Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) |
| 3 | * Licensed under the GPL |
| 4 | */ |
| 5 | |
Al Viro | 30f7dab | 2005-09-03 15:57:43 -0700 | [diff] [blame] | 6 | #include <asm/signal.h> |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 7 | #include <linux/compiler.h> |
| 8 | #include <asm/unistd.h> |
Al Viro | 30f7dab | 2005-09-03 15:57:43 -0700 | [diff] [blame] | 9 | #include <asm/ucontext.h> |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 10 | #include "uml-config.h" |
| 11 | #include "sysdep/sigcontext.h" |
| 12 | #include "sysdep/faultinfo.h" |
Jeff Dike | 50f72b5 | 2005-10-09 16:11:44 -0400 | [diff] [blame^] | 13 | #include <stddef.h> |
| 14 | |
| 15 | /* Copied from sys-x86_64/signal.c - Can't find an equivalent definition |
| 16 | * in the libc headers anywhere. |
| 17 | */ |
| 18 | struct rt_sigframe |
| 19 | { |
| 20 | char *pretcode; |
| 21 | struct ucontext uc; |
| 22 | struct siginfo info; |
| 23 | }; |
| 24 | |
| 25 | /* Copied here from <linux/kernel.h> - we're userspace. */ |
| 26 | #define container_of(ptr, type, member) ({ \ |
| 27 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ |
| 28 | (type *)( (char *)__mptr - offsetof(type,member) );}) |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 29 | |
| 30 | void __attribute__ ((__section__ (".__syscall_stub"))) |
| 31 | stub_segv_handler(int sig) |
| 32 | { |
| 33 | struct ucontext *uc; |
| 34 | |
| 35 | __asm__("movq %%rdx, %0" : "=g" (uc) :); |
Jeff Dike | 50f72b5 | 2005-10-09 16:11:44 -0400 | [diff] [blame^] | 36 | GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA), |
| 37 | &uc->uc_mcontext); |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 38 | |
Jeff Dike | 50f72b5 | 2005-10-09 16:11:44 -0400 | [diff] [blame^] | 39 | __asm__("movq %0, %%rax ; syscall": : "g" (__NR_getpid)); |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 40 | __asm__("movq %%rax, %%rdi ; movq %0, %%rax ; movq %1, %%rsi ;" |
Jeff Dike | 50f72b5 | 2005-10-09 16:11:44 -0400 | [diff] [blame^] | 41 | "syscall": : "g" (__NR_kill), "g" (SIGUSR1) : |
| 42 | "%rdi", "%rax", "%rsi"); |
| 43 | /* sys_sigreturn expects that the stack pointer will be 8 bytes into |
| 44 | * the signal frame. So, we use the ucontext pointer, which we know |
| 45 | * already, to get the signal frame pointer, and add 8 to that. |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 46 | */ |
Jeff Dike | 50f72b5 | 2005-10-09 16:11:44 -0400 | [diff] [blame^] | 47 | __asm__("movq %0, %%rsp": : |
| 48 | "g" ((unsigned long) container_of(uc, struct rt_sigframe, |
| 49 | uc) + 8)); |
| 50 | __asm__("movq %0, %%rax ; syscall" : : "g" (__NR_rt_sigreturn)); |
Jeff Dike | d67b569 | 2005-07-07 17:56:49 -0700 | [diff] [blame] | 51 | } |