,4(sp)
+80000594:	40295913          	srai	s2,s2,0x2
+80000598:	02090063          	beqz	s2,800005b8 <__libc_init_array+0x4c>
+8000059c:	9a440413          	addi	s0,s0,-1628
+800005a0:	00000493          	li	s1,0
+800005a4:	00042783          	lw	a5,0(s0)
+800005a8:	00148493          	addi	s1,s1,1
+800005ac:	00440413          	addi	s0,s0,4
+800005b0:	000780e7          	jalr	a5
+800005b4:	fe9918e3          	bne	s2,s1,800005a4 <__libc_init_array+0x38>
+800005b8:	80002437          	lui	s0,0x80002
+800005bc:	80002937          	lui	s2,0x80002
+800005c0:	9a440793          	addi	a5,s0,-1628 # 800019a4 <__stack_top+0x810019a4>
+800005c4:	9a890913          	addi	s2,s2,-1624 # 800019a8 <__stack_top+0x810019a8>
+800005c8:	40f90933          	sub	s2,s2,a5
+800005cc:	40295913          	srai	s2,s2,0x2
+800005d0:	02090063          	beqz	s2,800005f0 <__libc_init_array+0x84>
+800005d4:	9a440413          	addi	s0,s0,-1628
+800005d8:	00000493          	li	s1,0
+800005dc:	00042783          	lw	a5,0(s0)
+800005e0:	00148493          	addi	s1,s1,1
+800005e4:	00440413          	addi	s0,s0,4
+800005e8:	000780e7          	jalr	a5
+800005ec:	fe9918e3          	bne	s2,s1,800005dc <__libc_init_array+0x70>
+800005f0:	00c12083          	lw	ra,12(sp)
+800005f4:	00812403          	lw	s0,8(sp)
+800005f8:	00412483          	lw	s1,4(sp)
+800005fc:	00012903          	lw	s2,0(sp)
+80000600:	01010113          	addi	sp,sp,16
+80000604:	00008067          	ret
 
-80000604 <memset>:
-80000604:	00f00313          	li	t1,15
-80000608:	00050713          	mv	a4,a0
-8000060c:	02c37e63          	bgeu	t1,a2,80000648 <memset+0x44>
-80000610:	00f77793          	andi	a5,a4,15
-80000614:	0a079063          	bnez	a5,800006b4 <memset+0xb0>
-80000618:	08059263          	bnez	a1,8000069c <memset+0x98>
-8000061c:	ff067693          	andi	a3,a2,-16
-80000620:	00f67613          	andi	a2,a2,15
-80000624:	00e686b3          	add	a3,a3,a4
-80000628:	00b72023          	sw	a1,0(a4) # 1000000 <__stack_size+0xfffc00>
-8000062c:	00b72223          	sw	a1,4(a4)
-80000630:	00b72423          	sw	a1,8(a4)
-80000634:	00b72623          	sw	a1,12(a4)
-80000638:	01070713          	addi	a4,a4,16
-8000063c:	fed766e3          	bltu	a4,a3,80000628 <memset+0x24>
-80000640:	00061463          	bnez	a2,80000648 <memset+0x44>
-80000644:	00008067          	ret
-80000648:	40c306b3          	sub	a3,t1,a2
-8000064c:	00269693          	slli	a3,a3,0x2
-80000650:	00000297          	auipc	t0,0x0
-80000654:	005686b3          	add	a3,a3,t0
-80000658:	00c68067          	jr	12(a3)
-8000065c:	00b70723          	sb	a1,14(a4)
-80000660:	00b706a3          	sb	a1,13(a4)
-80000664:	00b70623          	sb	a1,12(a4)
-80000668:	00b705a3          	sb	a1,11(a4)
-8000066c:	00b70523          	sb	a1,10(a4)
-80000670:	00b704a3          	sb	a1,9(a4)
-80000674:	00b70423          	sb	a1,8(a4)
-80000678:	00b703a3          	sb	a1,7(a4)
-8000067c:	00b70323          	sb	a1,6(a4)
-80000680:	00b702a3          	sb	a1,5(a4)
-80000684:	00b70223          	sb	a1,4(a4)
-80000688:	00b701a3          	sb	a1,3(a4)
-8000068c:	00b70123          	sb	a1,2(a4)
-80000690:	00b700a3          	sb	a1,1(a4)
-80000694:	00b70023          	sb	a1,0(a4)
-80000698:	00008067          	ret
-8000069c:	0ff5f593          	andi	a1,a1,255
-800006a0:	00859693          	slli	a3,a1,0x8
-800006a4:	00d5e5b3          	or	a1,a1,a3
-800006a8:	01059693          	slli	a3,a1,0x10
-800006ac:	00d5e5b3          	or	a1,a1,a3
-800006b0:	f6dff06f          	j	8000061c <memset+0x18>
-800006b4:	00279693          	slli	a3,a5,0x2
-800006b8:	00000297          	auipc	t0,0x0
-800006bc:	005686b3          	add	a3,a3,t0
-800006c0:	00008293          	mv	t0,ra
-800006c4:	fa0680e7          	jalr	-96(a3)
-800006c8:	00028093          	mv	ra,t0
-800006cc:	ff078793          	addi	a5,a5,-16
-800006d0:	40f70733          	sub	a4,a4,a5
-800006d4:	00f60633          	add	a2,a2,a5
-800006d8:	f6c378e3          	bgeu	t1,a2,80000648 <memset+0x44>
-800006dc:	f3dff06f          	j	80000618 <memset+0x14>
+80000608 <memset>:
+80000608:	00f00313          	li	t1,15
+8000060c:	00050713          	mv	a4,a0
+80000610:	02c37e63          	bgeu	t1,a2,8000064c <memset+0x44>
+80000614:	00f77793          	andi	a5,a4,15
+80000618:	0a079063          	bnez	a5,800006b8 <memset+0xb0>
+8000061c:	08059263          	bnez	a1,800006a0 <memset+0x98>
+80000620:	ff067693          	andi	a3,a2,-16
+80000624:	00f67613          	andi	a2,a2,15
+80000628:	00e686b3          	add	a3,a3,a4
+8000062c:	00b72023          	sw	a1,0(a4) # 1000000 <__stack_size+0xfffc00>
+80000630:	00b72223          	sw	a1,4(a4)
+80000634:	00b72423          	sw	a1,8(a4)
+80000638:	00b72623          	sw	a1,12(a4)
+8000063c:	01070713          	addi	a4,a4,16
+80000640:	fed766e3          	bltu	a4,a3,8000062c <memset+0x24>
+80000644:	00061463          	bnez	a2,8000064c <memset+0x44>
+80000648:	00008067          	ret
+8000064c:	40c306b3          	sub	a3,t1,a2
+80000650:	00269693          	slli	a3,a3,0x2
+80000654:	00000297          	auipc	t0,0x0
+80000658:	005686b3          	add	a3,a3,t0
+8000065c:	00c68067          	jr	12(a3)
+80000660:	00b70723          	sb	a1,14(a4)
+80000664:	00b706a3          	sb	a1,13(a4)
+80000668:	00b70623          	sb	a1,12(a4)
+8000066c:	00b705a3          	sb	a1,11(a4)
+80000670:	00b70523          	sb	a1,10(a4)
+80000674:	00b704a3          	sb	a1,9(a4)
+80000678:	00b70423          	sb	a1,8(a4)
+8000067c:	00b703a3          	sb	a1,7(a4)
+80000680:	00b70323          	sb	a1,6(a4)
+80000684:	00b702a3          	sb	a1,5(a4)
+80000688:	00b70223          	sb	a1,4(a4)
+8000068c:	00b701a3          	sb	a1,3(a4)
+80000690:	00b70123          	sb	a1,2(a4)
+80000694:	00b700a3          	sb	a1,1(a4)
+80000698:	00b70023          	sb	a1,0(a4)
+8000069c:	00008067          	ret
+800006a0:	0ff5f593          	andi	a1,a1,255
+800006a4:	00859693          	slli	a3,a1,0x8
+800006a8:	00d5e5b3          	or	a1,a1,a3
+800006ac:	01059693          	slli	a3,a1,0x10
+800006b0:	00d5e5b3          	or	a1,a1,a3
+800006b4:	f6dff06f          	j	80000620 <memset+0x18>
+800006b8:	00279693          	slli	a3,a5,0x2
+800006bc:	00000297          	auipc	t0,0x0
+800006c0:	005686b3          	add	a3,a3,t0
+800006c4:	00008293          	mv	t0,ra
+800006c8:	fa0680e7          	jalr	-96(a3)
+800006cc:	00028093          	mv	ra,t0
+800006d0:	ff078793          	addi	a5,a5,-16
+800006d4:	40f70733          	sub	a4,a4,a5
+800006d8:	00f60633          	add	a2,a2,a5
+800006dc:	f6c378e3          	bgeu	t1,a2,8000064c <memset+0x44>
+800006e0:	f3dff06f          	j	8000061c <memset+0x14>
 
-800006e0 <__register_exitproc>:
-800006e0:	800027b7          	lui	a5,0x80002
-800006e4:	dd87a703          	lw	a4,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
-800006e8:	14872783          	lw	a5,328(a4)
-800006ec:	04078c63          	beqz	a5,80000744 <__register_exitproc+0x64>
-800006f0:	0047a703          	lw	a4,4(a5)
-800006f4:	01f00813          	li	a6,31
-800006f8:	06e84e63          	blt	a6,a4,80000774 <__register_exitproc+0x94>
-800006fc:	00271813          	slli	a6,a4,0x2
-80000700:	02050663          	beqz	a0,8000072c <__register_exitproc+0x4c>
-80000704:	01078333          	add	t1,a5,a6
-80000708:	08c32423          	sw	a2,136(t1)
-8000070c:	1887a883          	lw	a7,392(a5)
-80000710:	00100613          	li	a2,1
-80000714:	00e61633          	sll	a2,a2,a4
-80000718:	00c8e8b3          	or	a7,a7,a2
-8000071c:	1917a423          	sw	a7,392(a5)
-80000720:	10d32423          	sw	a3,264(t1)
-80000724:	00200693          	li	a3,2
-80000728:	02d50463          	beq	a0,a3,80000750 <__register_exitproc+0x70>
-8000072c:	00170713          	addi	a4,a4,1
-80000730:	00e7a223          	sw	a4,4(a5)
-80000734:	010787b3          	add	a5,a5,a6
-80000738:	00b7a423          	sw	a1,8(a5)
-8000073c:	00000513          	li	a0,0
-80000740:	00008067          	ret
-80000744:	14c70793          	addi	a5,a4,332
-80000748:	14f72423          	sw	a5,328(a4)
-8000074c:	fa5ff06f          	j	800006f0 <__register_exitproc+0x10>
-80000750:	18c7a683          	lw	a3,396(a5)
-80000754:	00170713          	addi	a4,a4,1
-80000758:	00e7a223          	sw	a4,4(a5)
-8000075c:	00c6e633          	or	a2,a3,a2
-80000760:	18c7a623          	sw	a2,396(a5)
-80000764:	010787b3          	add	a5,a5,a6
-80000768:	00b7a423          	sw	a1,8(a5)
-8000076c:	00000513          	li	a0,0
-80000770:	00008067          	ret
-80000774:	fff00513          	li	a0,-1
-80000778:	00008067          	ret
+800006e4 <__register_exitproc>:
+800006e4:	800027b7          	lui	a5,0x80002
+800006e8:	dd87a703          	lw	a4,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
+800006ec:	14872783          	lw	a5,328(a4)
+800006f0:	04078c63          	beqz	a5,80000748 <__register_exitproc+0x64>
+800006f4:	0047a703          	lw	a4,4(a5)
+800006f8:	01f00813          	li	a6,31
+800006fc:	06e84e63          	blt	a6,a4,80000778 <__register_exitproc+0x94>
+80000700:	00271813          	slli	a6,a4,0x2
+80000704:	02050663          	beqz	a0,80000730 <__register_exitproc+0x4c>
+80000708:	01078333          	add	t1,a5,a6
+8000070c:	08c32423          	sw	a2,136(t1)
+80000710:	1887a883          	lw	a7,392(a5)
+80000714:	00100613          	li	a2,1
+80000718:	00e61633          	sll	a2,a2,a4
+8000071c:	00c8e8b3          	or	a7,a7,a2
+80000720:	1917a423          	sw	a7,392(a5)
+80000724:	10d32423          	sw	a3,264(t1)
+80000728:	00200693          	li	a3,2
+8000072c:	02d50463          	beq	a0,a3,80000754 <__register_exitproc+0x70>
+80000730:	00170713          	addi	a4,a4,1
+80000734:	00e7a223          	sw	a4,4(a5)
+80000738:	010787b3          	add	a5,a5,a6
+8000073c:	00b7a423          	sw	a1,8(a5)
+80000740:	00000513          	li	a0,0
+80000744:	00008067          	ret
+80000748:	14c70793          	addi	a5,a4,332
+8000074c:	14f72423          	sw	a5,328(a4)
+80000750:	fa5ff06f          	j	800006f4 <__register_exitproc+0x10>
+80000754:	18c7a683          	lw	a3,396(a5)
+80000758:	00170713          	addi	a4,a4,1
+8000075c:	00e7a223          	sw	a4,4(a5)
+80000760:	00c6e633          	or	a2,a3,a2
+80000764:	18c7a623          	sw	a2,396(a5)
+80000768:	010787b3          	add	a5,a5,a6
+8000076c:	00b7a423          	sw	a1,8(a5)
+80000770:	00000513          	li	a0,0
+80000774:	00008067          	ret
+80000778:	fff00513          	li	a0,-1
+8000077c:	00008067          	ret
 
-8000077c <__call_exitprocs>:
-8000077c:	fd010113          	addi	sp,sp,-48
-80000780:	800027b7          	lui	a5,0x80002
-80000784:	01412c23          	sw	s4,24(sp)
-80000788:	dd87aa03          	lw	s4,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
-8000078c:	03212023          	sw	s2,32(sp)
-80000790:	02112623          	sw	ra,44(sp)
-80000794:	148a2903          	lw	s2,328(s4)
-80000798:	02812423          	sw	s0,40(sp)
-8000079c:	02912223          	sw	s1,36(sp)
-800007a0:	01312e23          	sw	s3,28(sp)
-800007a4:	01512a23          	sw	s5,20(sp)
-800007a8:	01612823          	sw	s6,16(sp)
-800007ac:	01712623          	sw	s7,12(sp)
-800007b0:	01812423          	sw	s8,8(sp)
-800007b4:	04090063          	beqz	s2,800007f4 <__call_exitprocs+0x78>
-800007b8:	00050b13          	mv	s6,a0
-800007bc:	00058b93          	mv	s7,a1
-800007c0:	00100a93          	li	s5,1
-800007c4:	fff00993          	li	s3,-1
-800007c8:	00492483          	lw	s1,4(s2)
-800007cc:	fff48413          	addi	s0,s1,-1
-800007d0:	02044263          	bltz	s0,800007f4 <__call_exitprocs+0x78>
-800007d4:	00249493          	slli	s1,s1,0x2
-800007d8:	009904b3          	add	s1,s2,s1
-800007dc:	040b8463          	beqz	s7,80000824 <__call_exitprocs+0xa8>
-800007e0:	1044a783          	lw	a5,260(s1)
-800007e4:	05778063          	beq	a5,s7,80000824 <__call_exitprocs+0xa8>
-800007e8:	fff40413          	addi	s0,s0,-1
-800007ec:	ffc48493          	addi	s1,s1,-4
-800007f0:	ff3416e3          	bne	s0,s3,800007dc <__call_exitprocs+0x60>
-800007f4:	02c12083          	lw	ra,44(sp)
-800007f8:	02812403          	lw	s0,40(sp)
-800007fc:	02412483          	lw	s1,36(sp)
-80000800:	02012903          	lw	s2,32(sp)
-80000804:	01c12983          	lw	s3,28(sp)
-80000808:	01812a03          	lw	s4,24(sp)
-8000080c:	01412a83          	lw	s5,20(sp)
-80000810:	01012b03          	lw	s6,16(sp)
-80000814:	00c12b83          	lw	s7,12(sp)
-80000818:	00812c03          	lw	s8,8(sp)
-8000081c:	03010113          	addi	sp,sp,48
-80000820:	00008067          	ret
-80000824:	00492783          	lw	a5,4(s2)
-80000828:	0044a683          	lw	a3,4(s1)
-8000082c:	fff78793          	addi	a5,a5,-1
-80000830:	04878e63          	beq	a5,s0,8000088c <__call_exitprocs+0x110>
-80000834:	0004a223          	sw	zero,4(s1)
-80000838:	fa0688e3          	beqz	a3,800007e8 <__call_exitprocs+0x6c>
-8000083c:	18892783          	lw	a5,392(s2)
-80000840:	008a9733          	sll	a4,s5,s0
-80000844:	00492c03          	lw	s8,4(s2)
-80000848:	00f777b3          	and	a5,a4,a5
-8000084c:	02079263          	bnez	a5,80000870 <__call_exitprocs+0xf4>
-80000850:	000680e7          	jalr	a3
-80000854:	00492703          	lw	a4,4(s2)
-80000858:	148a2783          	lw	a5,328(s4)
-8000085c:	01871463          	bne	a4,s8,80000864 <__call_exitprocs+0xe8>
-80000860:	f8f904e3          	beq	s2,a5,800007e8 <__call_exitprocs+0x6c>
-80000864:	f80788e3          	beqz	a5,800007f4 <__call_exitprocs+0x78>
-80000868:	00078913          	mv	s2,a5
-8000086c:	f5dff06f          	j	800007c8 <__call_exitprocs+0x4c>
-80000870:	18c92783          	lw	a5,396(s2)
-80000874:	0844a583          	lw	a1,132(s1)
-80000878:	00f77733          	and	a4,a4,a5
-8000087c:	00071c63          	bnez	a4,80000894 <__call_exitprocs+0x118>
-80000880:	000b0513          	mv	a0,s6
-80000884:	000680e7          	jalr	a3
-80000888:	fcdff06f          	j	80000854 <__call_exitprocs+0xd8>
-8000088c:	00892223          	sw	s0,4(s2)
-80000890:	fa9ff06f          	j	80000838 <__call_exitprocs+0xbc>
-80000894:	00058513          	mv	a0,a1
-80000898:	000680e7          	jalr	a3
-8000089c:	fb9ff06f          	j	80000854 <__call_exitprocs+0xd8>
+80000780 <__call_exitprocs>:
+80000780:	fd010113          	addi	sp,sp,-48
+80000784:	800027b7          	lui	a5,0x80002
+80000788:	01412c23          	sw	s4,24(sp)
+8000078c:	dd87aa03          	lw	s4,-552(a5) # 80001dd8 <__stack_top+0x81001dd8>
+80000790:	03212023          	sw	s2,32(sp)
+80000794:	02112623          	sw	ra,44(sp)
+80000798:	148a2903          	lw	s2,328(s4)
+8000079c:	02812423          	sw	s0,40(sp)
+800007a0:	02912223          	sw	s1,36(sp)
+800007a4:	01312e23          	sw	s3,28(sp)
+800007a8:	01512a23          	sw	s5,20(sp)
+800007ac:	01612823          	sw	s6,16(sp)
+800007b0:	01712623          	sw	s7,12(sp)
+800007b4:	01812423          	sw	s8,8(sp)
+800007b8:	04090063          	beqz	s2,800007f8 <__call_exitprocs+0x78>
+800007bc:	00050b13          	mv	s6,a0
+800007c0:	00058b93          	mv	s7,a1
+800007c4:	00100a93          	li	s5,1
+800007c8:	fff00993          	li	s3,-1
+800007cc:	00492483          	lw	s1,4(s2)
+800007d0:	fff48413          	addi	s0,s1,-1
+800007d4:	02044263          	bltz	s0,800007f8 <__call_exitprocs+0x78>
+800007d8:	00249493          	slli	s1,s1,0x2
+800007dc:	009904b3          	add	s1,s2,s1
+800007e0:	040b8463          	beqz	s7,80000828 <__call_exitprocs+0xa8>
+800007e4:	1044a783          	lw	a5,260(s1)
+800007e8:	05778063          	beq	a5,s7,80000828 <__call_exitprocs+0xa8>
+800007ec:	fff40413          	addi	s0,s0,-1
+800007f0:	ffc48493          	addi	s1,s1,-4
+800007f4:	ff3416e3          	bne	s0,s3,800007e0 <__call_exitprocs+0x60>
+800007f8:	02c12083          	lw	ra,44(sp)
+800007fc:	02812403          	lw	s0,40(sp)
+80000800:	02412483          	lw	s1,36(sp)
+80000804:	02012903          	lw	s2,32(sp)
+80000808:	01c12983          	lw	s3,28(sp)
+8000080c:	01812a03          	lw	s4,24(sp)
+80000810:	01412a83          	lw	s5,20(sp)
+80000814:	01012b03          	lw	s6,16(sp)
+80000818:	00c12b83          	lw	s7,12(sp)
+8000081c:	00812c03          	lw	s8,8(sp)
+80000820:	03010113          	addi	sp,sp,48
+80000824:	00008067          	ret
+80000828:	00492783          	lw	a5,4(s2)
+8000082c:	0044a683          	lw	a3,4(s1)
+80000830:	fff78793          	addi	a5,a5,-1
+80000834:	04878e63          	beq	a5,s0,80000890 <__call_exitprocs+0x110>
+80000838:	0004a223          	sw	zero,4(s1)
+8000083c:	fa0688e3          	beqz	a3,800007ec <__call_exitprocs+0x6c>
+80000840:	18892783          	lw	a5,392(s2)
+80000844:	008a9733          	sll	a4,s5,s0
+80000848:	00492c03          	lw	s8,4(s2)
+8000084c:	00f777b3          	and	a5,a4,a5
+80000850:	02079263          	bnez	a5,80000874 <__call_exitprocs+0xf4>
+80000854:	000680e7          	jalr	a3
+80000858:	00492703          	lw	a4,4(s2)
+8000085c:	148a2783          	lw	a5,328(s4)
+80000860:	01871463          	bne	a4,s8,80000868 <__call_exitprocs+0xe8>
+80000864:	f8f904e3          	beq	s2,a5,800007ec <__call_exitprocs+0x6c>
+80000868:	f80788e3          	beqz	a5,800007f8 <__call_exitprocs+0x78>
+8000086c:	00078913          	mv	s2,a5
+80000870:	f5dff06f          	j	800007cc <__call_exitprocs+0x4c>
+80000874:	18c92783          	lw	a5,396(s2)
+80000878:	0844a583          	lw	a1,132(s1)
+8000087c:	00f77733          	and	a4,a4,a5
+80000880:	00071c63          	bnez	a4,80000898 <__call_exitprocs+0x118>
+80000884:	000b0513          	mv	a0,s6
+80000888:	000680e7          	jalr	a3
+8000088c:	fcdff06f          	j	80000858 <__call_exitprocs+0xd8>
+80000890:	00892223          	sw	s0,4(s2)
+80000894:	fa9ff06f          	j	8000083c <__call_exitprocs+0xbc>
+80000898:	00058513          	mv	a0,a1
+8000089c:	000680e7          	jalr	a3
+800008a0:	fb9ff06f          	j	80000858 <__call_exitprocs+0xd8>
 
 Disassembly of section .rodata:
 
-800008a0 <__clz_tab>:
-800008a0:	0100                	addi	s0,sp,128
-800008a2:	0202                	c.slli64	tp
-800008a4:	03030303          	lb	t1,48(t1)
-800008a8:	0404                	addi	s1,sp,512
-800008aa:	0404                	addi	s1,sp,512
+800008a4 <__clz_tab>:
+800008a4:	0100                	addi	s0,sp,128
+800008a6:	0202                	c.slli64	tp
+800008a8:	03030303          	lb	t1,48(t1)
 800008ac:	0404                	addi	s1,sp,512
 800008ae:	0404                	addi	s1,sp,512
-800008b0:	0505                	addi	a0,a0,1
-800008b2:	0505                	addi	a0,a0,1
+800008b0:	0404                	addi	s1,sp,512
+800008b2:	0404                	addi	s1,sp,512
 800008b4:	0505                	addi	a0,a0,1
 800008b6:	0505                	addi	a0,a0,1
 800008b8:	0505                	addi	a0,a0,1
 800008ba:	0505                	addi	a0,a0,1
 800008bc:	0505                	addi	a0,a0,1
 800008be:	0505                	addi	a0,a0,1
-800008c0:	0606                	slli	a2,a2,0x1
-800008c2:	0606                	slli	a2,a2,0x1
+800008c0:	0505                	addi	a0,a0,1
+800008c2:	0505                	addi	a0,a0,1
 800008c4:	0606                	slli	a2,a2,0x1
 800008c6:	0606                	slli	a2,a2,0x1
 800008c8:	0606                	slli	a2,a2,0x1
@@ -626,7 +625,8 @@ Disassembly of section .rodata:
 800008da:	0606                	slli	a2,a2,0x1
 800008dc:	0606                	slli	a2,a2,0x1
 800008de:	0606                	slli	a2,a2,0x1
-800008e0:	07070707          	0x7070707
+800008e0:	0606                	slli	a2,a2,0x1
+800008e2:	0606                	slli	a2,a2,0x1
 800008e4:	07070707          	0x7070707
 800008e8:	07070707          	0x7070707
 800008ec:	07070707          	0x7070707
@@ -642,8 +642,7 @@ Disassembly of section .rodata:
 80000914:	07070707          	0x7070707
 80000918:	07070707          	0x7070707
 8000091c:	07070707          	0x7070707
-80000920:	0808                	addi	a0,sp,16
-80000922:	0808                	addi	a0,sp,16
+80000920:	07070707          	0x7070707
 80000924:	0808                	addi	a0,sp,16
 80000926:	0808                	addi	a0,sp,16
 80000928:	0808                	addi	a0,sp,16
@@ -706,12 +705,14 @@ Disassembly of section .rodata:
 8000099a:	0808                	addi	a0,sp,16
 8000099c:	0808                	addi	a0,sp,16
 8000099e:	0808                	addi	a0,sp,16
+800009a0:	0808                	addi	a0,sp,16
+800009a2:	0808                	addi	a0,sp,16
 
 Disassembly of section .init_array:
 
-800019a0 <__init_array_start>:
-800019a0:	0174                	addi	a3,sp,140
-800019a2:	8000                	0x8000
+800019a4 <__init_array_start>:
+800019a4:	0174                	addi	a3,sp,140
+800019a6:	8000                	0x8000
 
 Disassembly of section .data:
 
@@ -796,7 +797,7 @@ Disassembly of section .debug_aranges:
    a:	0004                	0x4
    c:	0000                	unimp
    e:	0000                	unimp
-  10:	0478                	addi	a4,sp,524
+  10:	047c                	addi	a5,sp,524
   12:	8000                	0x8000
   14:	004c                	addi	a1,sp,4
 	...
@@ -822,7 +823,7 @@ Disassembly of section .debug_info:
       12:	0004                	0x4
       14:	5900                	lw	s0,48(a0)
       16:	0006                	c.slli	zero,0x1
-      18:	7800                	flw	fs0,48(s0)
+      18:	7c00                	flw	fs0,56(s0)
       1a:	0004                	0x4
       1c:	4c80                	lw	s0,24(s1)
       1e:	0000                	unimp
@@ -2070,7 +2071,7 @@ Disassembly of section .debug_info:
      b80:	02c2                	slli	t0,t0,0x10
      b82:	2501                	jal	1182 <__stack_size+0xd82>
      b84:	0000                	unimp
-     b86:	7800                	flw	fs0,48(s0)
+     b86:	7c00                	flw	fs0,56(s0)
      b88:	0004                	0x4
      b8a:	4c80                	lw	s0,24(s1)
      b8c:	0000                	unimp
@@ -3315,7 +3316,7 @@ Disassembly of section .debug_info:
     1736:	b20d                	j	1058 <__stack_size+0xc58>
     1738:	0f02                	c.slli64	t5
     173a:	0305                	addi	t1,t1,1
-    173c:	08a0                	addi	s0,sp,88
+    173c:	08a4                	addi	s1,sp,88
     173e:	8000                	0x8000
 	...
 
@@ -3911,7 +3912,7 @@ Disassembly of section .debug_line:
  224:	0500                	addi	s0,sp,640
  226:	0001                	nop
  228:	0205                	addi	tp,tp,1
- 22a:	0478                	addi	a4,sp,524
+ 22a:	047c                	addi	a5,sp,524
  22c:	8000                	0x8000
  22e:	0105c203          	lbu	tp,16(a1)
  232:	0305                	addi	t1,t1,1
@@ -4191,7 +4192,7 @@ Disassembly of section .debug_frame:
   12:	0000                	unimp
   14:	0000                	unimp
   16:	0000                	unimp
-  18:	0478                	addi	a4,sp,524
+  18:	047c                	addi	a5,sp,524
   1a:	8000                	0x8000
   1c:	004c                	addi	a1,sp,4
 	...
diff --git a/driver/tests/tex_demo/kernel.elf b/driver/tests/tex_demo/kernel.elf
index 7cc7ac2c..05cb4770 100755
Binary files a/driver/tests/tex_demo/kernel.elf and b/driver/tests/tex_demo/kernel.elf differ
diff --git a/driver/tests/tex_demo/palette64.tga b/driver/tests/tex_demo/palette64.tga
index 3f4d9007..ea9bcd97 100644
Binary files a/driver/tests/tex_demo/palette64.tga and b/driver/tests/tex_demo/palette64.tga differ
diff --git a/driver/tests/tex_demo/utils.cpp b/driver/tests/tex_demo/utils.cpp
index 5bdfb2b7..342d49d5 100644
--- a/driver/tests/tex_demo/utils.cpp
+++ b/driver/tests/tex_demo/utils.cpp
@@ -81,7 +81,7 @@ int LoadTGA(const char *filename,
       default:
         std::abort();            
       }
-      *dst_bytes++ = color.toRGBA();
+      *dst_bytes++ = color;
     }
     break;
   }
@@ -108,6 +108,11 @@ int SaveTGA(const char *filename,
     return -1;
   }
 
+  if (bpp < 2 || bpp > 4) {        
+    std::cerr << "unsupported pixel stride: " << bpp << "!" << std::endl;
+    return -1;
+  }
+
   tga_header_t header;
   header.idlength = 0;
   header.colormaptype = 0; // no palette
@@ -131,20 +136,7 @@ int SaveTGA(const char *filename,
   for (uint32_t y = 0; y < height; ++y) {
     const uint8_t* pixel_row = pixel_bytes;
     for (uint32_t x = 0; x < width; ++x) {
-      // swap R/B color channels
-      if (bpp == 4) {
-        ofs.write((const char*)pixel_row + 2, 1);
-        ofs.write((const char*)pixel_row + 1, 1);
-        ofs.write((const char*)pixel_row + 0, 1);
-        ofs.write((const char*)pixel_row + 3, 1);
-      } else if (bpp == 3) {
-        ofs.write((const char*)pixel_row + 2, 1);
-        ofs.write((const char*)pixel_row + 1, 1);
-        ofs.write((const char*)pixel_row + 0, 1);
-      } else{
-        std::cerr << "unsupported TGA bitsperpixel!" << std::endl;
-        return -1;
-      }
+      ofs.write((const char*)pixel_row, bpp);      
       pixel_row += bpp;
     }
     pixel_bytes -= pitch;