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add shmobj for shared anonymous mappings

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This commit is contained in:
NAKAMURA Gou
2014-07-03 13:55:26 +09:00
parent 9057268f0e
commit 380fcbda73
5 changed files with 359 additions and 7 deletions
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26
kernel/syscall.c
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@@ -45,6 +45,7 @@
#include <mman.h>
#include <kmalloc.h>
#include <memobj.h>
#include <shm.h>
/* Headers taken from kitten LWK */
#include <lwk/stddef.h>
@@ -630,12 +631,13 @@ SYSCALL_DECLARE(mmap)
const int prot = ihk_mc_syscall_arg2(ctx);
const int flags = ihk_mc_syscall_arg3(ctx);
const int fd = ihk_mc_syscall_arg4(ctx);
const off_t off = ihk_mc_syscall_arg5(ctx);
const off_t off0 = ihk_mc_syscall_arg5(ctx);
struct process *proc = cpu_local_var(current);
struct vm_regions *region = &proc->vm->region;
intptr_t addr;
size_t len;
off_t off;
int error;
intptr_t npages;
int p2align;
@@ -646,10 +648,11 @@ SYSCALL_DECLARE(mmap)
int maxprot;
int denied;
int ro_vma_mapped = 0;
struct shmid_ds ads;
dkprintf("[%d]sys_mmap(%lx,%lx,%x,%x,%d,%lx)\n",
ihk_mc_get_processor_id(),
addr0, len0, prot, flags, fd, off);
addr0, len0, prot, flags, fd, off0);
/* check constants for flags */
if (1) {
@@ -681,9 +684,9 @@ SYSCALL_DECLARE(mmap)
|| ((region->user_end - len) < addr)
|| !(flags & (MAP_SHARED | MAP_PRIVATE))
|| ((flags & MAP_SHARED) && (flags & MAP_PRIVATE))
|| (off & (PAGE_SIZE - 1))) {
|| (off0 & (PAGE_SIZE - 1))) {
ekprintf("sys_mmap(%lx,%lx,%x,%x,%x,%lx):EINVAL\n",
addr0, len0, prot, flags, fd, off);
addr0, len0, prot, flags, fd, off0);
error = -EINVAL;
goto out2;
}
@@ -692,7 +695,7 @@ SYSCALL_DECLARE(mmap)
if ((flags & error_flags)
|| (flags & ~(supported_flags | ignored_flags))) {
ekprintf("sys_mmap(%lx,%lx,%x,%x,%x,%lx):unknown flags %x\n",
addr0, len0, prot, flags, fd, off,
addr0, len0, prot, flags, fd, off0,
(flags & ~(supported_flags | ignored_flags)));
error = -EINVAL;
goto out2;
@@ -754,8 +757,10 @@ SYSCALL_DECLARE(mmap)
}
phys = 0;
off = 0;
maxprot = PROT_READ | PROT_WRITE | PROT_EXEC;
if (!(flags & MAP_ANONYMOUS)) {
off = off0;
error = fileobj_create(fd, &memobj, &maxprot);
if (error) {
ekprintf("sys_mmap:fileobj_create failed. %d\n", error);
@@ -781,6 +786,15 @@ SYSCALL_DECLARE(mmap)
}
phys = virt_to_phys(p);
}
else if (flags & MAP_SHARED) {
memset(&ads, 0, sizeof(ads));
ads.shm_segsz = len;
error = shmobj_create(&ads, &memobj);
if (error) {
ekprintf("sys_mmap:shmobj_create failed. %d\n", error);
goto out;
}
}
if ((flags & MAP_PRIVATE) && (maxprot & PROT_READ)) {
maxprot |= PROT_WRITE;
@@ -844,7 +858,7 @@ out2:
}
dkprintf("[%d]sys_mmap(%lx,%lx,%x,%x,%d,%lx): %ld %lx\n",
ihk_mc_get_processor_id(),
addr0, len0, prot, flags, fd, off, error, addr);
addr0, len0, prot, flags, fd, off0, error, addr);
return (!error)? addr: error;
}