linux64_closure.s

gcc的组建

#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>

	.file	"linux64_closure.S"

#ifdef __powerpc64__
	FFI_HIDDEN (ffi_closure_LINUX64)
	FFI_HIDDEN (.ffi_closure_LINUX64)
	.globl  ffi_closure_LINUX64, .ffi_closure_LINUX64
	.section        ".opd","aw"
	.align  3
ffi_closure_LINUX64:
	.quad   .ffi_closure_LINUX64,.TOC.@tocbase,0
	.size   ffi_closure_LINUX64,24
	.type   .ffi_closure_LINUX64,@function
	.text
.ffi_closure_LINUX64:
.LFB1:
	# save general regs into parm save area
	std	%r3, 48(%r1)
	std	%r4, 56(%r1)
	std	%r5, 64(%r1)
	std	%r6, 72(%r1)
	mflr	%r0

	std	%r7, 80(%r1)
	std	%r8, 88(%r1)
	std	%r9, 96(%r1)
	std	%r10, 104(%r1)
	std	%r0, 16(%r1)

	# mandatory 48 bytes special reg save area + 64 bytes parm save area
	# + 16 bytes retval area + 13*8 bytes fpr save area + round to 16
	stdu	%r1, -240(%r1)
.LCFI0:

	# next save fpr 1 to fpr 13
	stfd  %f1, 128+(0*8)(%r1)
	stfd  %f2, 128+(1*8)(%r1)
	stfd  %f3, 128+(2*8)(%r1)
	stfd  %f4, 128+(3*8)(%r1)
	stfd  %f5, 128+(4*8)(%r1)
	stfd  %f6, 128+(5*8)(%r1)
	stfd  %f7, 128+(6*8)(%r1)
	stfd  %f8, 128+(7*8)(%r1)
	stfd  %f9, 128+(8*8)(%r1)
	stfd  %f10, 128+(9*8)(%r1)
	stfd  %f11, 128+(10*8)(%r1)
	stfd  %f12, 128+(11*8)(%r1)
	stfd  %f13, 128+(12*8)(%r1)

	# set up registers for the routine that actually does the work
	# get the context pointer from the trampoline
	mr %r3, %r11

	# now load up the pointer to the result storage
	addi %r4, %r1, 112

	# now load up the pointer to the parameter save area
	# in the previous frame
	addi %r5, %r1, 240 + 48

	# now load up the pointer to the saved fpr registers */
	addi %r6, %r1, 128

	# make the call
	bl .ffi_closure_helper_LINUX64
.Lret:

	# now r3 contains the return type
	# so use it to look up in a table
	# so we know how to deal with each type

	# look up the proper starting point in table
	# by using return type as offset
	mflr %r4		# move address of .Lret to r4
	sldi %r3, %r3, 4	# now multiply return type by 16
	addi %r4, %r4, .Lret_type0 - .Lret
	ld %r0, 240+16(%r1)
	add %r3, %r3, %r4	# add contents of table to table address
	mtctr %r3
	bctr			# jump to it

# Each of the ret_typeX code fragments has to be exactly 16 bytes long
# (4 instructions). For cache effectiveness we align to a 16 byte boundary
# first.
	.align 4

.Lret_type0:
# case FFI_TYPE_VOID
	mtlr %r0
	addi %r1, %r1, 240
	blr
	nop
# case FFI_TYPE_INT
	lwa %r3, 112+4(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_FLOAT
	lfs %f1, 112+0(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_DOUBLE
	lfd %f1, 112+0(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_LONGDOUBLE
	lfd %f1, 112+0(%r1)
	mtlr %r0
	lfd %f2, 112+8(%r1)
	b .Lfinish
# case FFI_TYPE_UINT8
	lbz %r3, 112+7(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_SINT8
	lbz %r3, 112+7(%r1)
	extsb %r3,%r3
	mtlr %r0
	b .Lfinish
# case FFI_TYPE_UINT16
	lhz %r3, 112+6(%r1)
	mtlr %r0
.Lfinish:
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_SINT16
	lha %r3, 112+6(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_UINT32
	lwz %r3, 112+4(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_SINT32
	lwa %r3, 112+4(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_UINT64
	ld %r3, 112+0(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_SINT64
	ld %r3, 112+0(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# case FFI_TYPE_STRUCT
	mtlr %r0
	addi %r1, %r1, 240
	blr
	nop
# case FFI_TYPE_POINTER
	ld %r3, 112+0(%r1)
	mtlr %r0
	addi %r1, %r1, 240
	blr
# esac
.LFE1:
	.long	0
	.byte	0,12,0,1,128,0,0,0
	.size	.ffi_closure_LINUX64,.-.ffi_closure_LINUX64

	.section	.eh_frame,EH_FRAME_FLAGS,@progbits
.Lframe1:
	.4byte	.LECIE1-.LSCIE1	 # Length of Common Information Entry
.LSCIE1:
	.4byte	0x0	 # CIE Identifier Tag
	.byte	0x1	 # CIE Version
	.ascii "zR\0"	 # CIE Augmentation
	.uleb128 0x1	 # CIE Code Alignment Factor
	.sleb128 -8	 # CIE Data Alignment Factor
	.byte	0x41	 # CIE RA Column
	.uleb128 0x1	 # Augmentation size
	.byte	0x14	 # FDE Encoding (pcrel udata8)
	.byte	0xc	 # DW_CFA_def_cfa
	.uleb128 0x1
	.uleb128 0x0
	.align 3
.LECIE1:
.LSFDE1:
	.4byte	.LEFDE1-.LASFDE1	 # FDE Length
.LASFDE1:
	.4byte	.LASFDE1-.Lframe1	 # FDE CIE offset
	.8byte	.LFB1-.	 # FDE initial location
	.8byte	.LFE1-.LFB1	 # FDE address range
	.uleb128 0x0	 # Augmentation size
	.byte	0x2	 # DW_CFA_advance_loc1
	.byte	.LCFI0-.LFB1
	.byte	0xe	 # DW_CFA_def_cfa_offset
	.uleb128 240
	.byte	0x11	 # DW_CFA_offset_extended_sf
	.uleb128 0x41
	.sleb128 -2
	.align 3
.LEFDE1:
#endif