d5597ebccc
This patch allows copy relocs for R_386_GOTOFF relocations in PIE. For
extern int glob_a;
int foo ()
{
return glob_a;
}
compiler now can optimize it from
call __x86.get_pc_thunk.ax
addl $_GLOBAL_OFFSET_TABLE_, %eax
movl glob_a@GOT(%eax), %eax
movl (%eax), %eax
ret
to
call __x86.get_pc_thunk.ax
addl $_GLOBAL_OFFSET_TABLE_, %eax
movl glob_a@GOTOFF(%eax), %eax
ret
bfd/
PR ld/18289
* elf32-i386.c (elf_i386_link_hash_entry): Add gotoff_ref.
(elf_i386_link_hash_newfunc): Initialize gotoff_ref to 0.
(elf_i386_create_dynamic_sections): Always allow copy relocs for
building executables.
(elf_i386_copy_indirect_symbol): Also copy gotoff_ref.
(elf_i386_check_relocs): Set gotoff_ref for R_386_GOTOFF.
(elf_i386_adjust_dynamic_symbol): Also allocate copy relocs for
PIE and R_386_GOTOFF.
(elf_i386_relocate_section): Allow R_386_GOTOFF in executable.
ld/testsuite/
PR ld/18289
* ld-i386/copyreloc-lib.c: New file.
* ld-i386/copyreloc-main.S: Likewise.
* ld-i386/copyreloc-main.out: Likewise.
* ld-i386/copyreloc-main1.rd: Likewise.
* ld-i386/copyreloc-main2.rd: Likewise.
* ld-i386/dummy.c: Likewise.
* ld-i386/pr17689.out: Likewise.
* ld-i386/pr17689.rd: Likewise.
* ld-i386/pr17689a.c: Likewise.
* ld-i386/pr17689b.S: Likewise.
* ld-i386/pr17827.rd: Likewise.
* ld-i386/pr17827ver.rd: Likewise.
* ld-i386/i386.exp: Run copyreloc tests.
24 lines
574 B
ArmAsm
24 lines
574 B
ArmAsm
.section .text.startup,"ax",@progbits
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.p2align 4,,15
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.globl main
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.type main, @function
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main:
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.cfi_startproc
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call __x86.get_pc_thunk.ax
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addl $_GLOBAL_OFFSET_TABLE_, %eax
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cmpl $2, a_glob@GOTOFF(%eax)
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setne %al
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movzbl %al, %eax
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ret
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.cfi_endproc
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.size main, .-main
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.section .text.__x86.get_pc_thunk.ax,"axG",@progbits,__x86.get_pc_thunk.ax,comdat
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.globl __x86.get_pc_thunk.ax
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.hidden __x86.get_pc_thunk.ax
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.type __x86.get_pc_thunk.ax, @function
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__x86.get_pc_thunk.ax:
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.cfi_startproc
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movl (%esp), %eax
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ret
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.cfi_endproc
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.section .note.GNU-stack,"",@progbits
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