590e26360c
call0 is an ABI that doesn't use register windows.
2015-03-03 Max Filippov <jcmvbkbc@gmail.com>
gcc/
* config/xtensa/constraints.md ("a" constraint): Include stack
pointer in case of call0 ABI.
("q" constraint): Make empty in case of call0 ABI.
("D" constraint): Include stack pointer in case of call0 ABI.
* config/xtensa/xtensa-protos.h (xtensa_set_return_address,
xtensa_expand_epilogue, xtensa_regno_to_class): Add new function
prototypes.
* config/xtensa/xtensa.c (xtensa_callee_save_size): New
variable.
(xtensa_regno_to_class): Make it a local variable in the
function xtensa_regno_to_class.
(xtensa_function_epilogue, TARGET_ASM_FUNCTION_EPILOGUE): Remove
macro, function prototype and implementation.
(reg_nonleaf_alloc_order): Make it a local variable in the
function order_regs_for_local_alloc.
(xtensa_conditional_register_usage): New function.
(TARGET_CONDITIONAL_REGISTER_USAGE): Define macro.
(xtensa_valid_move): Allow direct moves to stack pointer
register in call0 ABI.
(xtensa_setup_frame_addresses): Only spill register windows in
windowed ABI.
(xtensa_emit_call): Emit call(x)8 or call(x)0 in windowed and
call0 ABI respectively.
(xtensa_function_arg_1): Only mark a7 register for copying in
windowed ABI.
(xtensa_call_save_reg): New function.
(compute_frame_size): Add space for callee saved register
storage to the frame size in call0 ABI.
(xtensa_expand_prologue): Generate code to set up stack frame
and save callee-saved registers in call0 ABI.
(xtensa_expand_epilogue): New function.
(xtensa_set_return_address): New function.
(xtensa_return_addr): Calculate return address in call0 ABI.
(xtensa_builtin_saveregs): Only mark a7 register for copying and
emit copying code in windowed ABI.
(order_regs_for_local_alloc): Add preferred register allocation
order for non-leaf function in call0 ABI.
(xtensa_static_chain): Add atatic chain passing for call0 ABI.
(xtensa_asm_trampoline_template): Add trampoline generation for
call0 ABI.
(xtensa_trampoline_init): Add trampoline initialization for
call0 ABI.
(xtensa_conditional_register_usage, xtensa_regno_to_class): New
functions.
* config/xtensa/xtensa.h (TARGET_WINDOWED_ABI): New macro.
(TARGET_CPU_CPP_BUILTINS): Add built-in define for call0 ABI.
(CALL_USED_REGISTERS): Modify to encode both windowed and call0
ABI call-used registers.
(HARD_FRAME_POINTER_REGNUM): Add frame pointer for call0 ABI.
(INCOMING_REGNO, OUTGOING_REGNO): Use argument unchanged in
call0 ABI.
(REG_CLASS_CONTENTS): Include all registers into the preferred
reload registers set, adjust the set in the
xtensa_conditional_register_usage.
(xtensa_regno_to_class): Drop variable declaration.
(REGNO_REG_CLASS): Redefine to use xtensa_regno_to_class
function.
(WINDOW_SIZE): Define as 8 or 0 for windowed and call0 ABI
respectively.
(FUNCTION_PROFILER): Add _mcount call for call0 ABI.
(TRAMPOLINE_SIZE): Define trampoline size for call0 ABI.
(RETURN_ADDR_IN_PREVIOUS_FRAME): Define to 0 in call0 ABI.
(ASM_OUTPUT_POOL_PROLOGUE): Always generate literal pool
location in call0 ABI.
(EH_RETURN_STACKADJ_RTX): New definition, use a10 for passing
stack adjustment size when handling exception.
(CRT_CALL_STATIC_FUNCTION): Add definition for call0 ABI.
* config/xtensa/xtensa.md (A9_REG, UNSPECV_BLOCKAGE): New
definitions.
("return" pattern): Generate ret.n/ret in call0 ABI.
("epilogue" pattern): Expand epilogue.
("nonlocal_goto" pattern): Use default in call0 ABI.
("eh_return" pattern): Move implementation to eh_set_a0_windowed,
emit eh_set_a0_* depending on ABI.
("eh_set_a0_windowed" pattern): Former eh_return pattern.
("eh_set_a0_call0", "blockage"): New patterns.
libgcc/
* config/xtensa/lib2funcs.S (__xtensa_libgcc_window_spill,
__xtensa_nonlocal_goto): Don't compile for call0 ABI.
(__xtensa_sync_caches): Only use entry and retw in windowed ABI,
use ret in call0 ABI.
* config/xtensa/t-windowed: New file.
* libgcc/config/xtensa/t-xtensa (LIB2ADDEH): Move to t-windowed.
* libgcc/configure: Regenerated.
* libgcc/configure.ac: Check if xtensa target is configured for
windowed ABI and thus needs to use custom unwind code.
From-SVN: r221158
101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* DWARF2 EH unwinding support for Xtensa.
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Copyright (C) 2008-2015 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GCC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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/* Do code reading to identify a signal frame, and set the frame
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state data appropriately. See unwind-dw2-xtensa.c for the structs.
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Don't use this at all if inhibit_libc is used. */
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#ifndef inhibit_libc
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#include <signal.h>
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#include <sys/ucontext.h>
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/* Encoded bytes for Xtensa instructions:
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movi a2, __NR_rt_sigreturn
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syscall
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entry (first byte only)
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Some of the bytes are endian-dependent. */
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#define MOVI_BYTE0 0x22
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#define MOVI_BYTE2 225 /* __NR_rt_sigreturn */
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#define SYSC_BYTE0 0
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#define SYSC_BYTE2 0
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#ifdef __XTENSA_EB__
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#define MOVI_BYTE1 0x0a
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#define SYSC_BYTE1 0x05
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#define ENTRY_BYTE 0x6c
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#else
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#define MOVI_BYTE1 0xa0
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#define SYSC_BYTE1 0x50
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#define ENTRY_BYTE 0x36
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#endif
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#ifdef __XTENSA_WINDOWED_ABI__
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#define MD_FALLBACK_FRAME_STATE_FOR xtensa_fallback_frame_state
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static _Unwind_Reason_Code
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xtensa_fallback_frame_state (struct _Unwind_Context *context,
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_Unwind_FrameState *fs)
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{
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unsigned char *pc = context->ra;
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struct sigcontext *sc;
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struct rt_sigframe {
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siginfo_t info;
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struct ucontext uc;
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} *rt_;
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/* movi a2, __NR_rt_sigreturn; syscall */
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if (pc[0] != MOVI_BYTE0
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|| pc[1] != MOVI_BYTE1
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|| pc[2] != MOVI_BYTE2
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|| pc[3] != SYSC_BYTE0
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|| pc[4] != SYSC_BYTE1
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|| pc[5] != SYSC_BYTE2)
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return _URC_END_OF_STACK;
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rt_ = context->sp;
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sc = &rt_->uc.uc_mcontext;
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fs->signal_regs = (_Unwind_Word *) sc->sc_a;
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/* If the signal arrived just before an ENTRY instruction, find the return
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address and pretend the signal arrived before executing the CALL. */
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if (*(unsigned char *) sc->sc_pc == ENTRY_BYTE)
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{
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unsigned callinc = (sc->sc_ps >> 16) & 3;
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fs->signal_ra = ((sc->sc_a[callinc << 2] & XTENSA_RA_FIELD_MASK)
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| context->ra_high_bits) - 3;
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}
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else
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fs->signal_ra = sc->sc_pc;
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fs->signal_frame = 1;
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return _URC_NO_REASON;
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}
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#endif /* __XTENSA_WINDOWED_ABI__ */
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#endif /* ifdef inhibit_libc */
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