Commit 1bd09508 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Linus Torvalds

um: use generic ptrace_resume code

Use the generic ptrace_resume code for PTRACE_SYSCALL, PTRACE_CONT,
PTRACE_KILL and PTRACE_SINGLESTEP.  This implies defining
arch_has_single_step in <asm/ptrace.h> and implementing the
user_enable_single_step and user_disable_single_step functions, which also
causes the breakpoint information to be cleared on fork, which could be
considered a bug fix.

Also the TIF_SYSCALL_TRACE thread flag is now cleared on PTRACE_KILL which
it previously wasn't which is consistent with all architectures using the
modern ptrace code.

XXX: I'm not sure arch_has_single_step() is placed in the exactly correct
location, please verify in which of the ptrace headers it should really
be.
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 55436c91
...@@ -16,6 +16,8 @@ struct pt_regs { ...@@ -16,6 +16,8 @@ struct pt_regs {
struct uml_pt_regs regs; struct uml_pt_regs regs;
}; };
#define arch_has_single_step() (1)
#define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS } #define EMPTY_REGS { .regs = EMPTY_UML_PT_REGS }
#define PT_REGS_IP(r) UPT_IP(&(r)->regs) #define PT_REGS_IP(r) UPT_IP(&(r)->regs)
......
...@@ -12,16 +12,25 @@ ...@@ -12,16 +12,25 @@
#endif #endif
#include "skas_ptrace.h" #include "skas_ptrace.h"
static inline void set_singlestepping(struct task_struct *child, int on)
void user_enable_single_step(struct task_struct *child)
{ {
if (on) child->ptrace |= PT_DTRACE;
child->ptrace |= PT_DTRACE;
else
child->ptrace &= ~PT_DTRACE;
child->thread.singlestep_syscall = 0; child->thread.singlestep_syscall = 0;
#ifdef SUBARCH_SET_SINGLESTEPPING #ifdef SUBARCH_SET_SINGLESTEPPING
SUBARCH_SET_SINGLESTEPPING(child, on); SUBARCH_SET_SINGLESTEPPING(child, 1);
#endif
}
void user_disable_single_step(struct task_struct *child)
{
child->ptrace &= ~PT_DTRACE;
child->thread.singlestep_syscall = 0;
#ifdef SUBARCH_SET_SINGLESTEPPING
SUBARCH_SET_SINGLESTEPPING(child, 0);
#endif #endif
} }
...@@ -30,7 +39,7 @@ static inline void set_singlestepping(struct task_struct *child, int on) ...@@ -30,7 +39,7 @@ static inline void set_singlestepping(struct task_struct *child, int on)
*/ */
void ptrace_disable(struct task_struct *child) void ptrace_disable(struct task_struct *child)
{ {
set_singlestepping(child,0); user_disable_single_step(child);
} }
extern int peek_user(struct task_struct * child, long addr, long data); extern int peek_user(struct task_struct * child, long addr, long data);
...@@ -69,53 +78,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) ...@@ -69,53 +78,6 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
ret = -EIO; ret = -EIO;
break; break;
/* continue and stop at next (return from) syscall */
case PTRACE_SYSCALL:
/* restart after signal. */
case PTRACE_CONT: {
ret = -EIO;
if (!valid_signal(data))
break;
set_singlestepping(child, 0);
if (request == PTRACE_SYSCALL)
set_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
else clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
child->exit_code = data;
wake_up_process(child);
ret = 0;
break;
}
/*
* make the child exit. Best I can do is send it a sigkill.
* perhaps it should be put in the status that it wants to
* exit.
*/
case PTRACE_KILL: {
ret = 0;
if (child->exit_state == EXIT_ZOMBIE) /* already dead */
break;
set_singlestepping(child, 0);
child->exit_code = SIGKILL;
wake_up_process(child);
break;
}
case PTRACE_SINGLESTEP: { /* set the trap flag. */
ret = -EIO;
if (!valid_signal(data))
break;
clear_tsk_thread_flag(child, TIF_SYSCALL_TRACE);
set_singlestepping(child, 1);
child->exit_code = data;
/* give it a chance to run. */
wake_up_process(child);
ret = 0;
break;
}
#ifdef PTRACE_GETREGS #ifdef PTRACE_GETREGS
case PTRACE_GETREGS: { /* Get all gp regs from the child. */ case PTRACE_GETREGS: { /* Get all gp regs from the child. */
if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) { if (!access_ok(VERIFY_WRITE, p, MAX_REG_OFFSET)) {
......
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