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ptrace: Introduce get/set regs helpers

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Required for simpler next patching.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2013-11-01 14:23:32 +04:00
parent c1c9b8f6dc
commit c2a366d44d
1 changed files with 17 additions and 7 deletions
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24
parasite-syscall.c
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@ -65,6 +65,16 @@ static struct vma_area *get_vma_by_ip(struct list_head *vma_area_list, unsigned
return NULL;
}
static inline int ptrace_get_regs(int pid, user_regs_struct_t *regs)
{
return ptrace(PTRACE_GETREGS, pid, NULL, regs);
}
static inline int ptrace_set_regs(int pid, user_regs_struct_t *regs)
{
return ptrace(PTRACE_SETREGS, pid, NULL, regs);
}
static int get_thread_ctx(int pid, struct thread_ctx *ctx)
{
if (ptrace(PTRACE_GETSIGMASK, pid, sizeof(k_rtsigset_t), &ctx->sigmask)) {
@ -72,7 +82,7 @@ static int get_thread_ctx(int pid, struct thread_ctx *ctx)
return -1;
}
if (ptrace(PTRACE_GETREGS, pid, NULL, &ctx->regs)) {
if (ptrace_get_regs(pid, &ctx->regs)) {
pr_perror("Can't obtain registers (pid: %d)", pid);
return -1;
}
@ -84,7 +94,7 @@ static int restore_thread_ctx(int pid, struct thread_ctx *ctx)
{
int ret = 0;
if (ptrace(PTRACE_SETREGS, pid, NULL, &ctx->regs)) {
if (ptrace_set_regs(pid, &ctx->regs)) {
pr_perror("Can't restore registers (pid: %d)", pid);
ret = -1;
}
@ -108,7 +118,7 @@ static int parasite_run(pid_t pid, int cmd, unsigned long ip, void *stack,
}
parasite_setup_regs(ip, stack, regs);
if (ptrace(PTRACE_SETREGS, pid, NULL, regs)) {
if (ptrace_set_regs(pid, regs)) {
pr_perror("Can't set registers for %d", pid);
goto err_regs;
}
@ -121,7 +131,7 @@ static int parasite_run(pid_t pid, int cmd, unsigned long ip, void *stack,
return 0;
err_cont:
if (ptrace(PTRACE_SETREGS, pid, NULL, &octx->regs))
if (ptrace_set_regs(pid, &octx->regs))
pr_perror("Can't restore regs for %d", pid);
err_regs:
if (ptrace(PTRACE_SETSIGMASK, pid, sizeof(k_rtsigset_t), &octx->sigmask))
@ -159,7 +169,7 @@ static int parasite_trap(struct parasite_ctl *ctl, pid_t pid,
goto err;
}
if (ptrace(PTRACE_GETREGS, pid, NULL, regs)) {
if (ptrace_get_regs(pid, regs)) {
pr_perror("Can't obtain registers (pid: %d)", pid);
goto err;
}
@ -812,7 +822,7 @@ static int parasite_fini_seized(struct parasite_ctl *ctl)
return -1;
}
ret = ptrace(PTRACE_GETREGS, pid, NULL, &regs);
ret = ptrace_get_regs(pid, &regs);
if (ret) {
pr_perror("Unable to get registers");
return -1;
@ -876,7 +886,7 @@ int parasite_stop_on_syscall(int tasks, const int sys_nr)
pr_err("%d\n", status);
return -1;
}
ret = ptrace(PTRACE_GETREGS, pid, NULL, &regs);
ret = ptrace_get_regs(pid, &regs);
if (ret) {
pr_perror("ptrace");
return -1;