diff options
Diffstat (limited to 'sysdeps/x86_64/sysdep.h')
| -rw-r--r-- | sysdeps/x86_64/sysdep.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sysdeps/x86_64/sysdep.h b/sysdeps/x86_64/sysdep.h index e652171064..e79a3974fd 100644 --- a/sysdeps/x86_64/sysdep.h +++ b/sysdeps/x86_64/sysdep.h @@ -25,6 +25,13 @@ /* Syntactic details of assembler. */ +/* This macro is for setting proper CFI with DW_CFA_expression describing + the register as saved relative to %rsp instead of relative to the CFA. + Expression is DW_OP_drop, DW_OP_breg7 (%rsp is register 7), sleb128 offset + from %rsp. */ +#define cfi_offset_rel_rsp(regn, off) .cfi_escape 0x10, regn, 0x4, 0x13, \ + 0x77, off & 0x7F | 0x80, off >> 7 + /* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ #define ALIGNARG(log2) 1<<log2 #define ASM_SIZE_DIRECTIVE(name) .size name,.-name; |