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From: John David Anglin <danglin@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/release/2.35/master] Fix elf/tst-audit2 on hppa Date: Thu, 3 Mar 2022 21:18:54 +0000 (GMT) [thread overview] Message-ID: <20220303211854.BE759385840B@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=1f770811785e6c79db995b0390d1ef4e67e87d44 commit 1f770811785e6c79db995b0390d1ef4e67e87d44 Author: John David Anglin <danglin@gcc.gnu.org> Date: Mon Feb 14 15:14:49 2022 +0000 Fix elf/tst-audit2 on hppa The test elf/tst-audit2 fails on hppa with a segmentation fault in the long branch stub used to call malloc from calloc. This occurs because the test is not a PIC executable and calloc is called from the dynamic linker before the dp register is initialized in _dl_start_user. The fix is to move the dp register initialization into elf_machine_runtime_setup. Since the address of $global$ can't be loaded directly, we continue to use the DT_PLTGOT value from the the main_map to initialize dp. (cherry picked from commit 2e20cd63c96555d650c525ad5633475e8f11bed4) Diff: --- sysdeps/hppa/dl-machine.h | 24 ++++++++++-------------- 1 file changed, 10 insertions(+), 14 deletions(-) diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h index da4d57d2e4..7b7a697cbb 100644 --- a/sysdeps/hppa/dl-machine.h +++ b/sysdeps/hppa/dl-machine.h @@ -176,6 +176,15 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], Elf32_Addr i[2]; } sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}}; + /* Initialize dp register for main executable. */ + if (l->l_main_map) + { + register Elf32_Addr dp asm ("%r27"); + + dp = D_PTR (l, l_info[DT_PLTGOT]); + asm volatile ("" : : "r" (dp)); + } + /* If we don't have a PLT we can just skip all this... */ if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0)) return lazy; @@ -338,16 +347,6 @@ elf_machine_runtime_setup (struct link_map *l, struct r_scope_elem *scope[], its return value is the user program's entry point. */ #define RTLD_START \ -/* Set up dp for any non-PIC lib constructors that may be called. */ \ -static struct link_map * __attribute__((used)) \ -set_dp (struct link_map *map) \ -{ \ - register Elf32_Addr dp asm ("%r27"); \ - dp = D_PTR (map, l_info[DT_PLTGOT]); \ - asm volatile ("" : : "r" (dp)); \ - return map; \ -} \ - \ asm ( \ " .text\n" \ " .globl _start\n" \ @@ -447,14 +446,11 @@ asm ( \ " stw %r24,-44(%sp)\n" \ \ ".Lnofix:\n" \ + /* Call _dl_init(main_map, argc, argv, envp). */ \ " addil LT'_rtld_local,%r19\n" \ " ldw RT'_rtld_local(%r1),%r26\n" \ -" bl set_dp, %r2\n" \ " ldw 0(%r26),%r26\n" \ \ - /* Call _dl_init(_dl_loaded, argc, argv, envp). */ \ -" copy %r28,%r26\n" \ - \ /* envp = argv + argc + 1 */ \ " sh2add %r25,%r24,%r23\n" \ " bl _dl_init,%r2\n" \
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