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support PTRACE_GETREGS

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This commit is contained in:
Tomoki Shirasawa
2014-10-10 13:58:42 +09:00
parent 4b46330624
commit fef946e5ff
2 changed files with 91 additions and 1 deletions
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39
arch/x86/kernel/syscall.c
View File

@@ -195,6 +195,45 @@ do_setpgid(int pid, int pgid)
}
}
void
pokeuser(struct process *proc, void *regs0)
{
struct x86_regs *regs = regs0;
if(regs == NULL){
asm("movq %%gs:132, %0" : "=r" (regs));
--regs;
}
asm("mov %0, %%db0" ::"r" (proc->userp->u_debugreg[0]));
asm("mov %0, %%db1" ::"r" (proc->userp->u_debugreg[1]));
asm("mov %0, %%db2" ::"r" (proc->userp->u_debugreg[2]));
asm("mov %0, %%db3" ::"r" (proc->userp->u_debugreg[3]));
// asm("mov %0, %%db4" ::"r" (proc->userp->u_debugreg[4]));
// asm("mov %0, %%db5" ::"r" (proc->userp->u_debugreg[5]));
asm("mov %0, %%db6" ::"r" (proc->userp->u_debugreg[6]));
asm("mov %0, %%db7" ::"r" (proc->userp->u_debugreg[7]));
regs->r15 = proc->userp->regs.r15;
regs->r14 = proc->userp->regs.r14;
regs->r13 = proc->userp->regs.r13;
regs->r12 = proc->userp->regs.r12;
regs->rbp = proc->userp->regs.rbp;
regs->rbx = proc->userp->regs.rbx;
regs->r11 = proc->userp->regs.r11;
regs->r10 = proc->userp->regs.r10;
regs->r9 = proc->userp->regs.r9;
regs->r8 = proc->userp->regs.r8;
regs->rax = proc->userp->regs.rax;
regs->rcx = proc->userp->regs.rcx;
regs->rdx = proc->userp->regs.rdx;
regs->rsi = proc->userp->regs.rsi;
regs->rdi = proc->userp->regs.rdi;
regs->rip = proc->userp->regs.rip;
regs->cs = proc->userp->regs.cs;
regs->rflags = proc->userp->regs.eflags;
regs->rsp = proc->userp->regs.rsp;
regs->ss = proc->userp->regs.ss;
}
void
peekuser(struct process *proc, void *regs0)
{

53
kernel/syscall.c
View File

@@ -2378,6 +2378,27 @@ out:
return error;
}
static long ptrace_pokeuser(int pid, long addr, long data)
{
long rc = -EIO;
struct process *child;
ihk_spinlock_t *savelock;
unsigned long irqstate;
if(addr > sizeof(struct user) - 8 || addr < 0)
return -EFAULT;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
return -ESRCH;
if(child->status == PS_TRACED){
memcpy((char *)child->userp + addr, &data, 8);
rc = 0;
}
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
static long ptrace_peekuser(int pid, long addr)
{
long rc = -EIO;
@@ -2385,7 +2406,7 @@ static long ptrace_peekuser(int pid, long addr)
ihk_spinlock_t *savelock;
unsigned long irqstate;
if(addr > sizeof(struct user) || addr < 0)
if(addr > sizeof(struct user) - 8|| addr < 0)
return -EFAULT;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
@@ -2397,6 +2418,28 @@ static long ptrace_peekuser(int pid, long addr)
return rc;
}
static long ptrace_getregs(int pid, long data)
{
struct user_regs_struct *regs = (struct user_regs_struct *)data;
long rc = -EIO;
struct process *child;
ihk_spinlock_t *savelock;
unsigned long irqstate;
child = findthread_and_lock(pid, -1, &savelock, &irqstate);
if (!child)
return -ESRCH;
if(child->status == PS_TRACED){
if(copy_to_user(child, regs, child->userp, sizeof(struct user_regs_struct)))
rc = -EFAULT;
else
rc = 0;
}
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
SYSCALL_DECLARE(ptrace)
{
const long request = (long)ihk_mc_syscall_arg0(ctx);
@@ -2415,10 +2458,18 @@ SYSCALL_DECLARE(ptrace)
dkprintf("ptrace: PTRACE_KILL/CONT\n");
error = ptrace_wakeup_sig(pid, request, data);
break;
case PTRACE_GETREGS:
error = ptrace_getregs(pid, data);
dkprintf("PTRACE_GETREGS: data=%p return=%p\n", data, error);
break;
case PTRACE_PEEKUSER:
error = ptrace_peekuser(pid, addr);
dkprintf("PTRACE_PEEKUSER: addr=%p return=%p\n", addr, error);
break;
case PTRACE_POKEUSER:
error = ptrace_pokeuser(pid, addr, data);
dkprintf("PTRACE_POKEUSER: addr=%p data=%p return=%p\n", addr, data, error);
break;
default:
dkprintf("ptrace: unimplemented ptrace called.\n");
break;