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Introduce --strace flag for system call tracing
This is similar to the --ftrace (c function call trace) flag, except
it's less noisy since it only logs system calls to stderr. Having this
flag is valuable because (1) system call tracing tells us a lot about
the behavior of complex programs and (2) it's usually very hard to get
system call tracing on various operating systems, e.g. strace, ktrace,
dtruss, truss, nttrace, etc. Especially on Apple platforms where even
with the special boot trick, debuggers still aren't guaranteed to work.
make -j8 o//examples
o//examples/hello.com --strace
This is enabled by default in MODE=, MODE=opt, and MODE=dbg. In MODE=dbg
extra information will be printed.
make -j8 MODE=dbg o/dbg/examples
o/dbg/examples/hello.com --strace |& less
This change also changes:
- Rename IsText() → _istext()
- Rename IsUtf8() → _isutf8()
- Fix madvise() on Windows NT
- Fix empty string case of inet_ntop()
- vfork() wrapper now saves and restores errno
- Update xsigaction() to yoink syscall support
This commit is contained in:
Justine Tunney
parent
c541225af0
commit
14e192e5ba
138 changed files with 1519 additions and 631 deletions
37
libc/sysv/describeos.greg.c
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37
libc/sysv/describeos.greg.c
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@ -0,0 +1,37 @@
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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 2020 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/dce.h"
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const char *__describe_os(void) {
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if (IsLinux()) {
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return "gnu/systemd";
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} else if (IsXnu()) {
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return "xnu's not unix!";
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} else if (IsFreebsd()) {
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return "free besiyata dishmaya";
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} else if (IsNetbsd()) {
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return "net besiyata dishmaya";
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} else if (IsOpenbsd()) {
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return "open besiyata dishmaya";
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} else if (IsWindows()) {
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return "the new technology";
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} else {
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return "wut";
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}
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}
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21
libc/sysv/strace.greg.c
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21
libc/sysv/strace.greg.c
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@ -0,0 +1,21 @@
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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/strace.internal.h"
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int __strace;
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@ -16,13 +16,14 @@
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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/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/macros.internal.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/nexgen32e/macros.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/consts/prot.h"
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/* ▄▄▄
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▄▄▄ ▀▓▓▒▄
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@ -306,8 +307,29 @@ _init_systemfive_magnums:
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jnz 3b
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xchg %rbx,%rax
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stosq
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#ifdef SYSDEBUG
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inc %r8d
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#endif
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jmp 2b
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5: pop %rdi
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5: nop
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#ifdef SYSDEBUG
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push %rdi
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push %rsi
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push %r8
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call __describe_os
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mov %rax,%rdx
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pop %r8
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.weak __stracef
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ezlea __stracef,ax
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test %rax,%rax
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jz 5f
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ezlea .Llog,di
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mov %r8d,%esi
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call *%rax
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5: pop %rsi
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pop %rdi
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#endif /* DEBUGSYS */
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pop %rdi
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pop %rsi
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pop %rbx
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// 𝑠𝑙𝑖𝑑𝑒
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@ -325,8 +347,12 @@ _init_systemfive_pid:
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.endfn _init_systemfive_pid
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#endif
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#if SupportsSystemv() && !defined(TINY)
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_init_systemfive_stack: # determinism ftw!
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#if SupportsWindows() || SupportsMetal()
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// Create a stack with deterministic readable addresses.
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// If ape_execve() already created us a stack that meets
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// the requirements of STATIC_STACK_SIZE() then we skip.
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_init_systemfive_stack:
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#if SupportsWindows() || SupportsMetal() || SupportsOpenbsd()
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testb $WINDOWS|METAL,__hostos(%rip)
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jnz _init_systemfive_done
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#endif
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@ -512,6 +538,14 @@ syscon_windows:/*
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.globl syscon_windows
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#endif
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#ifdef SYSDEBUG
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.rodata.str1.1
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.Llog: .ascii STRACE_PROLOGUE
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.ascii "bell system five system call support"
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.asciz " %'u magnums loaded on %s%n"
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.previous
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#endif /* DEBUGSYS */
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.weak ape_stack_vaddr
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.weak ape_stack_memsz
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.weak ape_stack_align
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@ -22,6 +22,7 @@ LIBC_SYSV_ARTIFACTS += LIBC_SYSV_A
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LIBC_SYSV_A = o/$(MODE)/libc/sysv/sysv.a
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LIBC_SYSV_A_HDRS = $(filter %.h,$(LIBC_SYSV_A_FILES))
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LIBC_SYSV_A_INCS = $(filter %.inc,$(LIBC_SYSV_A_FILES))
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LIBC_SYSV_A_SRCS_C = $(filter %.c,$(LIBC_SYSV_A_FILES))
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LIBC_SYSV_A_SRCS_A = $(filter %.s,$(LIBC_SYSV_A_FILES))
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LIBC_SYSV_A_SRCS_S = $(filter %.S,$(LIBC_SYSV_A_FILES))
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LIBC_SYSV_A_CHECKS = $(LIBC_SYSV_A).pkg
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@ -36,15 +37,19 @@ LIBC_SYSV_A_FILES := \
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libc/sysv/restorert.S \
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libc/sysv/syscall.S \
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libc/sysv/systemfive.S \
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libc/sysv/strace.greg.c \
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libc/sysv/describeos.greg.c \
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$(wildcard libc/sysv/consts/*) \
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$(wildcard libc/sysv/errfuns/*)
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LIBC_SYSV_A_SRCS = \
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$(LIBC_SYSV_A_SRCS_A) \
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$(LIBC_SYSV_A_SRCS_C) \
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$(LIBC_SYSV_A_SRCS_S)
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LIBC_SYSV_A_OBJS = \
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$(LIBC_SYSV_A_SRCS_A:%.s=o/$(MODE)/%.o) \
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$(LIBC_SYSV_A_SRCS_C:%.c=o/$(MODE)/%.o) \
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$(LIBC_SYSV_A_SRCS_S:%.S=o/$(MODE)/%.o)
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LIBC_SYSV_A_DEPS := \
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