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Preserve the TF (Trap Flag) when continuing from a ptraced suspend.

This commit is contained in:
Ove Kaaven 2001-04-27 18:39:47 +00:00 committed by Alexandre Julliard
parent 15a3b74356
commit ada7383852
4 changed files with 28 additions and 5 deletions
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9
server/context_i386.c
View File

@ -474,6 +474,15 @@ void *get_thread_ip( struct thread *thread )
return (void *)context.Eip;
}
/* determine if we should continue the thread in single-step mode */
int get_thread_single_step( struct thread *thread )
{
CONTEXT context;
if (thread->context) return 0; /* don't single-step inside exception event */
get_thread_context( thread, CONTEXT_CONTROL, &context );
return (context.EFlags & 0x100) != 0;
}
/* retrieve the current context of a thread */
DECL_HANDLER(get_thread_context)
{

6
server/context_sparc.c
View File

@ -157,6 +157,12 @@ void *get_thread_ip( struct thread *thread )
return (void *)context.pc;
}
/* determine if we should continue the thread in single-step mode */
int get_thread_single_step( struct thread *thread )
{
return 0; /* FIXME */
}
/* retrieve the current context of a thread */
DECL_HANDLER(get_thread_context)
{

17
server/ptrace.c
View File

@ -26,6 +26,9 @@
#ifndef PTRACE_CONT
#define PTRACE_CONT PT_CONTINUE
#endif
#ifndef PTRACE_SINGLESTEP
#define PTRACE_SINGLESTEP PT_STEP
#endif
#ifndef PTRACE_ATTACH
#define PTRACE_ATTACH PT_ATTACH
#endif
@ -49,6 +52,7 @@ static const int use_ptrace = 0;
#define PT_DETACH 2
#define PT_READ_D 3
#define PT_WRITE_D 4
#define PT_STEP 5
static int ptrace(int req, ...) { return -1; /*FAIL*/ }
#endif
@ -64,11 +68,13 @@ static int handle_child_status( struct thread *thread, int pid, int status )
switch(sig)
{
case SIGSTOP: /* continue at once if not suspended */
if (!thread || !(thread->process->suspend + thread->suspend))
ptrace( PTRACE_CONT, pid, (caddr_t)1, sig );
break;
if (thread && (thread->process->suspend + thread->suspend)) break;
/* fall through */
default: /* ignore other signals for now */
ptrace( PTRACE_CONT, pid, (caddr_t)1, sig );
if (thread && get_thread_single_step( thread ))
ptrace( PTRACE_SINGLESTEP, pid, (caddr_t)1, sig );
else
ptrace( PTRACE_CONT, pid, (caddr_t)1, sig );
break;
}
return sig;
@ -168,7 +174,8 @@ void continue_thread( struct thread *thread )
{
if (!thread->unix_pid) return;
if (!thread->attached) kill( thread->unix_pid, SIGCONT );
else ptrace( PTRACE_CONT, thread->unix_pid, (caddr_t)1, SIGSTOP );
else ptrace( get_thread_single_step(thread) ? PTRACE_SINGLESTEP : PTRACE_CONT,
thread->unix_pid, (caddr_t)1, SIGSTOP );
}
/* suspend a thread to allow using ptrace on it */

1
server/thread.h
View File

@ -118,6 +118,7 @@ extern int suspend_for_ptrace( struct thread *thread );
extern int read_thread_int( struct thread *thread, const int *addr, int *data );
extern int write_thread_int( struct thread *thread, int *addr, int data, unsigned int mask );
extern void *get_thread_ip( struct thread *thread );
extern int get_thread_single_step( struct thread *thread );
extern unsigned int global_error; /* global error code for when no thread is current */