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d67b569f JD |
1 | /* |
2 | * Copyright (C) 2004 Jeff Dike (jdike@addtoit.com) | |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
17d46971 JD |
6 | #include <stddef.h> |
7 | #include <signal.h> | |
d67b569f JD |
8 | #include <asm/unistd.h> |
9 | #include "uml-config.h" | |
10 | #include "sysdep/sigcontext.h" | |
11 | #include "sysdep/faultinfo.h" | |
17d46971 | 12 | #include "sysdep/stub.h" |
50f72b57 JD |
13 | |
14 | /* Copied from sys-x86_64/signal.c - Can't find an equivalent definition | |
15 | * in the libc headers anywhere. | |
16 | */ | |
17 | struct rt_sigframe | |
18 | { | |
19 | char *pretcode; | |
20 | struct ucontext uc; | |
21 | struct siginfo info; | |
22 | }; | |
23 | ||
24 | /* Copied here from <linux/kernel.h> - we're userspace. */ | |
25 | #define container_of(ptr, type, member) ({ \ | |
26 | const typeof( ((type *)0)->member ) *__mptr = (ptr); \ | |
27 | (type *)( (char *)__mptr - offsetof(type,member) );}) | |
d67b569f JD |
28 | |
29 | void __attribute__ ((__section__ (".__syscall_stub"))) | |
30 | stub_segv_handler(int sig) | |
31 | { | |
32 | struct ucontext *uc; | |
17d46971 | 33 | int pid; |
d67b569f | 34 | |
fb30d645 | 35 | __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :); |
50f72b57 JD |
36 | GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA), |
37 | &uc->uc_mcontext); | |
d67b569f | 38 | |
17d46971 JD |
39 | pid = stub_syscall0(__NR_getpid); |
40 | stub_syscall2(__NR_kill, pid, SIGUSR1); | |
41 | ||
50f72b57 JD |
42 | /* sys_sigreturn expects that the stack pointer will be 8 bytes into |
43 | * the signal frame. So, we use the ucontext pointer, which we know | |
44 | * already, to get the signal frame pointer, and add 8 to that. | |
d67b569f | 45 | */ |
fb30d645 JD |
46 | __asm__ __volatile__("movq %0, %%rsp; movq %1, %%rax ; syscall": : |
47 | "g" ((unsigned long) | |
48 | container_of(uc, struct rt_sigframe, uc) + 8), | |
49 | "g" (__NR_rt_sigreturn)); | |
d67b569f | 50 | } |