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support SIGSEGV(page fault) and SIGILL(general protection error)

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This commit is contained in:
Tomoki Shirasawa
2013-07-26 11:53:00 +09:00
parent b6d25861e5
commit 221f2c0517
5 changed files with 163 additions and 49 deletions
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81
arch/x86/kernel/syscall.c
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@@ -6,6 +6,10 @@
#include <ihk/debug.h>
#include <cls.h>
#include <syscall.h>
#include <process.h>
#include <string.h>
void terminate(int, int, ihk_mc_user_context_t *);
//#define DEBUG_PRINT_SC
@@ -67,3 +71,80 @@ int obtain_clone_cpuid() {
ihk_mc_spinlock_unlock_noirq(&cpuid_head_lock);
return cpuid;
}
SYSCALL_DECLARE(rt_sigreturn)
{
struct process *proc = cpu_local_var(current);
char *kspbottom;
asm volatile ("movq %%gs:132,%0" : "=r" (kspbottom));
memcpy(kspbottom - 120, proc->sigstack, 120);
return proc->sigrc;
}
void
check_signal(unsigned long rc, unsigned long *regs)
{
struct process *proc = cpu_local_var(current);
struct k_sigaction *k;
int sig = proc->signal;
proc->signal = 0;
if(sig){
if(regs == NULL){ /* call from syscall */
asm volatile ("movq %%gs:132,%0" : "=r" (regs));
regs -= 16;
}
else{
rc = regs[9]; /* rax */
}
k = proc->sighandler->action + sig - 1;
if(k->sa.sa_handler == (void *)1){
return;
}
else if(k->sa.sa_handler){
unsigned long *usp; /* user stack */
long w;
usp = (void *)regs[14];
memcpy(proc->sigstack, regs, 128);
proc->sigrc = rc;
usp--;
*usp = (unsigned long)k->sa.sa_restorer;
w = 56 + 3;
asm volatile ("pushq %0" :: "r" (w));
asm volatile ("pushq %0" :: "r" (usp));
w = 1 << 9;
asm volatile ("pushq %0" :: "r" (w));
w = 48 + 3;
asm volatile ("pushq %0" :: "r" (w));
asm volatile ("pushq %0" :: "r" (k->sa.sa_handler));
asm volatile ("iretq");
}
else{
if(sig == SIGCHLD || sig == SIGURG)
return;
terminate(0, sig, (ihk_mc_user_context_t *)regs[14]);
}
}
}
void
sigsegv(unsigned long *regs)
{
struct process *proc = cpu_local_var(current);
proc->signal = SIGSEGV;
check_signal(0, regs);
}
void
sigill(unsigned long *regs)
{
struct process *proc = cpu_local_var(current);
proc->signal = SIGILL;
check_signal(0, regs);
}