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commit 3be79b72d556e3ac37075ad6b99eb5eac18e1402
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Author: John David Anglin <danglin@gcc.gnu.org>
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Date: Sun Mar 6 15:56:57 2022 +0000
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Fix elf/tst-audit2 on hppa
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The test elf/tst-audit2 fails on hppa with a segmentation fault in the
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long branch stub used to call malloc from calloc. This occurs because
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the test is not a PIC executable and calloc is called from the dynamic
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linker before the dp register is initialized in _dl_start_user.
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The fix is to move the dp register initialization into
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elf_machine_runtime_setup. Since the address of $global$ can't be
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loaded directly, we continue to use the DT_PLTGOT value from the
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the main_map to initialize dp. Since l_main_map is not available
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in v2.34 and earlier, we use a new function, elf_machine_main_map,
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to find the main map.
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diff --git a/sysdeps/hppa/dl-machine.h b/sysdeps/hppa/dl-machine.h
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index f048fd20728ccde6..24f0f47d8f1e25cd 100644
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--- a/sysdeps/hppa/dl-machine.h
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+++ b/sysdeps/hppa/dl-machine.h
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@@ -27,6 +27,7 @@
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#include <string.h>
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#include <link.h>
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#include <errno.h>
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+#include <ldsodefs.h>
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#include <dl-fptr.h>
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#include <abort-instr.h>
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#include <tls.h>
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@@ -159,6 +160,24 @@ elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
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return (struct fdesc) { value.ip + reloc->r_addend, value.gp };
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}
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+static inline struct link_map *
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+elf_machine_main_map (void)
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+{
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+ struct link_map *main_map;
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+
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+#if defined SHARED && IS_IN (rtld)
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+ asm (
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+" bl 1f,%0\n"
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+" addil L'_rtld_local - ($PIC_pcrel$0 - 1),%0\n"
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+"1: ldw R'_rtld_local - ($PIC_pcrel$0 - 5)(%%r1),%0\n"
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+ : "=r" (main_map) : : "r1");
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+#else
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+ main_map = NULL;
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+#endif
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+
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+ return main_map;
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+}
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+
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/* Set up the loaded object described by L so its unrelocated PLT
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entries will jump to the on-demand fixup code in dl-runtime.c. */
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@@ -174,6 +193,15 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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Elf32_Addr i[2];
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} sig = {{0x00,0xc0,0xff,0xee, 0xde,0xad,0xbe,0xef}};
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+ /* Initialize dp register for main executable. */
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+ if (l == elf_machine_main_map ())
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+ {
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+ register Elf32_Addr dp asm ("%r27");
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+
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+ dp = D_PTR (l, l_info[DT_PLTGOT]);
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+ asm volatile ("" : : "r" (dp));
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+ }
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+
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/* If we don't have a PLT we can just skip all this... */
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if (__builtin_expect (l->l_info[DT_JMPREL] == NULL,0))
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return lazy;
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@@ -336,16 +364,6 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
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its return value is the user program's entry point. */
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#define RTLD_START \
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-/* Set up dp for any non-PIC lib constructors that may be called. */ \
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-static struct link_map * __attribute__((used)) \
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-set_dp (struct link_map *map) \
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-{ \
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- register Elf32_Addr dp asm ("%r27"); \
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- dp = D_PTR (map, l_info[DT_PLTGOT]); \
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- asm volatile ("" : : "r" (dp)); \
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- return map; \
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-} \
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- \
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asm ( \
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" .text\n" \
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" .globl _start\n" \
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@@ -445,14 +463,11 @@ asm ( \
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" stw %r24,-44(%sp)\n" \
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\
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".Lnofix:\n" \
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+ /* Call _dl_init(main_map, argc, argv, envp). */ \
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" addil LT'_rtld_local,%r19\n" \
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" ldw RT'_rtld_local(%r1),%r26\n" \
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-" bl set_dp, %r2\n" \
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" ldw 0(%r26),%r26\n" \
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\
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- /* Call _dl_init(_dl_loaded, argc, argv, envp). */ \
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-" copy %r28,%r26\n" \
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- \
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/* envp = argv + argc + 1 */ \
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" sh2add %r25,%r24,%r23\n" \
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" bl _dl_init,%r2\n" \
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