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uml: use ptrace directly in libc code 

Some register accessor cleanups -
	userspace() was calling restore_registers and save_registers for no
reason, since userspace() is on the libc side of the house, and these
add no value over calling ptrace directly
	init_thread_registers and get_safe_registers were the same thing,
so init_thread_registers is gone

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jeff Dike 2008-02-04 22:30:57 -08:00 committed by Linus Torvalds
parent ee3d9bd4de
commit d25f2e1235
4 changed files with 13 additions and 14 deletions
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1
arch/um/include/registers.h
View File

@ -9,7 +9,6 @@
#include "sysdep/ptrace.h"
#include "sysdep/archsetjmp.h"
extern void init_thread_registers(struct uml_pt_regs *to);
extern int save_fp_registers(int pid, unsigned long *fp_regs);
extern int restore_fp_registers(int pid, unsigned long *fp_regs);
extern int save_fpx_registers(int pid, unsigned long *fp_regs);

2
arch/um/kernel/process.c
View File

@ -199,7 +199,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp,
arch_copy_thread(&current->thread.arch, &p->thread.arch);
}
else {
init_thread_registers(&p->thread.regs.regs);
get_safe_registers(p->thread.regs.regs.gp);
p->thread.request.u.thread = current->thread.request.u.thread;
handler = new_thread_handler;
}

13
arch/um/os-Linux/registers.c
View File

@ -10,15 +10,6 @@
#include "sysdep/ptrace.h"
#include "user.h"
/* This is set once at boot time and not changed thereafter */
static unsigned long exec_regs[MAX_REG_NR];
void init_thread_registers(struct uml_pt_regs *to)
{
memcpy(to->gp, exec_regs, sizeof(to->gp));
}
void save_registers(int pid, struct uml_pt_regs *regs)
{
int err;
@ -39,6 +30,10 @@ void restore_registers(int pid, struct uml_pt_regs *regs)
"errno = %d\n", errno);
}
/* This is set once at boot time and not changed thereafter */
static unsigned long exec_regs[MAX_REG_NR];
void init_registers(int pid)
{
int err;

11
arch/um/os-Linux/skas/process.c
View File

@ -300,7 +300,9 @@ void userspace(struct uml_pt_regs *regs)
nsecs += os_nsecs();
while (1) {
restore_registers(pid, regs);
if (ptrace(PTRACE_SETREGS, pid, 0, regs->gp))
panic("userspace - PTRACE_SETREGS failed, "
"errno = %d\n", errno);
/* Now we set local_using_sysemu to be used for one loop */
local_using_sysemu = get_using_sysemu();
@ -320,7 +322,10 @@ void userspace(struct uml_pt_regs *regs)
errno);
regs->is_user = 1;
save_registers(pid, regs);
if (ptrace(PTRACE_GETREGS, pid, 0, regs->gp))
panic("userspace - saving registers failed, "
"errno = %d\n", errno);
UPT_SYSCALL_NR(regs) = -1; /* Assume: It's not a syscall */
if (WIFSTOPPED(status)) {
@ -343,7 +348,7 @@ void userspace(struct uml_pt_regs *regs)
break;
case SIGVTALRM:
now = os_nsecs();
if(now < nsecs)
if (now < nsecs)
break;
block_signals();
(*sig_info[sig])(sig, regs);