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Improve signal handling and math

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- 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 2021-02-25 18:30:17 -08:00
parent cdc54ea1fd
commit 40291c9db3
109 changed files with 2316 additions and 520 deletions
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48
test/libc/calls/sigaction_test.c
View file

@ -19,12 +19,17 @@
#include "libc/calls/calls.h"
#include "libc/calls/sigbits.h"
#include "libc/calls/struct/sigaction.h"
#include "libc/calls/struct/siginfo.h"
#include "libc/calls/ucontext.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/runtime/runtime.h"
#include "libc/sysv/consts/sa.h"
#include "libc/sysv/consts/sig.h"
#include "libc/testlib/testlib.h"
#include "third_party/xed/x86.h"
struct sigaction oldsa;
volatile bool gotsigint;
@ -34,12 +39,11 @@ void OnSigInt(int sig) {
void SetUp(void) {
gotsigint = false;
/* TODO(jart): Windows needs huge signal overhaul */
if (IsWindows()) exit(0);
}
TEST(sigaction, test) {
/* TODO(jart): Why does RHEL5 behave differently? */
/* TODO(jart): Windows needs huge signal overhaul */
if (IsWindows()) return;
int pid, status;
sigset_t block, ignore, oldmask;
struct sigaction saint = {.sa_handler = OnSigInt};
@ -48,7 +52,7 @@ TEST(sigaction, test) {
EXPECT_NE(-1, sigprocmask(SIG_BLOCK, &block, &oldmask));
sigfillset(&ignore);
sigdelset(&ignore, SIGINT);
EXPECT_NE(-1, sigaction(SIGINT, &saint, NULL));
EXPECT_NE(-1, sigaction(SIGINT, &saint, &oldsa));
ASSERT_NE(-1, (pid = fork()));
if (!pid) {
EXPECT_NE(-1, kill(getppid(), SIGINT));
@ -64,13 +68,45 @@ TEST(sigaction, test) {
EXPECT_EQ(0, WEXITSTATUS(status));
EXPECT_EQ(0, WTERMSIG(status));
EXPECT_NE(-1, sigprocmask(SIG_SETMASK, &oldmask, NULL));
EXPECT_NE(-1, sigaction(SIGINT, &oldsa, NULL));
}
TEST(sigaction, raise) {
if (IsWindows()) return;
struct sigaction saint = {.sa_handler = OnSigInt};
EXPECT_NE(-1, sigaction(SIGINT, &saint, NULL));
EXPECT_NE(-1, sigaction(SIGINT, &saint, &oldsa));
ASSERT_FALSE(gotsigint);
EXPECT_NE(-1, raise(SIGINT));
ASSERT_TRUE(gotsigint);
EXPECT_NE(-1, sigaction(SIGINT, &oldsa, NULL));
}
volatile int trapeax;
void OnTrap(int sig, struct siginfo *si, struct ucontext *ctx) {
trapeax = ctx->uc_mcontext.rax;
}
TEST(sigaction, debugBreak_handlerCanReadCpuState) {
struct sigaction saint = {.sa_sigaction = OnTrap, .sa_flags = SA_SIGINFO};
EXPECT_NE(-1, sigaction(SIGTRAP, &saint, &oldsa));
asm("int3" : /* no outputs */ : "a"(0x31337));
EXPECT_EQ(0x31337, trapeax);
EXPECT_NE(-1, sigaction(SIGTRAP, &oldsa, NULL));
}
void OnFpe(int sig, struct siginfo *si, struct ucontext *ctx) {
struct XedDecodedInst xedd;
xed_decoded_inst_zero_set_mode(&xedd, XED_MACHINE_MODE_LONG_64);
xed_instruction_length_decode(&xedd, (void *)ctx->uc_mcontext.rip, 15);
ctx->uc_mcontext.rip += xedd.length;
ctx->uc_mcontext.rax = 42;
ctx->uc_mcontext.rdx = 0;
}
TEST(sigaction, sigFpe_handlerCanEditProcessStateAndRecoverExecution) {
struct sigaction saint = {.sa_sigaction = OnFpe, .sa_flags = SA_SIGINFO};
EXPECT_NE(-1, sigaction(SIGFPE, &saint, &oldsa));
volatile long x = 0;
EXPECT_EQ(42, 666 / x); /* systems engineering trumps math */
EXPECT_NE(-1, sigaction(SIGFPE, &oldsa, NULL));
}