From 7d3692c6933f7ff87bf110dede8e33e922b164c6 Mon Sep 17 00:00:00 2001 From: jcmvbkbc Date: Tue, 15 Sep 2015 19:30:32 +0000 Subject: [PATCH] xtensa: fix xtensa_fallback_frame_state for call0 ABI 2015-09-15 Max Filippov gcc/ * config/xtensa/xtensa.h (DWARF_ALT_FRAME_RETURN_COLUMN): New definition. (DWARF_FRAME_REGISTERS): Reserve space for one extra register in call0 ABI. libgcc/ * config/xtensa/linux-unwind.h (xtensa_fallback_frame_state): Add support for call0 ABI. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227809 138bc75d-0d04-0410-961f-82ee72b054a4 Signed-off-by: Max Filippov --- gcc/config/xtensa/xtensa.h | 4 +++- libgcc/config/xtensa/linux-unwind.h | 30 ++++++++++++++++++++++++++++-- 2 files changed, 31 insertions(+), 3 deletions(-) --- a/gcc/config/xtensa/xtensa.h +++ b/gcc/config/xtensa/xtensa.h @@ -813,7 +813,9 @@ for debugging. */ #define INCOMING_RETURN_ADDR_RTX gen_rtx_REG (Pmode, 0) #define DWARF_FRAME_RETURN_COLUMN DWARF_FRAME_REGNUM (0) -#define DWARF_FRAME_REGISTERS 16 +#define DWARF_ALT_FRAME_RETURN_COLUMN 16 +#define DWARF_FRAME_REGISTERS (DWARF_ALT_FRAME_RETURN_COLUMN \ + + (TARGET_WINDOWED_ABI ? 0 : 1)) #define EH_RETURN_DATA_REGNO(N) ((N) < 2 ? (N) + 2 : INVALID_REGNUM) #define ASM_PREFERRED_EH_DATA_FORMAT(CODE, GLOBAL) \ (flag_pic \ --- a/libgcc/config/xtensa/linux-unwind.h +++ b/libgcc/config/xtensa/linux-unwind.h @@ -52,7 +52,6 @@ #define ENTRY_BYTE 0x36 #endif -#ifdef __XTENSA_WINDOWED_ABI__ #define MD_FALLBACK_FRAME_STATE_FOR xtensa_fallback_frame_state static _Unwind_Reason_Code @@ -61,6 +60,10 @@ { unsigned char *pc = context->ra; struct sigcontext *sc; +#if defined(__XTENSA_CALL0_ABI__) + _Unwind_Ptr new_cfa; + int i; +#endif struct rt_sigframe { siginfo_t info; @@ -76,6 +79,7 @@ || pc[5] != SYSC_BYTE2) return _URC_END_OF_STACK; +#if defined(__XTENSA_WINDOWED_ABI__) rt_ = context->sp; sc = &rt_->uc.uc_mcontext; fs->signal_regs = (_Unwind_Word *) sc->sc_a; @@ -90,11 +94,33 @@ } else fs->signal_ra = sc->sc_pc; +#elif defined(__XTENSA_CALL0_ABI__) + rt_ = context->cfa; + sc = &rt_->uc.uc_mcontext; + + new_cfa = (_Unwind_Ptr) sc; + fs->regs.cfa_how = CFA_REG_OFFSET; + fs->regs.cfa_reg = __LIBGCC_STACK_POINTER_REGNUM__; + fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa; + + for (i = 0; i < 16; i++) + { + fs->regs.reg[i].how = REG_SAVED_OFFSET; + fs->regs.reg[i].loc.offset = (_Unwind_Ptr) &(sc->sc_a[i]) - new_cfa; + } + + fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].how = + REG_SAVED_VAL_OFFSET; + fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].loc.offset = + (_Unwind_Ptr) (sc->sc_pc) - new_cfa; + fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__; +#else +#error Unsupported Xtensa ABI +#endif fs->signal_frame = 1; return _URC_NO_REASON; } -#endif /* __XTENSA_WINDOWED_ABI__ */ #endif /* ifdef inhibit_libc */