Add <link.h> for absl

Author: jart

ape/ape.S

@@ -752,6 +752,8 @@ ape_loader_end:
 #if SupportsSystemv() || SupportsMetal()
 	.section .elf.phdrs,"a",@progbits
 
+	.globl	ape_phdrs
+ape_phdrs:
 	.long	PT_LOAD
 	.long	PF_R|PF_X
 	.stub	ape_cod_offset,quad

ape/sections.internal.h

@@ -22,6 +22,7 @@ extern uint8_t __data_start[] __attribute__((__weak__));
 extern uint8_t __data_end[] __attribute__((__weak__));
 extern uint8_t __bss_start[] __attribute__((__weak__));
 extern uint8_t __bss_end[] __attribute__((__weak__));
+extern unsigned char ape_phdrs[] __attribute__((__weak__));
 
 COSMOPOLITAN_C_END_
 #endif /* COSMOPOLITAN_APE_SECTIONS_INTERNAL_H_ */

libc/calls/dl_iterate_phdr.c

@@ -0,0 +1,33 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8                               :vi │
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2023 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "ape/sections.internal.h"
+#include "libc/elf/link.h"
+#include "libc/runtime/runtime.h"
+
+int dl_iterate_phdr(int callback(struct dl_phdr_info *info, size_t size,
+                                 void *data),
+                    void *data) {
+  struct dl_phdr_info info = {
+      .dlpi_addr = (uintptr_t)__executable_start,
+      .dlpi_name = GetProgramExecutableName(),
+      .dlpi_phdr = (const Elf64_Phdr *)ape_phdrs,
+      .dlpi_phnum = 3,
+  };
+  return callback(&info, sizeof(info), data);
+}

libc/elf/link.h

@@ -0,0 +1,40 @@
+#ifndef COSMOPOLITAN_ELF_LINK_H_
+#define COSMOPOLITAN_ELF_LINK_H_
+#include "libc/elf/scalar.h"
+#include "libc/elf/struct/dyn.h"
+#include "libc/elf/struct/phdr.h"
+COSMOPOLITAN_C_START_
+
+#define ElfW(type) Elf64_##type
+
+struct dl_phdr_info {
+  Elf64_Addr dlpi_addr;
+  const char *dlpi_name;
+  const Elf64_Phdr *dlpi_phdr;
+  Elf64_Half dlpi_phnum;
+  unsigned long long int dlpi_adds;
+  unsigned long long int dlpi_subs;
+  size_t dlpi_tls_modid;
+  void *dlpi_tls_data;
+};
+
+struct link_map {
+  Elf64_Addr l_addr;
+  char *l_name;
+  Elf64_Dyn *l_ld;
+  struct link_map *l_next;
+  struct link_map *l_prev;
+};
+
+struct r_debug {
+  int r_version;
+  struct link_map *r_map;
+  Elf64_Addr r_brk;
+  enum { RT_CONSISTENT, RT_ADD, RT_DELETE } r_state;
+  Elf64_Addr r_ldbase;
+};
+
+int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *), void *);
+
+COSMOPOLITAN_C_END_
+#endif /* COSMOPOLITAN_ELF_LINK_H_ */

libc/isystem/link.h

@@ -0,0 +1,23 @@
+#ifndef _LINK_H
+#define _LINK_H
+#include "libc/elf/def.h"
+#include "libc/elf/link.h"
+#include "libc/elf/scalar.h"
+#include "libc/elf/struct/auxv.h"
+#include "libc/elf/struct/chdr.h"
+#include "libc/elf/struct/dyn.h"
+#include "libc/elf/struct/ehdr.h"
+#include "libc/elf/struct/lib.h"
+#include "libc/elf/struct/move.h"
+#include "libc/elf/struct/nhdr.h"
+#include "libc/elf/struct/phdr.h"
+#include "libc/elf/struct/rel.h"
+#include "libc/elf/struct/rela.h"
+#include "libc/elf/struct/shdr.h"
+#include "libc/elf/struct/sym.h"
+#include "libc/elf/struct/syminfo.h"
+#include "libc/elf/struct/verdaux.h"
+#include "libc/elf/struct/verdef.h"
+#include "libc/elf/struct/vernaux.h"
+#include "libc/elf/struct/verneed.h"
+#endif /* _LINK_H */