diff options
| -rw-r--r-- | gcc/config/rs6000/rs6000.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/gcc/config/rs6000/rs6000.h b/gcc/config/rs6000/rs6000.h index 55f52cb6b24..2a7ddf6f4ed 100644 --- a/gcc/config/rs6000/rs6000.h +++ b/gcc/config/rs6000/rs6000.h @@ -1151,6 +1151,27 @@ struct rs6000_args {int words, fregno, nargs_prototype; }; force_reg (SImode, (CXT))); \ } +/* Definitions for __builtin_return_address and __builtin_frame_address. + __builtin_return_address (0) should give link register (65), enable + this. */ +/* This should be uncommented, so that the link register is used, but + currently this would result in unmatched insns and spilling fixed + registers so we'll leave it for another day. When these problems are + taken care of one additional fetch will be necessary in RETURN_ADDR_RTX. + (mrs) */ +/* #define RETURN_ADDR_IN_PREVIOUS_FRAME */ +/* The current return address is in link register (65). The return address + of anything farther back is accessed normally at an offset of 8 from the + frame pointer. */ +#define RETURN_ADDR_RTX(count, frame) \ + ((count == -1) \ + ? gen_rtx (REG, Pmode, 65) \ + : copy_to_reg (gen_rtx (MEM, Pmode, \ + memory_address (Pmode, \ + plus_constant (copy_to_reg (gen_rtx (MEM, Pmode, \ + memory_address (Pmode, frame))), \ + 8))))) + /* Definitions for register eliminations. We have two registers that can be eliminated on the RS/6000. First, the |