From 23c35173490ac2d6348a668dfc9c1a6eb62171f2 Mon Sep 17 00:00:00 2001 From: "Edgar E. Iglesias" Date: Mon, 18 Jun 2012 20:18:13 +0200 Subject: [PATCH] [Patch, microblaze]: Enable DWARF exception handling support. Changelog 2013-03-18 Edgar E. Iglesias David Holsgrove * common/config/microblaze/microblaze-common.c: Remove TARGET_EXCEPT_UNWIND_INFO definition. * config/microblaze/microblaze-protos.h: Add microblaze_eh_return prototype. * gcc/config/microblaze/microblaze.c: (microblaze_must_save_register, microblaze_expand_epilogue, microblaze_return_addr): Handle calls_eh_return (microblaze_eh_return): New function. * gcc/config/microblaze/microblaze.h: Define RETURN_ADDR_OFFSET, EH_RETURN_DATA_REGNO, MB_EH_STACKADJ_REGNUM, EH_RETURN_STACKADJ_RTX, ASM_PREFERRED_EH_DATA_FORMAT * gcc/config/microblaze/microblaze.md: Define eh_return pattern. Signed-off-by: David Holsgrove Signed-off-by: Edgar E. Iglesias --- Fetched from Xilinx gcc git at https://github.com/Xilinx/gcc --- gcc/common/config/microblaze/microblaze-common.c | 3 --- gcc/config/microblaze/microblaze-protos.h | 1 + gcc/config/microblaze/microblaze.c | 29 ++++++++++++++++++++---- gcc/config/microblaze/microblaze.h | 15 ++++++++++++ gcc/config/microblaze/microblaze.md | 11 +++++++++ 5 files changed, 52 insertions(+), 7 deletions(-) Index: b/gcc/common/config/microblaze/microblaze-common.c =================================================================== --- a/gcc/common/config/microblaze/microblaze-common.c +++ b/gcc/common/config/microblaze/microblaze-common.c @@ -37,7 +37,4 @@ #undef TARGET_OPTION_OPTIMIZATION_TABLE #define TARGET_OPTION_OPTIMIZATION_TABLE microblaze_option_optimization_table -#undef TARGET_EXCEPT_UNWIND_INFO -#define TARGET_EXCEPT_UNWIND_INFO sjlj_except_unwind_info - struct gcc_targetm_common targetm_common = TARGETM_COMMON_INITIALIZER; Index: b/gcc/config/microblaze/microblaze-protos.h =================================================================== --- a/gcc/config/microblaze/microblaze-protos.h +++ b/gcc/config/microblaze/microblaze-protos.h @@ -56,6 +56,7 @@ extern int symbol_mentioned_p (rtx); extern int label_mentioned_p (rtx); extern bool microblaze_cannot_force_const_mem (machine_mode, rtx); +extern void microblaze_eh_return (rtx op0); #endif /* RTX_CODE */ /* Declare functions in microblaze-c.c. */ Index: b/gcc/config/microblaze/microblaze.c =================================================================== --- a/gcc/config/microblaze/microblaze.c +++ b/gcc/config/microblaze/microblaze.c @@ -1959,6 +1959,11 @@ if (frame_pointer_needed && (regno == HARD_FRAME_POINTER_REGNUM)) return 1; + if (crtl->calls_eh_return + && regno == MB_ABI_SUB_RETURN_ADDR_REGNUM) { + return 1; + } + if (!crtl->is_leaf) { if (regno == MB_ABI_SUB_RETURN_ADDR_REGNUM) @@ -1986,6 +1991,13 @@ return 1; } + if (crtl->calls_eh_return + && (regno == EH_RETURN_DATA_REGNO (0) + || regno == EH_RETURN_DATA_REGNO (1))) + { + return 1; + } + return 0; } @@ -3067,6 +3079,12 @@ emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx, fsiz_rtx)); } + if (crtl->calls_eh_return) + emit_insn (gen_addsi3 (stack_pointer_rtx, + stack_pointer_rtx, + gen_rtx_raw_REG (SImode, + MB_EH_STACKADJ_REGNUM))); + emit_jump_insn (gen_return_internal (gen_rtx_REG (Pmode, GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM))); } @@ -3364,10 +3382,13 @@ if (count != 0) return NULL_RTX; - return gen_rtx_PLUS (Pmode, - get_hard_reg_initial_val (Pmode, - MB_ABI_SUB_RETURN_ADDR_REGNUM), - GEN_INT (8)); + return get_hard_reg_initial_val (Pmode, + MB_ABI_SUB_RETURN_ADDR_REGNUM); +} + +void microblaze_eh_return (rtx op0) +{ + emit_insn (gen_movsi(gen_rtx_MEM(Pmode, stack_pointer_rtx), op0)); } /* Queue an .ident string in the queue of top-level asm statements. Index: b/gcc/config/microblaze/microblaze.h =================================================================== --- a/gcc/config/microblaze/microblaze.h +++ b/gcc/config/microblaze/microblaze.h @@ -184,6 +184,21 @@ #define INCOMING_RETURN_ADDR_RTX \ gen_rtx_REG (VOIDmode, GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM) +/* Specifies the offset from INCOMING_RETURN_ADDR_RTX and the actual return PC. */ +#define RETURN_ADDR_OFFSET (8) + +/* Describe how we implement __builtin_eh_return. */ +#define EH_RETURN_DATA_REGNO(N) (((N) < 2) ? MB_ABI_FIRST_ARG_REGNUM + (N) : INVALID_REGNUM) + +#define MB_EH_STACKADJ_REGNUM MB_ABI_INT_RETURN_VAL2_REGNUM +#define EH_RETURN_STACKADJ_RTX gen_rtx_REG (Pmode, MB_EH_STACKADJ_REGNUM) + +/* Select a format to encode pointers in exception handling data. CODE + is 0 for data, 1 for code labels, 2 for function pointers. GLOBAL is + true if the symbol may be affected by dynamic relocations. */ +#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL) \ + ((flag_pic || GLOBAL) ? DW_EH_PE_aligned : DW_EH_PE_absptr) + /* Use DWARF 2 debugging information by default. */ #define DWARF2_DEBUGGING_INFO #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG Index: b/gcc/config/microblaze/microblaze.md =================================================================== --- a/gcc/config/microblaze/microblaze.md +++ b/gcc/config/microblaze/microblaze.md @@ -2272,4 +2272,15 @@ (set_attr "mode" "SI") (set_attr "length" "4")]) +; This is used in compiling the unwind routines. +(define_expand "eh_return" + [(use (match_operand 0 "general_operand" ""))] + "" + " +{ + microblaze_eh_return(operands[0]); + DONE; +}") + (include "sync.md") +