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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 <linux/compiler.h> |
9 | #include <asm/unistd.h> | |
10 | #include "uml-config.h" | |
11 | #include "sysdep/sigcontext.h" | |
12 | #include "sysdep/faultinfo.h" | |
17d46971 | 13 | #include "sysdep/stub.h" |
50f72b57 JD |
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) );}) | |
d67b569f JD |
29 | |
30 | void __attribute__ ((__section__ (".__syscall_stub"))) | |
31 | stub_segv_handler(int sig) | |
32 | { | |
33 | struct ucontext *uc; | |
17d46971 | 34 | int pid; |
d67b569f | 35 | |
fb30d645 | 36 | __asm__ __volatile__("movq %%rdx, %0" : "=g" (uc) :); |
50f72b57 JD |
37 | GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA), |
38 | &uc->uc_mcontext); | |
d67b569f | 39 | |
17d46971 JD |
40 | pid = stub_syscall0(__NR_getpid); |
41 | stub_syscall2(__NR_kill, pid, SIGUSR1); | |
42 | ||
50f72b57 JD |
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. | |
d67b569f | 46 | */ |
fb30d645 JD |
47 | __asm__ __volatile__("movq %0, %%rsp; movq %1, %%rax ; syscall": : |
48 | "g" ((unsigned long) | |
49 | container_of(uc, struct rt_sigframe, uc) + 8), | |
50 | "g" (__NR_rt_sigreturn)); | |
d67b569f | 51 | } |