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Reorganise block_trampolines.S to have a lot less copy-and-pasting.

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David Chisnall 10 years ago
parent 3dcb70bf59
commit cbdc6c8786
1 changed files with 98 additions and 92 deletions
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168
block_trampolines.S
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@ -15,108 +15,97 @@
# argument (the first block argument) and the _cmd parameter excised
.file "block_trampolines.S"
#ifdef __ARM_ARCH
#ifdef __arm__
.syntax unified
#endif
.globl CDECL(__objc_block_trampoline_sret)
TYPE_DIRECTIVE(CDECL(__objc_block_trampoline_sret), %function)
.globl CDECL(__objc_block_trampoline_end_sret)
.globl CDECL(__objc_block_trampoline)
TYPE_DIRECTIVE(CDECL(__objc_block_trampoline), %function)
.globl CDECL(__objc_block_trampoline_end)
#else
.globl CDECL(__objc_block_trampoline_sret)
TYPE_DIRECTIVE(CDECL(__objc_block_trampoline_sret), @function)
.globl CDECL(__objc_block_trampoline_end_sret)
.globl CDECL(__objc_block_trampoline)
TYPE_DIRECTIVE(CDECL(__objc_block_trampoline), @function)
.globl CDECL(__objc_block_trampoline_end)
#endif
#if __x86_64
////////////////////////////////////////////////////////////////////////////////
// x86-64 trampoline
////////////////////////////////////////////////////////////////////////////////
.macro trampoline arg0, arg1
mov -0x1007(%rip), \arg1 # Load the block pointer into the second argument
xchg \arg1, \arg0 # Swap the first and second arguments
jmp *-0x1008(%rip) # Call the block function
.endm
// The Win64 and SysV x86-64 ABIs use different registers
# ifdef _WIN64
# define ARG0 %rcx
# define ARG1 %rdx
#define ARG2 %r8
# define SARG1 %r8
# else
# define ARG0 %rdi
# define ARG1 %rsi
#define ARG2 %rdx
# define SARG1 %rdx
# endif
CDECL(__objc_block_trampoline):
mov -0x1007(%rip), ARG1 # Load the block pointer into the second argument
xchg ARG1, ARG0 # Swap the first and second arguments
jmp *-0x1008(%rip) # Call the block function
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
mov -0x1007(%rip), ARG2 # Load the block pointer into the second argument
xchg ARG1, ARG2 # Swap the first and second arguments
jmp *-0x1008(%rip) # Call the block function
CDECL(__objc_block_trampoline_end_sret):
# define SARG0 ARG1
#elif __i386
CDECL(__objc_block_trampoline):
call Lnext_line # Store the instruction pointer on the stack
Lnext_line:
pop %eax # Load the old instruction pointer
mov 4(%esp), %ebx # Load the self parameter
mov %ebx, 8(%esp) # Store self as the second argument
mov -0x1005(%eax), %ebx # Load the block pointer to %ebx
mov %ebx, 4(%esp) # Store the block pointer in the first argument
jmp *-0x1001(%eax) # Call the block function
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
call Lnext_line2 # Store the instruction pointer on the stack
Lnext_line2:
////////////////////////////////////////////////////////////////////////////////
// x86-32 trampoline
////////////////////////////////////////////////////////////////////////////////
.macro trampoline arg0, arg1
call 1f # Store the instruction pointer on the stack
1:
pop %eax # Load the old instruction pointer
mov 8(%esp), %ebx # Load the self parameter
mov %ebx, 12(%esp) # Store self as the second argument
mov \arg0(%esp), %ebx # Load the self parameter
mov %ebx, \arg1(%esp) # Store self as the second argument
mov -0x1005(%eax), %ebx # Load the block pointer to %ebx
mov %ebx, 8(%esp) # Store the block pointer in the first argument
mov %ebx, \arg0(%esp) # Store the block pointer in the first argument
jmp *-0x1001(%eax) # Call the block function
CDECL(__objc_block_trampoline_end_sret):
.endm
// All arguments on i386 are passed on the stack. These values are stack
// offsets - on other platforms they're register values.
# define ARG0 4
# define ARG1 8
# define SARG0 8
# define SARG1 12
#elif __mips__
////////////////////////////////////////////////////////////////////////////////
// MIPS trampoline
////////////////////////////////////////////////////////////////////////////////
# ifdef _ABI64
CDECL(__objc_block_trampoline):
move $a1, $a0
ld $a0, -4096($25)
ld $25, -4088($25)
jr $25
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
move $a2, $a1
ld $a1, -4096($25)
.macro trampoline arg0, arg1
move \arg1, \arg0
ld \arg0, -4096($25)
ld $25, -4088($25)
jr $25
CDECL(__objc_block_trampoline_end_sret):
.endm
# else
CDECL(__objc_block_trampoline):
move $a1, $a0
lw $a0, -4096($25)
lw $25, -4092($25)
jr $25
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
move $a2, $a1
lw $a1, -4096($25)
// 32-bit variant. This ought to work with both n32 and o32, because they both
// use 32-bit pointers and both use the same registers for the first four
// arguments (and we only care about the first three).
.macro trampoline arg0, arg1
move \arg1, \arg0
lw \arg0, -4096($25)
lw $25, -4092($25)
jr $25
CDECL(__objc_block_trampoline_end_sret):
.endm
# endif
#define ARG0 $a0
#define ARG1 $a1
#define ARG2 $a2
#elif defined(__ARM_ARCH_ISA_A64)
////////////////////////////////////////////////////////////////////////////////
// AArch64 (ARM64) trampoline
////////////////////////////////////////////////////////////////////////////////
.macro trampoline arg0, arg1
adr x17, #-4096
mov \arg1, \arg0
ldp \arg0, x17, [x17]
br x17
.endm
CDECL(__objc_block_trampoline):
trampoline x0, x1
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
trampoline x1, x2
CDECL(__objc_block_trampoline_end_sret):
#define ARG0 x0
#define ARG1 x1
#define SARG0 x0
#define SARG1 x1
#elif __arm__
#if 0 && ((__ARM_ARCH >= 7) || defined (__ARM_ARCH_6T2__))
////////////////////////////////////////////////////////////////////////////////
// AArch32 (ARM) trampoline
////////////////////////////////////////////////////////////////////////////////
# if ((__ARM_ARCH >= 7) || defined (__ARM_ARCH_6T2__))
// If we're on a target that supports Thumb 2, then we need slightly more
// instructions to support Thumb/ARM code for the IMP and so we need to make
// the trampolines thumb to be able to fit them in 16 bytes (they fit exactly
@ -137,19 +126,36 @@ CDECL(__objc_block_trampoline_end_sret):
ldr pc, [r12, #-4] // Jump to the block function
.endm
# endif // ((__ARM_ARCH >= 7) || defined (__ARM_ARCH_6T2__))
CDECL(__objc_block_trampoline):
trampoline r0, r1
CDECL(__objc_block_trampoline_end):
CDECL(__objc_block_trampoline_sret):
trampoline r1, r2
CDECL(__objc_block_trampoline_end_sret):
#define ARG0 r0
#define ARG1 r1
#define SARG0 r1
#define SARG1 r2
#else
#warning imp_implementationWithBlock() not implemented for your architecture
.macro trampoline arg0, arg1
.endm
#define ARG0 0
#define ARG1 0
#define SARG0 0
#define SARG1 0
#endif
.globl CDECL(__objc_block_trampoline)
CDECL(__objc_block_trampoline):
trampoline ARG0, ARG1
.globl CDECL(__objc_block_trampoline_end)
CDECL(__objc_block_trampoline_end):
.globl CDECL(__objc_block_trampoline_sret)
CDECL(__objc_block_trampoline_sret):
trampoline SARG0, SARG1
.globl CDECL(__objc_block_trampoline_end_sret)
CDECL(__objc_block_trampoline_end_sret):
#endif
#ifdef __ELF__
.section .note.GNU-stack,"",%progbits
#endif

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