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support PTRACE_ARCH_PRCTL.

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refs #420
This commit is contained in:
Susumu Komae
2015-03-03 14:22:57 +09:00
committed by postpeta
parent 377341ce5f
commit 8c179d506a
1 changed files with 58 additions and 1 deletions
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59
kernel/syscall.c
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@ -2856,6 +2856,62 @@ static long ptrace_setregs(int pid, long data)
return rc;
}
static long ptrace_arch_prctl(int pid, long code, long addr)
{
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->ftn->status == PS_TRACED) {
switch (code) {
case ARCH_GET_FS: {
struct process *proc = cpu_local_var(current);
unsigned long value;
unsigned long *p = (unsigned long *)addr;
rc = ptrace_read_user(child,
offsetof(struct user_regs_struct, fs_base),
&value);
if (rc == 0) {
rc = copy_to_user(proc, p, (char *)&value, sizeof(value));
}
break;
}
case ARCH_GET_GS: {
struct process *proc = cpu_local_var(current);
unsigned long value;
unsigned long *p = (unsigned long *)addr;
rc = ptrace_read_user(child,
offsetof(struct user_regs_struct, gs_base),
&value);
if (rc == 0) {
rc = copy_to_user(proc, p, (char *)&value, sizeof(value));
}
break;
}
case ARCH_SET_FS:
rc = ptrace_write_user(child,
offsetof(struct user_regs_struct, fs_base),
(unsigned long)addr);
break;
case ARCH_SET_GS:
rc = ptrace_write_user(child,
offsetof(struct user_regs_struct, gs_base),
(unsigned long)addr);
break;
default:
rc = -EINVAL;
break;
}
}
ihk_mc_spinlock_unlock(savelock, irqstate);
return rc;
}
static long ptrace_peektext(int pid, long addr, long data)
{
long rc = -EIO;
@ -3356,7 +3412,8 @@ SYSCALL_DECLARE(ptrace)
dkprintf("ptrace: unimplemented ptrace(PTRACE_GET_THREAD_AREA) called.\n");
break;
case PTRACE_ARCH_PRCTL:
dkprintf("ptrace: unimplemented ptrace(PTRACE_ARCH_PRCTL) called.\n");
error = ptrace_arch_prctl(pid, data, addr);
dkprintf("PTRACE_ARCH_PRCTL: data=%p addr=%p return=%p\n", data, addr, error);
break;
case PTRACE_GETEVENTMSG:
dkprintf("ptrace: PTRACE_GETEVENTMSG: data=%p\n", data);