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e16a7d8f3b
`et` means `expandtab`. ```sh rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\) :vi/vi: \1 xoet\2:vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2 :vi/' rg 'vi: .* :vi' -l -0 | \ xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/' ```
113 lines
4.3 KiB
C
113 lines
4.3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2023 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/struct/sigaction.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/struct/sigset.h"
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#include "libc/calls/ucontext.h"
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#include "libc/dce.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/sysconf.h"
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#include "libc/sysv/consts/auxv.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sicode.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/testlib/testlib.h"
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#include "third_party/xed/x86.h"
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volatile int gotsig;
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volatile int gotcode;
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void SetUpOnce(void) {
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testlib_enable_tmp_setup_teardown();
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}
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void SetUp(void) {
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gotsig = 0;
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}
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void OnSig(int sig, siginfo_t *si, void *arg) {
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ucontext_t *ctx = arg;
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gotsig = sig;
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gotcode = si->si_code;
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#ifdef __aarch64__
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ctx->uc_mcontext.pc += 4;
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#elif defined(__x86_64__)
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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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#else
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#error "unsupported architecture"
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#endif /* __x86_64__ */
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}
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TEST(sigbus, test) {
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if (IsWindows()) {
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// TODO(jart): Just write a kernel style memory manager from scratch
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// for WIN32 and don't depend on their mapping functions
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return;
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}
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// create a file with less than one page of content
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ASSERT_SYS(0, 3, open("foo", O_CREAT | O_RDWR, 0666));
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ASSERT_SYS(0, 2, write(3, "hi", 2));
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// map two pages of the file into memory
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char *map;
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long pagesz = getauxval(AT_PAGESZ);
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ASSERT_NE(MAP_FAILED,
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(map = mmap(0, pagesz * 2, PROT_READ, MAP_PRIVATE, 3, 0)));
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// verify the file content is there
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ASSERT_EQ('h', map[0]);
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ASSERT_EQ('i', map[1]);
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// memory reads past file eof on first page get zero-filled
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ASSERT_EQ(0, map[2]);
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// listen for sigbus
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struct sigaction sa;
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struct sigaction oldsa;
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sa.sa_flags = SA_SIGINFO;
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sa.sa_sigaction = OnSig;
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sigemptyset(&sa.sa_mask);
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sigaction(SIGBUS, &sa, &oldsa);
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// memory reads past file eof on subsequent pages cause page fault to sigbus
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volatile char x = map[pagesz];
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(void)x;
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// verify the signal was raised
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EXPECT_EQ(SIGBUS, gotsig);
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if (IsXnuSilicon()) {
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// TODO: Why does it say it's an alignment error?
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EXPECT_EQ(BUS_ADRALN, gotcode);
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} else {
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EXPECT_EQ(BUS_ADRERR, gotcode);
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}
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// clean up
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sigaction(SIGBUS, &oldsa, 0);
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munmap(map, pagesz * 2);
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}
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