f8effeba66
Easy to do except for the legacy compile case for i386, in which case we have to start defining fallthrough atomic routines that the compiler will call. At the moment only implement __atomic_fetch_add_4 since its the only one in use.
53 lines
1.2 KiB
ArmAsm
53 lines
1.2 KiB
ArmAsm
/*
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* Copyright (c) 2009 Corey Tabaka
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* Copyright (c) 2020 Travis Geiselbrecht
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*
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* Use of this source code is governed by a MIT-style
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* license that can be found in the LICENSE file or at
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* https://opensource.org/licenses/MIT
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*/
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#include <lk/asm.h>
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.text
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/* void arch_idle(); */
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FUNCTION(arch_idle)
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pushf
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popl %eax
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andl $0x200, %eax
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test %eax, %eax
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je 1f /* don't halt if local interrupts are disabled */
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hlt
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1:
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ret
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#if X86_LEGACY
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/* In legacy mode (compiled for i386) the use of builtin atomics in the compiler
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* ends up emitting calls to various routines that are expected to be provided
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* by an atomic library. Implement them here.
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*
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* Function signatures from https://gcc.gnu.org/wiki/Atomic/GCCMM/LIbrary
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*/
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/*
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* I4 __atomic_fetch_add_4 (I4 *mem, I4 val, int model)
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*/
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FUNCTION(__atomic_fetch_add_4)
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// save old irq disable state and disable irqs
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pushf
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cli
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mov 8(%esp), %edx // mem
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mov 12(%esp), %ecx // val
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mov (%edx),%eax // edx = *mem
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add %eax,%ecx // ecx = edx + val
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mov %ecx,(%edx) // *mem = ecx
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// eax holds the old value
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// restore old irq state
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popf
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ret
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#endif
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