diff options
Diffstat (limited to 'arch/um/os-Linux/start_up.c')
| -rw-r--r-- | arch/um/os-Linux/start_up.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c index a8b5b9d9c6e..040cc1472bc 100644 --- a/arch/um/os-Linux/start_up.c +++ b/arch/um/os-Linux/start_up.c @@ -161,7 +161,7 @@ __uml_setup("nosysemu", nosysemu_cmd_param, static void __init check_sysemu(void) { void *stack; - int pid, syscall, n, status, count=0; + int pid, n, status, count=0; printk("Checking syscall emulation patch for ptrace..."); sysemu_supported = 0; @@ -192,6 +192,12 @@ static void __init check_sysemu(void) printk("Checking advanced syscall emulation patch for ptrace..."); pid = start_ptraced_child(&stack); + + if(ptrace(PTRACE_OLDSETOPTIONS, pid, 0, + (void *) PTRACE_O_TRACESYSGOOD) < 0) + panic("check_ptrace: PTRACE_OLDSETOPTIONS failed, errno = %d", + errno); + while(1){ count++; if(ptrace(PTRACE_SYSEMU_SINGLESTEP, pid, 0, 0) < 0) @@ -199,15 +205,10 @@ static void __init check_sysemu(void) CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); if(n < 0) panic("check_ptrace : wait failed, errno = %d", errno); - if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP)) - panic("check_ptrace : expected (SIGTRAP|SYSCALL_TRAP), " - "got status = %d", status); - - syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, - 0); - if(syscall == __NR_getpid){ + if(WIFSTOPPED(status) && (WSTOPSIG(status) == (SIGTRAP|0x80))){ if (!count) - panic("check_ptrace : SYSEMU_SINGLESTEP doesn't singlestep"); + panic("check_ptrace : SYSEMU_SINGLESTEP " + "doesn't singlestep"); n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, os_getpid()); if(n < 0) @@ -215,6 +216,11 @@ static void __init check_sysemu(void) "call return, errno = %d", errno); break; } + else if(WIFSTOPPED(status) && (WSTOPSIG(status) == SIGTRAP)) + count++; + else + panic("check_ptrace : expected SIGTRAP or " + "(SIGTRAP|0x80), got status = %d", status); } if (stop_ptraced_child(pid, stack, 0, 0) < 0) goto fail_stopped; @@ -250,8 +256,8 @@ static void __init check_ptrace(void) CATCH_EINTR(n = waitpid(pid, &status, WUNTRACED)); if(n < 0) panic("check_ptrace : wait failed, errno = %d", errno); - if(!WIFSTOPPED(status) || (WSTOPSIG(status) != SIGTRAP + 0x80)) - panic("check_ptrace : expected SIGTRAP + 0x80, " + if(!WIFSTOPPED(status) || (WSTOPSIG(status) != (SIGTRAP|0x80))) + panic("check_ptrace : expected (SIGTRAP|0x80), " "got status = %d", status); syscall = ptrace(PTRACE_PEEKUSR, pid, PT_SYSCALL_NR_OFFSET, |