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Improve signal handling and math
- 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
This commit is contained in:
Justine Tunney
parent
cdc54ea1fd
commit
40291c9db3
109 changed files with 2316 additions and 520 deletions
196
libc/calls/sigenter-freebsd.c
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196
libc/calls/sigenter-freebsd.c
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2021 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/sigaction-freebsd.internal.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/typedef/sigaction_f.h"
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#include "libc/calls/ucontext.h"
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#include "libc/macros.h"
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#include "libc/str/str.h"
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union sigval_freebsd {
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int32_t sival_int;
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void *sival_ptr;
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int32_t sigval_int;
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void *sigval_ptr;
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};
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struct siginfo_freebsd {
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int32_t si_signo;
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int32_t si_errno;
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int32_t si_code;
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int32_t si_pid;
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uint32_t si_uid;
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int32_t si_status;
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void *si_addr;
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union sigval_freebsd si_value;
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union {
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struct {
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int _trapno;
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} _fault;
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struct {
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int _timerid;
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int _overrun;
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} _timer;
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struct {
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int _mqd;
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} _mesgq;
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struct {
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long _band;
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} _poll;
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struct {
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long __spare1__;
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int __spare2__[7];
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} __spare__;
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} _reason;
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};
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struct stack_freebsd {
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void *ss_sp;
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uint64_t ss_size;
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int32_t ss_flags;
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};
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struct mcontext_freebsd {
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int64_t mc_onstack;
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int64_t mc_rdi;
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int64_t mc_rsi;
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int64_t mc_rdx;
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int64_t mc_rcx;
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int64_t mc_r8;
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int64_t mc_r9;
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int64_t mc_rax;
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int64_t mc_rbx;
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int64_t mc_rbp;
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int64_t mc_r10;
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int64_t mc_r11;
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int64_t mc_r12;
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int64_t mc_r13;
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int64_t mc_r14;
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int64_t mc_r15;
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uint32_t mc_trapno;
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uint16_t mc_fs;
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uint16_t mc_gs;
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int64_t mc_addr;
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uint32_t mc_flags;
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uint16_t mc_es;
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uint16_t mc_ds;
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int64_t mc_err;
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int64_t mc_rip;
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int64_t mc_cs;
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int64_t mc_rflags;
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int64_t mc_rsp;
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int64_t mc_ss;
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int64_t mc_len;
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int64_t mc_fpformat;
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int64_t mc_ownedfp;
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int64_t mc_fpstate[64];
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int64_t mc_fsbase;
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int64_t mc_gsbase;
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int64_t mc_xfpustate;
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int64_t mc_xfpustate_len;
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long mc_spare[4];
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};
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struct ucontext_freebsd {
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struct sigset_freebsd uc_sigmask;
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struct mcontext_freebsd uc_mcontext;
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struct ucontext_freebsd *uc_link;
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struct stack_freebsd uc_stack;
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int32_t uc_flags;
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int32_t __spare__[4];
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};
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hidden void __sigenter_freebsd(int sig, struct siginfo_freebsd *si,
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struct ucontext_freebsd *ctx) {
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int rva;
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ucontext_t uc;
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rva = __sighandrvas[sig & (NSIG - 1)];
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if (rva >= kSigactionMinRva) {
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memset(&uc, 0, sizeof(uc));
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if (ctx) {
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uc.uc_mcontext.fpregs = &uc.__fpustate;
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uc.uc_stack.ss_sp = ctx->uc_stack.ss_sp;
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uc.uc_stack.ss_size = ctx->uc_stack.ss_size;
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uc.uc_stack.ss_flags = ctx->uc_stack.ss_flags;
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uc.uc_flags = ctx->uc_flags;
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memcpy(&uc.uc_sigmask, &ctx->uc_sigmask,
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MIN(sizeof(uc.uc_sigmask), sizeof(ctx->uc_sigmask)));
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uc.uc_mcontext.rdi = ctx->uc_mcontext.mc_rdi;
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uc.uc_mcontext.rsi = ctx->uc_mcontext.mc_rsi;
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uc.uc_mcontext.rdx = ctx->uc_mcontext.mc_rdx;
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uc.uc_mcontext.rcx = ctx->uc_mcontext.mc_rcx;
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uc.uc_mcontext.r8 = ctx->uc_mcontext.mc_r8;
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uc.uc_mcontext.r9 = ctx->uc_mcontext.mc_r9;
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uc.uc_mcontext.rax = ctx->uc_mcontext.mc_rax;
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uc.uc_mcontext.rbx = ctx->uc_mcontext.mc_rbx;
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uc.uc_mcontext.rbp = ctx->uc_mcontext.mc_rbp;
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uc.uc_mcontext.r10 = ctx->uc_mcontext.mc_r10;
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uc.uc_mcontext.r11 = ctx->uc_mcontext.mc_r11;
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uc.uc_mcontext.r12 = ctx->uc_mcontext.mc_r12;
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uc.uc_mcontext.r13 = ctx->uc_mcontext.mc_r13;
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uc.uc_mcontext.r14 = ctx->uc_mcontext.mc_r14;
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uc.uc_mcontext.r15 = ctx->uc_mcontext.mc_r15;
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uc.uc_mcontext.trapno = ctx->uc_mcontext.mc_trapno;
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uc.uc_mcontext.fs = ctx->uc_mcontext.mc_fs;
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uc.uc_mcontext.gs = ctx->uc_mcontext.mc_gs;
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uc.uc_mcontext.eflags = ctx->uc_mcontext.mc_flags;
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uc.uc_mcontext.err = ctx->uc_mcontext.mc_err;
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uc.uc_mcontext.rip = ctx->uc_mcontext.mc_rip;
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uc.uc_mcontext.rsp = ctx->uc_mcontext.mc_rsp;
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}
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((sigaction_f)(_base + rva))(sig, (void *)si, &uc);
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if (ctx) {
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ctx->uc_stack.ss_sp = uc.uc_stack.ss_sp;
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ctx->uc_stack.ss_size = uc.uc_stack.ss_size;
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ctx->uc_stack.ss_flags = uc.uc_stack.ss_flags;
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ctx->uc_flags = uc.uc_flags;
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memcpy(&ctx->uc_sigmask, &uc.uc_sigmask,
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MIN(sizeof(uc.uc_sigmask), sizeof(ctx->uc_sigmask)));
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ctx->uc_mcontext.mc_rdi = uc.uc_mcontext.rdi;
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ctx->uc_mcontext.mc_rsi = uc.uc_mcontext.rsi;
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ctx->uc_mcontext.mc_rdx = uc.uc_mcontext.rdx;
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ctx->uc_mcontext.mc_rcx = uc.uc_mcontext.rcx;
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ctx->uc_mcontext.mc_r8 = uc.uc_mcontext.r8;
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ctx->uc_mcontext.mc_r9 = uc.uc_mcontext.r9;
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ctx->uc_mcontext.mc_rax = uc.uc_mcontext.rax;
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ctx->uc_mcontext.mc_rbx = uc.uc_mcontext.rbx;
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ctx->uc_mcontext.mc_rbp = uc.uc_mcontext.rbp;
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ctx->uc_mcontext.mc_r10 = uc.uc_mcontext.r10;
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ctx->uc_mcontext.mc_r11 = uc.uc_mcontext.r11;
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ctx->uc_mcontext.mc_r12 = uc.uc_mcontext.r12;
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ctx->uc_mcontext.mc_r13 = uc.uc_mcontext.r13;
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ctx->uc_mcontext.mc_r14 = uc.uc_mcontext.r14;
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ctx->uc_mcontext.mc_r15 = uc.uc_mcontext.r15;
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ctx->uc_mcontext.mc_trapno = uc.uc_mcontext.trapno;
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ctx->uc_mcontext.mc_fs = uc.uc_mcontext.fs;
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ctx->uc_mcontext.mc_gs = uc.uc_mcontext.gs;
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ctx->uc_mcontext.mc_flags = uc.uc_mcontext.eflags;
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ctx->uc_mcontext.mc_err = uc.uc_mcontext.err;
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ctx->uc_mcontext.mc_rip = uc.uc_mcontext.rip;
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ctx->uc_mcontext.mc_rsp = uc.uc_mcontext.rsp;
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}
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}
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/*
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* When the FreeBSD kernel invokes this signal handler it pushes a
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* trampoline on the stack which does two things: 1) it calls this
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* function, and 2) calls sys_sigreturn() once this returns.
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*/
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}
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