----------------------------------------------------------------------- sysv.S - Copyright (c) 1998, 2008, 2011 Red Hat, Inc. Copyright (c) 2011 Plausible Labs Cooperative, Inc. ARM Foreign Function Interface Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ``Software''), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. -----------------------------------------------------------------------
define LIBFFI_ASM
include <fficonfig.h> include <ffi.h> ifdef HAVE_MACHINE_ASM_H include <machine/asm.h> else ifdef USER_LABEL_PREFIX define CONCAT1(a, b) CONCAT2(a, b) define CONCAT2(a, b) a ## b
Use the right prefix for global labels.
define CNAME(x) CONCAT1 (USER_LABEL_PREFIX, x) else define CNAME(x) x endif ifdef __APPLE__ define ENTRY(x) .globl CNAME(x); CNAME(x): else define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x): endif /* __APPLE__ */ endif
ifdef __ELF__ define LSYM(x) .x else define LSYM(x) x endif
/* Use the SOFTFP return value ABI on Mac OS X, as per the iOS ABI
Function Call Guide */
ifdef __APPLE__ define __SOFTFP__ endif
/* We need a better way of testing for this, but for now, this is all
we can do. */
@ This selects the minimum architecture level required. define ARM_ARCH 3
if defined(ARM_ARCH_4) || defined(ARM_ARCH_4T) # undef ARM_ARCH # define ARM_ARCH 4 endif
if defined(ARM_ARCH_5) || defined(ARM_ARCH_5T) \
|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \ || defined(__ARM_ARCH_5TEJ__)
# undef ARM_ARCH # define ARM_ARCH 5 endif
if defined(ARM_ARCH_6) || defined(ARM_ARCH_6J) \
|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \ || defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \ || defined(__ARM_ARCH_6M__)
# undef ARM_ARCH # define ARM_ARCH 6 endif
if defined(ARM_ARCH_7) || defined(ARM_ARCH_7A) \
|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \ || defined(__ARM_ARCH_7EM__)
# undef ARM_ARCH # define ARM_ARCH 7 endif
if ARM_ARCH >= 5 # define call_reg(x) blx x elif defined (ARM_ARCH_4T) # define call_reg(x) mov lr, pc ; bx x # if defined(__thumb__) || defined(THUMB_INTERWORK) # define __INTERWORKING__ # endif else # define call_reg(x) mov lr, pc ; mov pc, x endif
/* Conditionally compile unwinder directives. */ ifdef ARM_EABI define UNWIND else define UNWIND @ endif
if defined(__thumb__) && !defined(THUMB_INTERWORK) .macro ARM_FUNC_START name
.text .align 0 .thumb .thumb_func
ifdef __APPLE__
ENTRY($0)
else
ENTRY(\name)
endif
bx pc nop .arm UNWIND .fnstart
/* A hook to tell gdb that we've switched to ARM mode. Also used to call
directly from other local arm routines. */
ifdef __APPLE__ L_$0: else L_name: endif .endm else .macro ARM_FUNC_START name
.text .align 0 .arm
ifdef __APPLE__
ENTRY($0)
else
ENTRY(\name)
endif
UNWIND .fnstart
.endm endif
.macro RETLDM regs=, cond=, dirn=ia if defined (__INTERWORKING__)
.ifc "\regs","" ldr\cond lr, [sp], #4 .else ldm\cond\dirn sp!, {\regs, lr} .endif bx\cond lr
else
.ifc "\regs","" ldr\cond pc, [sp], #4 .else ldm\cond\dirn sp!, {\regs, pc} .endif
endif .endm
@ r0: ffi_prep_args @ r1: &ecif @ r2: cif->bytes @ r3: fig->flags @ sp+0: ecif.rvalue @ This assumes we are using gas.
ARM_FUNC_START ffi_call_SYSV
@ Save registers stmfd sp!, {r0-r3, fp, lr} UNWIND .save {r0-r3, fp, lr} mov fp, sp UNWIND .setfp fp, sp @ Make room for all of the new args. sub sp, fp, r2 @ Place all of the ffi_prep_args in position mov r0, sp @ r1 already set @ Call ffi_prep_args(stack, &ecif) bl ffi_prep_args @ move first 4 parameters in registers ldmia sp, {r0-r3} @ and adjust stack sub lr, fp, sp @ cif->bytes == fp - sp ldr ip, [fp] @ load fn() in advance cmp lr, #16 movhs lr, #16 add sp, sp, lr @ call (fn) (...) call_reg(ip) @ Remove the space we pushed for the args mov sp, fp @ Load r2 with the pointer to storage for the return value ldr r2, [sp, #24] @ Load r3 with the return type code ldr r3, [sp, #12] @ If the return value pointer is NULL, assume no return value. cmp r2, #0 beq LSYM(Lepilogue)
@ return INT
cmp r3, #FFI_TYPE_INT
if defined(__SOFTFP__) || defined(ARM_EABI)
cmpne r3, #FFI_TYPE_FLOAT
endif
streq r0, [r2] beq LSYM(Lepilogue) @ return INT64 cmp r3, #FFI_TYPE_SINT64
if defined(__SOFTFP__) || defined(ARM_EABI)
cmpne r3, #FFI_TYPE_DOUBLE
endif
stmeqia r2, {r0, r1}
if !defined(__SOFTFP__) && !defined(ARM_EABI)
beq LSYM(Lepilogue)
@ return FLOAT
cmp r3, #FFI_TYPE_FLOAT stfeqs f0, [r2] beq LSYM(Lepilogue)
@ return DOUBLE or LONGDOUBLE
cmp r3, #FFI_TYPE_DOUBLE stfeqd f0, [r2]
endif
LSYM(Lepilogue): if defined (__INTERWORKING__)
ldmia sp!, {r0-r3,fp, lr} bx lr
else
ldmia sp!, {r0-r3,fp, pc}
endif
.ffi_call_SYSV_end:
UNWIND .fnend
ifdef __ELF__
.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
endif
/*
unsigned int FFI_HIDDEN ffi_closure_SYSV_inner (closure, respp, args) ffi_closure *closure; void **respp; void *args; /
ARM_FUNC_START ffi_closure_SYSV
UNWIND .pad #16 add ip, sp, #16 stmfd sp!, {ip, lr} UNWIND .save {r0, lr} add r2, sp, #8 UNWIND .pad #16 sub sp, sp, #16 str sp, [sp, #8] add r1, sp, #8 bl CNAME(ffi_closure_SYSV_inner) cmp r0, #FFI_TYPE_INT beq .Lretint cmp r0, #FFI_TYPE_FLOAT
if defined(__SOFTFP__) || defined(ARM_EABI)
beq .Lretint
else
beq .Lretfloat
endif
cmp r0, #FFI_TYPE_DOUBLE
if defined(__SOFTFP__) || defined(ARM_EABI)
beq .Lretlonglong
else
beq .Lretdouble
endif
cmp r0, #FFI_TYPE_LONGDOUBLE
if defined(__SOFTFP__) || defined(ARM_EABI)
beq .Lretlonglong
else
beq .Lretlongdouble
endif
cmp r0, #FFI_TYPE_SINT64 beq .Lretlonglong
.Lclosure_epilogue:
add sp, sp, #16 ldmfd sp, {sp, pc}
.Lretint:
ldr r0, [sp] b .Lclosure_epilogue
.Lretlonglong:
ldr r0, [sp] ldr r1, [sp, #4] b .Lclosure_epilogue
if !defined(__SOFTFP__) && !defined(ARM_EABI) .Lretfloat:
ldfs f0, [sp] b .Lclosure_epilogue
.Lretdouble:
ldfd f0, [sp] b .Lclosure_epilogue
.Lretlongdouble:
ldfd f0, [sp] b .Lclosure_epilogue
endif
.ffi_closure_SYSV_end:
UNWIND .fnend
ifdef __ELF__
.size CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)
endif
/* Below are VFP hard-float ABI call and closure implementations.
Add VFP FPU directive here. */ .fpu vfp @ r0: fn @ r1: &ecif @ r2: cif->bytes @ r3: fig->flags @ sp+0: ecif.rvalue
ARM_FUNC_START ffi_call_VFP
@ Save registers stmfd sp!, {r0-r3, fp, lr} UNWIND .save {r0-r3, fp, lr} mov fp, sp UNWIND .setfp fp, sp @ Make room for all of the new args. sub sp, sp, r2 @ Make room for loading VFP args sub sp, sp, #64 @ Place all of the ffi_prep_args in position mov r0, sp @ r1 already set sub r2, fp, #64 @ VFP scratch space @ Call ffi_prep_args(stack, &ecif, vfp_space) bl ffi_prep_args @ Load VFP register args if needed cmp r0, #0 beq LSYM(Lbase_args) @ Load only d0 if possible cmp r0, #3 sub ip, fp, #64 flddle d0, [ip] fldmiadgt ip, {d0-d7}
LSYM(Lbase_args):
@ move first 4 parameters in registers ldmia sp, {r0-r3} @ and adjust stack sub lr, ip, sp @ cif->bytes == (fp - 64) - sp ldr ip, [fp] @ load fn() in advance cmp lr, #16 movhs lr, #16 add sp, sp, lr @ call (fn) (...) call_reg(ip) @ Remove the space we pushed for the args mov sp, fp @ Load r2 with the pointer to storage for @ the return value ldr r2, [sp, #24] @ Load r3 with the return type code ldr r3, [sp, #12] @ If the return value pointer is NULL, @ assume no return value. cmp r2, #0 beq LSYM(Lepilogue_vfp) cmp r3, #FFI_TYPE_INT streq r0, [r2] beq LSYM(Lepilogue_vfp) cmp r3, #FFI_TYPE_SINT64 stmeqia r2, {r0, r1} beq LSYM(Lepilogue_vfp) cmp r3, #FFI_TYPE_FLOAT fstseq s0, [r2] beq LSYM(Lepilogue_vfp) cmp r3, #FFI_TYPE_DOUBLE fstdeq d0, [r2] beq LSYM(Lepilogue_vfp) cmp r3, #FFI_TYPE_STRUCT_VFP_FLOAT cmpne r3, #FFI_TYPE_STRUCT_VFP_DOUBLE fstmiadeq r2, {d0-d3}
LSYM(Lepilogue_vfp):
RETLDM "r0-r3,fp"
.ffi_call_VFP_end:
UNWIND .fnend .size CNAME(ffi_call_VFP),.ffi_call_VFP_end-CNAME(ffi_call_VFP)
ARM_FUNC_START ffi_closure_VFP
fstmfdd sp!, {d0-d7} @ r0-r3, then d0-d7 UNWIND .pad #80 add ip, sp, #80 stmfd sp!, {ip, lr} UNWIND .save {r0, lr} add r2, sp, #72 add r3, sp, #8 UNWIND .pad #72 sub sp, sp, #72 str sp, [sp, #64] add r1, sp, #64 bl ffi_closure_SYSV_inner cmp r0, #FFI_TYPE_INT beq .Lretint_vfp cmp r0, #FFI_TYPE_FLOAT beq .Lretfloat_vfp cmp r0, #FFI_TYPE_DOUBLE cmpne r0, #FFI_TYPE_LONGDOUBLE beq .Lretdouble_vfp cmp r0, #FFI_TYPE_SINT64 beq .Lretlonglong_vfp cmp r0, #FFI_TYPE_STRUCT_VFP_FLOAT beq .Lretfloat_struct_vfp cmp r0, #FFI_TYPE_STRUCT_VFP_DOUBLE beq .Lretdouble_struct_vfp
.Lclosure_epilogue_vfp:
add sp, sp, #72 ldmfd sp, {sp, pc}
.Lretfloat_vfp:
flds s0, [sp] b .Lclosure_epilogue_vfp
.Lretdouble_vfp:
fldd d0, [sp] b .Lclosure_epilogue_vfp
.Lretint_vfp:
ldr r0, [sp] b .Lclosure_epilogue_vfp
.Lretlonglong_vfp:
ldmia sp, {r0, r1} b .Lclosure_epilogue_vfp
.Lretfloat_struct_vfp:
fldmiad sp, {d0-d1} b .Lclosure_epilogue_vfp
.Lretdouble_struct_vfp:
fldmiad sp, {d0-d3} b .Lclosure_epilogue_vfp
.ffi_closure_VFP_end:
UNWIND .fnend .size CNAME(ffi_closure_VFP),.ffi_closure_VFP_end-CNAME(ffi_closure_VFP)
if defined __ELF__ && defined __linux__
.section .note.GNU-stack,"",%progbits
endif