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58 lines
2.1 KiB
ArmAsm
58 lines
2.1 KiB
ArmAsm
#
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# This file defines some trampolines for calling blocks. A block function
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# looks like this:
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#
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# retType blockFn(block*, ...)
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#
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# An IMP looks like this:
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#
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# retType imp(id, SEL,...)
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#
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# The trampoline must find the block pointer and then call the block function
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# with the correct first argument, the self pointer moved to the second real
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# argument (the first block argument) and the _cmd parameter excised
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.file "block_trampolines.S"
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.globl __objc_block_trampoline_sret
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.type __objc_block_trampoline_sret, @function
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.globl __objc_block_trampoline_end_sret
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.globl __objc_block_trampoline
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.type __objc_block_trampoline, @function
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.globl __objc_block_trampoline_end
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#if __x86_64
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__objc_block_trampoline:
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next:
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mov -14(%rip), %esi # Load the block pointer into the second argument
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xchg %edi, %esi # Swap the first and second arguments
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jmp *-30(%rip) # Call the block function
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__objc_block_trampoline_end:
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__objc_block_trampoline_sret:
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__objc_block_trampoline_end_sret:
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#elif __i386
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__objc_block_trampoline:
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call next_line # Store the instruction pointer on the stack
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next_line:
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pop %eax # Load the old instruction pointer
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mov 4(%esp), %ebx # Load the self parameter
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mov %ebx, 8(%esp) # Store self as the second argument
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mov -9(%eax), %ebx # Load the block pointer to %ebx
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mov %ebx, 4(%esp) # Store the block pointer in the first argument
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jmp *-13(%eax) # Call the block function
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__objc_block_trampoline_end:
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__objc_block_trampoline_sret:
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call next_line2 # Store the instruction pointer on the stack
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next_line2:
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pop %eax # Load the old instruction pointer
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mov 8(%esp), %ebx # Load the self parameter
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mov %ebx, 12(%esp) # Store self as the second argument
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mov -9(%eax), %ebx # Load the block pointer to %ebx
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mov %ebx, 8(%esp) # Store the block pointer in the first argument
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jmp *-13(%eax) # Call the block function
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__objc_block_trampoline_end_sret:
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#else
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__objc_block_trampoline:
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__objc_block_trampoline_end:
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__objc_block_trampoline_sret:
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__objc_block_trampoline_end_sret:
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#endif
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