[binutils-gdb] LoongArch: gas: Adjust DWARF CIE alignment factors

[liu & zhensong]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=de203ed568f670387d2870c13dc4cae9e30f3f8b

commit de203ed568f670387d2870c13dc4cae9e30f3f8b
Author: mengqinggang <mengqinggang@loongson.cn>
Date:   Mon Apr 29 15:11:31 2024 +0800

    LoongArch: gas: Adjust DWARF CIE alignment factors
    
    Set DWARF2_CIE_DATA_ALIGNMENT (data alignment factors) to -8.
    It helps to save space.
    
    Data Alignment Factor
    A signed LEB128 encoded value that is factored out of all offset
    instructions that are associated with this CIE or its FDEs. This value
    shall be multiplied by the register offset argument of an offset
    instruction to obtain the new offset value.

Diff:
---
 gas/config/tc-loongarch.h | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/gas/config/tc-loongarch.h b/gas/config/tc-loongarch.h
index e1ef42c1314..f53e3584c7c 100644
--- a/gas/config/tc-loongarch.h
+++ b/gas/config/tc-loongarch.h
@@ -99,15 +99,19 @@ extern bool loongarch_frag_align_code (int, int);
 
 #define TC_FORCE_RELOCATION_LOCAL(FIX) 1
 
-/* Adjust debug_line after relaxation.  */
-#define DWARF2_USE_FIXED_ADVANCE_PC 1
-
 /* Values passed to md_apply_fix don't include symbol values.  */
 #define MD_APPLY_SYM_VALUE(FIX) 0
 
 #define TARGET_USE_CFIPOP 1
-#define DWARF2_DEFAULT_RETURN_COLUMN 1 /* $ra.  */
-#define DWARF2_CIE_DATA_ALIGNMENT -4
+/* Adjust debug_line after relaxation.  */
+#define DWARF2_USE_FIXED_ADVANCE_PC   1
+
+/* FDE Data Alignment Factor.
+   FDE Code Alignment Factor (DWARF2_LINE_MIN_INSN_LENGTH) should be 1
+   because DW_CFA_advance_loc need to be relocated in bytes
+   when linker relaxation.  */
+#define DWARF2_CIE_DATA_ALIGNMENT     (-8)
+#define DWARF2_DEFAULT_RETURN_COLUMN  1	    /* FDE Return Address Register.  */
 
 #define tc_cfi_frame_initial_instructions	\
   loongarch_cfi_frame_initial_instructions