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.type .make_fcontext,@function |
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.type .make_fcontext,@function |
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.globl .make_fcontext |
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.globl .make_fcontext |
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.make_fcontext: |
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.make_fcontext: |
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mflr %r0 # save return address into R0 |
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mflr %r6 # save return address into R6 |
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std %r0, 8(%r1) # save return address on stack, set up stack frame |
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stdu %r1, -96(%r1) # allocate stack space, SP % 16 == 0 |
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std %r5, 64(%r1) # save 3. arg of make_fcontext, pointer to context function |
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std %r4, 56(%r1) # save 2. arg of make_fcontext, context stack size |
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std %r3, 48(%r1) # save 1. arg of make_fcontext, pointer to context stack (base) |
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mr %r0, %r3 |
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subi %r3, %r3, 352 # reserve space for fcontext_t at top of context stack |
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subi %r3, %r3, 352 # reserve space for fcontext_t at top of context stack |
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bl align_stack@plt # call align_stack, R3 contains address at 16 byte boundary after return |
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# == pointer to fcontext_t and address of context stack |
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ld %r4, 48(%r1) # restore pointer to context stack (base) |
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ld %r5, 56(%r1) # restore context stack size |
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ld %r6, 64(%r1) # restore pointer to context function |
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std %r4, 184(%r3) # save address of context stack (base) in fcontext_t |
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# call align_stack, R3 contains address at 16 byte boundary after return |
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# == pointer to fcontext_t and address of context stack |
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clrrdi %r3, %r3, 4 |
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std %r0, 184(%r3) # save address of context stack (base) in fcontext_t |
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std %r5, 192(%r3) # save context stack size in fcontext_t |
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std %r5, 192(%r3) # save context stack size in fcontext_t |
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std %r6, 176(%r3) # save address of context function in fcontext_t |
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std %r6, 176(%r3) # save address of context function in fcontext_t |
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subf %r0, %r3, 64 # 64 bytes on stack for parameter area (== 8 registers) |
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subi %r0, %r3, 64 # 64 bytes on stack for parameter area (== 8 registers) |
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std %r0, 152(%r3) # save the stack base |
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std %r0, 152(%r3) # save the stack base |
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mflr %r0 # load LR |
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mflr %r0 # load LR |
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std %r4, 168(%r3) # save address of finish as return address for context function |
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std %r4, 168(%r3) # save address of finish as return address for context function |
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# entered after context function returns |
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# entered after context function returns |
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addi %r1, %r1, 64 # deallocate stack space |
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mtlr %r6 # restore return address |
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lwz %r0, 8(%r1) # load return address from stack, destroy stack frame |
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mtlr %r0 # restore return address |
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blr |
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blr |
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Lines 136-140
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stwu %r1, -32(%r1) # allocate stack space, SP % 16 == 0 |
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stwu %r1, -32(%r1) # allocate stack space, SP % 16 == 0 |
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li %r3, 0 # set return value to zero |
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li %r3, 0 # set return value to zero |
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bl _exit@plt # exit application |
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bl _exit # exit application |
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nop |
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.size .make_fcontext, .-.make_fcontext |
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.size .make_fcontext, .-.make_fcontext |
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.section .note.GNU-stack,"",%progbits |