a59a8ae1a9
Some of the aeabi functions were missing PACBTI support. The lack of it resulted in exceptions at runtime if the running environment had PAC and/or BTI enabled. This patch adds this support. This involves the addition of PACBTI instructions, depending on whether each of these features is enabled, plus the saving and restoring of the PAC code that resides in r12. Some of the common code has been put in preprocessor macros to reduce duplication, but not all, especially since some register saving and restoring is very specific to each context.
66 lines
2.3 KiB
ArmAsm
66 lines
2.3 KiB
ArmAsm
//===-- aeabi_fcmp.S - EABI fcmp* implementation ---------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "../assembly.h"
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// int __aeabi_fcmp{eq,lt,le,ge,gt}(float a, float b) {
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// int result = __{eq,lt,le,ge,gt}sf2(a, b);
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// if (result {==,<,<=,>=,>} 0) {
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// return 1;
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// } else {
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// return 0;
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// }
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// }
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#if defined(COMPILER_RT_ARMHF_TARGET)
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# define CONVERT_FCMP_ARGS_TO_SF2_ARGS \
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vmov s0, r0 SEPARATOR \
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vmov s1, r1
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#else
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# define CONVERT_FCMP_ARGS_TO_SF2_ARGS
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#endif
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#if defined(__ARM_FEATURE_PAC_DEFAULT)
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# define PROLOGUE PACBTI_LANDING SEPARATOR \
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push { r12, lr }
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# define EPILOGUE pop { r12, lr } SEPARATOR \
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bxaut r12, lr, sp
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#elif defined(__ARM_FEATURE_BTI_DEFAULT)
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# define PROLOGUE PACBTI_LANDING SEPARATOR \
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push { r4, lr }
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# define EPILOGUE pop { r4, pc }
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#else
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# define PROLOGUE push { r4, lr }
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# define EPILOGUE pop { r4, pc }
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#endif
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#define DEFINE_AEABI_FCMP(cond) \
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.syntax unified SEPARATOR \
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.p2align 2 SEPARATOR \
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DEFINE_COMPILERRT_FUNCTION(__aeabi_fcmp ## cond) \
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PROLOGUE SEPARATOR \
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CONVERT_FCMP_ARGS_TO_SF2_ARGS SEPARATOR \
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bl SYMBOL_NAME(__ ## cond ## sf2) SEPARATOR \
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cmp r0, #0 SEPARATOR \
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b ## cond 1f SEPARATOR \
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movs r0, #0 SEPARATOR \
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EPILOGUE SEPARATOR \
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1: SEPARATOR \
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movs r0, #1 SEPARATOR \
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EPILOGUE SEPARATOR \
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END_COMPILERRT_FUNCTION(__aeabi_fcmp ## cond)
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DEFINE_AEABI_FCMP(eq)
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DEFINE_AEABI_FCMP(lt)
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DEFINE_AEABI_FCMP(le)
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DEFINE_AEABI_FCMP(ge)
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DEFINE_AEABI_FCMP(gt)
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NO_EXEC_STACK_DIRECTIVE
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