diff options
| -rw-r--r-- | arch/um/os-Linux/skas/process.c | 11 | ||||
| -rw-r--r-- | arch/um/sys-i386/stub_segv.c | 19 | ||||
| -rw-r--r-- | arch/um/sys-x86_64/stub_segv.c | 39 |
3 files changed, 11 insertions, 58 deletions
diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c index 765cfa6ddbc..2cc2071112b 100644 --- a/arch/um/os-Linux/skas/process.c +++ b/arch/um/os-Linux/skas/process.c @@ -55,10 +55,10 @@ static int ptrace_dump_regs(int pid) * Signals that are OK to receive in the stub - we'll just continue it. * SIGWINCH will happen when UML is inside a detached screen. */ -#define STUB_SIG_MASK ((1 << SIGVTALRM) | (1 << SIGWINCH)) +#define STUB_SIG_MASK (1 << SIGVTALRM) /* Signals that the stub will finish with - anything else is an error */ -#define STUB_DONE_MASK ((1 << SIGUSR1) | (1 << SIGTRAP)) +#define STUB_DONE_MASK (1 << SIGTRAP) void wait_stub_done(int pid) { @@ -179,6 +179,7 @@ static int userspace_tramp(void *stack) ptrace(PTRACE_TRACEME, 0, 0, 0); signal(SIGTERM, SIG_DFL); + signal(SIGWINCH, SIG_IGN); err = set_interval(); if (err) panic("userspace_tramp - setting timer failed, errno = %d\n", @@ -222,11 +223,7 @@ static int userspace_tramp(void *stack) set_sigstack((void *) STUB_DATA, UM_KERN_PAGE_SIZE); sigemptyset(&sa.sa_mask); - sigaddset(&sa.sa_mask, SIGIO); - sigaddset(&sa.sa_mask, SIGWINCH); - sigaddset(&sa.sa_mask, SIGVTALRM); - sigaddset(&sa.sa_mask, SIGUSR1); - sa.sa_flags = SA_ONSTACK; + sa.sa_flags = SA_ONSTACK | SA_NODEFER; sa.sa_handler = (void *) v; sa.sa_restorer = NULL; if (sigaction(SIGSEGV, &sa, NULL) < 0) diff --git a/arch/um/sys-i386/stub_segv.c b/arch/um/sys-i386/stub_segv.c index b3999cb76bf..28ccf737a79 100644 --- a/arch/um/sys-i386/stub_segv.c +++ b/arch/um/sys-i386/stub_segv.c @@ -1,32 +1,17 @@ /* - * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) + * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ -#include <signal.h> -#include <sys/select.h> /* The only way I can see to get sigset_t */ -#include <asm/unistd.h> -#include "as-layout.h" -#include "uml-config.h" #include "sysdep/stub.h" #include "sysdep/sigcontext.h" -#include "sysdep/faultinfo.h" void __attribute__ ((__section__ (".__syscall_stub"))) stub_segv_handler(int sig) { struct sigcontext *sc = (struct sigcontext *) (&sig + 1); - int pid; GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), sc); - pid = stub_syscall0(__NR_getpid); - stub_syscall2(__NR_kill, pid, SIGUSR1); - - /* Load pointer to sigcontext into esp, since we need to leave - * the stack in its original form when we do the sigreturn here, by - * hand. - */ - __asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; " - "int $0x80" : : "a" (sc), "g" (__NR_sigreturn)); + trap_myself(); } diff --git a/arch/um/sys-x86_64/stub_segv.c b/arch/um/sys-x86_64/stub_segv.c index 3afb590f007..ced051afc70 100644 --- a/arch/um/sys-x86_64/stub_segv.c +++ b/arch/um/sys-x86_64/stub_segv.c @@ -1,51 +1,22 @@ /* - * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) + * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) * Licensed under the GPL */ -#include <stddef.h> #include <signal.h> -#include <asm/unistd.h> #include "as-layout.h" -#include "uml-config.h" -#include "sysdep/sigcontext.h" -#include "sysdep/faultinfo.h" #include "sysdep/stub.h" - -/* Copied from sys-x86_64/signal.c - Can't find an equivalent definition - * in the libc headers anywhere. - */ -struct rt_sigframe -{ - char *pretcode; - struct ucontext uc; - struct siginfo info; -}; - -/* Copied here from <linux/kernel.h> - we're userspace. */ -#define container_of(ptr, type, member) ({ \ - const typeof( ((type *)0)->member ) *__mptr = (ptr); \ - (type *)( (char *)__mptr - offsetof(type,member) );}) +#include "sysdep/faultinfo.h" +#include "sysdep/sigcontext.h" void __attribute__ ((__section__ (".__syscall_stub"))) stub_segv_handler(int sig) { struct ucontext *uc; - int pid; __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :); GET_FAULTINFO_FROM_SC(*((struct faultinfo *) STUB_DATA), &uc->uc_mcontext); - - pid = stub_syscall0(__NR_getpid); - stub_syscall2(__NR_kill, pid, SIGUSR1); - - /* sys_sigreturn expects that the stack pointer will be 8 bytes into - * the signal frame. So, we use the ucontext pointer, which we know - * already, to get the signal frame pointer, and add 8 to that. - */ - __asm__ __volatile__("movq %0, %%rsp; movq %1, %%rax ; syscall": : - "g" ((unsigned long) - container_of(uc, struct rt_sigframe, uc) + 8), - "g" (__NR_rt_sigreturn)); + trap_myself(); } + |