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.
68 lines
1.8 KiB
ArmAsm
68 lines
1.8 KiB
ArmAsm
//===-- aeabi_uidivmod.S - EABI uidivmod 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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// struct { unsigned quot, unsigned rem}
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// __aeabi_uidivmod(unsigned numerator, unsigned denominator) {
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// unsigned rem, quot;
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// quot = __udivmodsi4(numerator, denominator, &rem);
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// return {quot, rem};
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// }
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#if defined(__MINGW32__)
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#define __aeabi_uidivmod __rt_udiv
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#endif
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.syntax unified
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.text
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DEFINE_CODE_STATE
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.p2align 2
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DEFINE_COMPILERRT_FUNCTION(__aeabi_uidivmod)
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#if defined(USE_THUMB_1)
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cmp r0, r1
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bcc LOCAL_LABEL(case_denom_larger)
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push {r0, r1, lr}
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bl SYMBOL_NAME(__aeabi_uidiv)
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pop {r1, r2, r3}
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muls r2, r0, r2 // r2 = quot * denom
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subs r1, r1, r2
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JMP (r3)
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LOCAL_LABEL(case_denom_larger):
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movs r1, r0
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movs r0, #0
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JMP (lr)
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#else // defined(USE_THUMB_1)
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PACBTI_LANDING
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#if defined(__ARM_FEATURE_PAC_DEFAULT)
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push { r12, lr }
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#else
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push { lr }
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#endif
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sub sp, sp, #4
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mov r2, sp
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#if defined(__MINGW32__)
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mov r3, r0
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mov r0, r1
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mov r1, r3
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#endif
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bl SYMBOL_NAME(__udivmodsi4)
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ldr r1, [sp]
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add sp, sp, #4
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#if defined(__ARM_FEATURE_PAC_DEFAULT)
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pop { r12, lr }
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bxaut r12, lr, sp
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#else
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pop { pc }
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#endif
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#endif
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END_COMPILERRT_FUNCTION(__aeabi_uidivmod)
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NO_EXEC_STACK_DIRECTIVE
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