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90 lines
2.1 KiB
ArmAsm
90 lines
2.1 KiB
ArmAsm
; Based on the code by Samuel Williams. Created by Sergey Fedorov on 04/06/2022.
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; Credits to Samuel Williams, Rei Odaira and Iain Sandoe. Errors, if any, are mine.
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; Some relevant examples: https://github.com/gcc-mirror/gcc/blob/master/libphobos/libdruntime/config/powerpc/switchcontext.S
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; https://github.com/gcc-mirror/gcc/blob/master/libgcc/config/rs6000/darwin-gpsave.S
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; https://www.ibm.com/docs/en/aix/7.2?topic=epilogs-saving-gprs-only
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; ppc32 version may be re-written compactly with stmw/lwm, but the code wonʼt be faster, see: https://github.com/ruby/ruby/pull/5927#issuecomment-1139730541
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; Notice that this code is only for Darwin (macOS). Darwin ABI differs from AIX and ELF.
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; To add support for AIX, *BSD or *Linux, please make separate implementations.
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#define TOKEN_PASTE(x,y) x##y
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#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
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.machine ppc7400 ; = G4, Rosetta
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.text
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.globl PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
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.align 2
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PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
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; Make space on the stack for caller registers
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; (Should we rather use red zone? See libphobos example.)
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subi r1,r1,80
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; Get LR
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mflr r0
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; Save caller registers
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stw r31,0(r1)
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stw r30,4(r1)
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stw r29,8(r1)
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stw r28,12(r1)
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stw r27,16(r1)
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stw r26,20(r1)
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stw r25,24(r1)
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stw r24,28(r1)
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stw r23,32(r1)
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stw r22,36(r1)
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stw r21,40(r1)
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stw r20,44(r1)
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stw r19,48(r1)
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stw r18,52(r1)
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stw r17,56(r1)
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stw r16,60(r1)
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stw r15,64(r1)
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stw r14,68(r1)
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stw r13,72(r1)
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; Save return address
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; Possibly should rather be saved into linkage area, see libphobos and IBM docs
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stw r0,76(r1)
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; Save stack pointer to first argument
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stw r1,0(r3)
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; Load stack pointer from second argument
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lwz r1,0(r4)
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; Load return address
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lwz r0,76(r1)
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; Restore caller registers
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lwz r13,72(r1)
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lwz r14,68(r1)
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lwz r15,64(r1)
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lwz r16,60(r1)
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lwz r17,56(r1)
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lwz r18,52(r1)
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lwz r19,48(r1)
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lwz r20,44(r1)
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lwz r21,40(r1)
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lwz r22,36(r1)
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lwz r23,32(r1)
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lwz r24,28(r1)
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lwz r25,24(r1)
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lwz r26,20(r1)
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lwz r27,16(r1)
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lwz r28,12(r1)
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lwz r29,8(r1)
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lwz r30,4(r1)
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lwz r31,0(r1)
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; Set LR
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mtlr r0
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; Pop stack frame
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addi r1,r1,80
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; Jump to return address
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