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LoongArch: gas: Relocations simplification when -mno-relax

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Gas does not emit ADD/SUB relocation pairs for label differences
  when -mno-relax.
This commit is contained in:
mengqinggang 2023-06-02 17:24:10 +08:00 committed by liuzhensong
parent 26d812a2aa
commit 55e1609e53
2 changed files with 26 additions and 9 deletions
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11
gas/config/tc-loongarch.c
View File

@ -915,8 +915,9 @@ append_fixp_and_insn (struct loongarch_cl_insn *ip)
symbol is not in the same frag, it will generate relocs to calculate
symbol subtraction. (gas/dw2gencfi.c:output_cfi_insn:
if (symbol_get_frag (to) == symbol_get_frag (from))) */
if (BFD_RELOC_LARCH_PCALA_HI20 == reloc_info[0].type
|| BFD_RELOC_LARCH_GOT_PC_HI20 == reloc_info[0].type)
if (LARCH_opts.relax
&& (BFD_RELOC_LARCH_PCALA_HI20 == reloc_info[0].type
|| BFD_RELOC_LARCH_GOT_PC_HI20 == reloc_info[0].type))
{
frag_wane (frag_now);
frag_new (0);
@ -1470,6 +1471,9 @@ loongarch_pre_output_hook (void)
const frchainS *frch;
segT s;
if (!LARCH_opts.relax)
return;
/* Save the current segment info. */
segT seg = now_seg;
subsegT subseg = now_subseg;
@ -1665,7 +1669,8 @@ loongarch_md_finish (void)
{
/* Insert relocations for uleb128 directives, so the values can be recomputed
at link time. */
bfd_map_over_sections (stdoutput, loongarch_insert_uleb128_fixes, NULL);
if (LARCH_opts.relax)
bfd_map_over_sections (stdoutput, loongarch_insert_uleb128_fixes, NULL);
}
void

24
gas/config/tc-loongarch.h
View File

@ -21,6 +21,8 @@
#ifndef TC_LOONGARCH
#define TC_LOONGARCH
#include "opcode/loongarch.h"
#define TARGET_BYTES_BIG_ENDIAN 0
#define TARGET_ARCH bfd_arch_loongarch
@ -57,23 +59,33 @@ extern bool loongarch_frag_align_code (int);
/* The following two macros let the linker resolve all the relocs
due to relaxation.
This is called to see whether a reloc against a defined symbol
should be converted into a reloc against a section. */
should be converted into a reloc against a section.
If relax and norelax have different value may cause ld ".eh_frame_hdr
refers to overlapping FDEs" error when link relax .o and norelax .o. */
#define tc_fix_adjustable(fixp) 0
/* The difference between same-section symbols may be affected by linker
/* Tne difference between same-section symbols may be affected by linker
relaxation, so do not resolve such expressions in the assembler. */
#define md_allow_local_subtract(l,r,s) 0
/* Values passed to md_apply_fix don't include symbol values. */
#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) 1
#define TC_VALIDATE_FIX_SUB(FIX, SEG) 1
#define DIFF_EXPR_OK 1
/* Postpone text-section label subtraction calculation until linking, since
linker relaxations might change the deltas. */
#define TC_FORCE_RELOCATION_SUB_SAME(FIX, SEC) \
(GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC) \
|| ((SEC)->flags & SEC_CODE) != 0 \
|| ((SEC)->flags & SEC_DEBUGGING) != 0 \
|| TC_FORCE_RELOCATION (FIX))
(LARCH_opts.relax ? \
(GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC) \
|| ((SEC)->flags & SEC_CODE) != 0 \
|| ((SEC)->flags & SEC_DEBUGGING) != 0 \
|| TC_FORCE_RELOCATION (FIX)) \
: (GENERIC_FORCE_RELOCATION_SUB_SAME (FIX, SEC))) \
#define TC_LINKRELAX_FIXUP(seg) ((seg->flags & SEC_CODE) \
|| (seg->flags & SEC_DEBUGGING))