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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
160
libc/calls/mman.greg.c
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160
libc/calls/mman.greg.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 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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│░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░│
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│░░░░░░░▀▀▀░▀░▀░▀▀▀░▀▀▀░▀▀▀░░▀░░▀░▀░▀▀▀░▀▀░▀▀▀░░░░░░░░░░▄██▀█▌░██▄▄░░▐█▀▄░▐█▀░░│
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│░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░▐█▀▀▌░░░▄▀▌░▌░█░▌░░▌░▌░░│
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╠──────────────────────────────────────────────────────▌▀▄─▐──▀▄─▐▄─▐▄▐▄─▐▄─▐▄─│
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│ αcτµαlly pδrταblε εxεcµταblε § no-frills virtual memory management │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "ape/relocations.h"
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#include "libc/elf/def.h"
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#include "libc/elf/struct/phdr.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/uart.internal.h"
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#include "libc/runtime/e820.internal.h"
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#include "libc/runtime/metalprintf.internal.h"
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#include "libc/runtime/pc.internal.h"
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#include "libc/runtime/runtime.h"
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/**
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* Allocates new page of physical memory.
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*/
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noasan texthead uint64_t __new_page(struct mman *mm) {
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uint64_t p;
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if (mm->pdpi == mm->e820n) {
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/* TODO: reclaim free pages */
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return 0;
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}
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while (mm->pdp >= mm->e820[mm->pdpi].addr + mm->e820[mm->pdpi].size) {
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if (++mm->pdpi == mm->e820n) return 0;
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mm->pdp = mm->e820[mm->pdpi].addr;
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}
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p = mm->pdp;
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mm->pdp += 4096;
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return p;
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}
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/**
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* Returns pointer to page table entry for page at virtual address.
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* Additional page tables are allocated if needed as a side-effect.
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*/
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noasan texthead uint64_t *__get_virtual(struct mman *mm, uint64_t *t,
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int64_t vaddr, bool maketables) {
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uint64_t *e, p;
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unsigned char h;
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for (h = 39;; h -= 9) {
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e = t + ((vaddr >> h) & 511);
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if (h == 12) return e;
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if (!(*e & PAGE_V)) {
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if (!maketables) return NULL;
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if (!(p = __new_page(mm))) return NULL;
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*e = p | PAGE_V | PAGE_RW;
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}
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t = (uint64_t *)(BANE + (*e & PAGE_TA));
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}
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}
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/**
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* Sorts, rounds, and filters BIOS memory map.
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*/
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static noasan texthead void __normalize_e820(struct mman *mm) {
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uint64_t a, b;
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uint64_t x, y;
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unsigned i, j, n;
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for (n = i = 0; mm->e820[i].size; ++i) {
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mm->e820[n] = mm->e820[i];
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x = mm->e820[n].addr;
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y = mm->e820[n].addr + mm->e820[n].size;
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a = ROUNDUP(x, 4096);
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b = ROUNDDOWN(y, 4096) - a;
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if (b > 0 && mm->e820[i].type == kMemoryUsable) {
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mm->e820[n].addr = a;
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mm->e820[n].size = b;
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++n;
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}
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}
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for (i = 1; i < n; ++i) {
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for (j = i; j > 0 && mm->e820[i].addr < mm->e820[j - 1].addr; --j) {
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mm->e820[j] = mm->e820[j - 1];
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}
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mm->e820[j] = mm->e820[i];
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}
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mm->pdp = MAX(0x80000, mm->e820[0].addr);
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mm->pdpi = 0;
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mm->e820n = n;
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}
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/**
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* Identity maps all usable physical memory to its negative address.
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*/
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static noasan texthead void __invert_memory(struct mman *mm, uint64_t *pml4t) {
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uint64_t i, j, *m, p, pe;
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for (i = 0; i < mm->e820n; ++i) {
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for (p = mm->e820[i].addr, pe = mm->e820[i].addr + mm->e820[i].size;
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p + 0x200000 < pe; p += 4096) {
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m = __get_virtual(mm, pml4t, BANE + p, true);
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if (m && !(*m & PAGE_V)) {
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*m = p | PAGE_V | PAGE_RW;
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}
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}
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}
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}
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noasan texthead void __setup_mman(struct mman *mm, uint64_t *pml4t) {
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__normalize_e820(mm);
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__invert_memory(mm, pml4t);
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}
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/**
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* Maps APE-defined ELF program headers into memory and clears BSS.
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*/
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noasan textreal void __map_phdrs(struct mman *mm, uint64_t *pml4t, uint64_t b) {
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struct Elf64_Phdr *p;
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uint64_t i, f, v, m, *e;
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extern char ape_phdrs[] __attribute__((__weak__));
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extern char ape_phdrs_end[] __attribute__((__weak__));
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__setup_mman(mm, pml4t);
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for (p = (struct Elf64_Phdr *)REAL(ape_phdrs), m = 0;
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p < (struct Elf64_Phdr *)REAL(ape_phdrs_end); ++p) {
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if (p->p_type == PT_LOAD || p->p_type == PT_GNU_STACK) {
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f = PAGE_V | PAGE_U;
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if (p->p_flags & PF_W) f |= PAGE_RW;
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for (i = 0; i < p->p_memsz; i += 4096) {
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if (i < p->p_filesz) {
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v = b + p->p_offset + i;
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m = MAX(m, v);
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} else {
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v = __clear_page(__new_page(mm));
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}
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*__get_virtual(mm, pml4t, p->p_vaddr + i, true) = (v & PAGE_TA) | f;
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}
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}
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}
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mm->pdp = MAX(mm->pdp, m);
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}
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