diff options
| author | Jeff Dike <jdike@addtoit.com> | 2008-02-05 06:30:57 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-02-05 17:44:28 (GMT) |
| commit | d25f2e1235aab716c9fd6ba36c42503627a3a0e3 (patch) | |
| tree | 5eaabe739be50f1417707fb6eef2da75dc567a30 /arch | |
| parent | ee3d9bd4de1ed93d2a7ee41c331ed30a1c7b8acd (diff) | |
| download | linux-d25f2e1235aab716c9fd6ba36c42503627a3a0e3.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/um/include/registers.h | 1 | ||||
| -rw-r--r-- | arch/um/kernel/process.c | 2 | ||||
| -rw-r--r-- | arch/um/os-Linux/registers.c | 13 | ||||
| -rw-r--r-- | arch/um/os-Linux/skas/process.c | 11 |
4 files changed, 13 insertions, 14 deletions
diff --git a/arch/um/include/registers.h b/arch/um/include/registers.h index 0e27406..6df3748 100644 --- a/arch/um/include/registers.h +++ b/arch/um/include/registers.h @@ -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); diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c index ae1942e..7a29123 100644 --- a/arch/um/kernel/process.c +++ b/arch/um/kernel/process.c @@ -199,7 +199,7 @@ int copy_thread(int nr, unsigned long clone_flags, unsigned long sp, arch_copy_thread(¤t->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; } diff --git a/arch/um/os-Linux/registers.c b/arch/um/os-Linux/registers.c index a32ba6a..c78fae3 100644 --- a/arch/um/os-Linux/registers.c +++ b/arch/um/os-Linux/registers.c @@ -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; diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 2cc2071..7dc24e3 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -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); |