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Atomics: GCC fix for M23 (ARMv8-M baseline) 

Add unified syntax directives to make the atomic assembler work when GCC
is building for M23.

GCC actually uses unified syntax when compiling C code, but puts
`.syntax divided` before each piece of inline assembly when targetting
Thumb-1 type devices like M0 and M23 for backwards compatibility. We can
overcome this with our own `.syntax unified`.  The command-line option
`-masm-syntax-unified` intended to override this globally has been
broken from GCC 6 to 8.0.
pull/10705/head
Kevin Bracey 2019-05-29 16:48:41 +03:00
parent 9cc1caa031
commit 03f1ac3ffd
1 changed files with 6 additions and 1 deletions
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7
platform/internal/mbed_atomic_impl.h
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@ -1,4 +1,3 @@
/*
* Copyright (c) 2015-2016, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
@ -109,6 +108,7 @@ extern "C" {
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_EXCHG_ASM(M) \
__asm volatile ( \
".syntax unified\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
"STREX"#M "\t%[fail], %[newValue], %[value]\n\t" \
: [oldValue] "=&r" (oldValue), \
@ -141,6 +141,7 @@ extern "C" {
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_3OP_ASM(OP, Constants, M) \
__asm volatile ( \
".syntax unified\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
#OP "\t%[newValue], %[oldValue], %[arg]\n\t" \
"STREX"#M "\t%[fail], %[newValue], %[value]\n\t" \
@ -181,6 +182,7 @@ extern "C" {
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_2OP_ASM(OP, Constants, M) \
__asm volatile ( \
".syntax unified\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
"MOV" "\t%[newValue], %[oldValue]\n\t" \
#OP "\t%[newValue], %[arg]\n\t" \
@ -224,6 +226,7 @@ extern "C" {
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_CAS_WEAK_ASM(M) \
__asm volatile ( \
".syntax unified\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
"SUBS" "\t%[fail], %[oldValue], %[expectedValue]\n\t"\
"STREX"#M"EQ\t%[fail], %[desiredValue], %[value]\n\t" \
@ -261,6 +264,7 @@ done: \
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_CAS_WEAK_ASM(M) \
__asm volatile ( \
".syntax unified\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
"SUBS" "\t%[fail], %[oldValue], %[expectedValue]\n\t"\
"BNE" "\t%=f\n\t" \
@ -311,6 +315,7 @@ done: \
#elif defined __clang__ || defined __GNUC__
#define DO_MBED_LOCKFREE_CAS_STRONG_ASM(M) \
__asm volatile ( \
".syntax unified\n\t" \
"\n%=:\n\t" \
"LDREX"#M "\t%[oldValue], %[value]\n\t" \
"SUBS" "\t%[fail], %[oldValue], %[expectedValue]\n\t"\