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https://github.com/jart/cosmopolitan.git
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40291c9db3
- Polyfill ucontext_t on FreeBSD/OpenBSD/NetBSD - Add tests confirming signals can edit CPU state - Work towards supporting ZIP filesystem on bare metal - Add more tinymath unit tests for POSIX conformance - Add X87 and SSE status flags to crash report - Fix some bugs in blinkenlights - Fix llvm build breakage
34 lines
1.6 KiB
C
34 lines
1.6 KiB
C
#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/ucontext.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "third_party/xed/x86.h"
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void handler(int sig, siginfo_t *si, ucontext_t *ctx) {
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struct XedDecodedInst xedd;
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xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
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xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
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ctx->uc_mcontext.rip += xedd.length;
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ctx->uc_mcontext.rax = 42;
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ctx->uc_mcontext.rdx = 0;
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}
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int main(int argc, char *argv[]) {
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struct sigaction saint = {.sa_sigaction = handler, .sa_flags = SA_SIGINFO};
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sigaction(SIGFPE, &saint, NULL);
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volatile long x = 0;
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printf("123/0 = %ld\n", 123 / x);
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return 0;
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}
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