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https://github.com/partic2/libffi
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Initial commit
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Anthony Green
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/* -----------------------------------------------------------------------
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sysv.S - Copyright (c) 1998, 2008 Red Hat, Inc.
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ARM Foreign Function Interface
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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``Software''), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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----------------------------------------------------------------------- */
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#define LIBFFI_ASM
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#include <fficonfig.h>
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#include <ffi.h>
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#ifdef HAVE_MACHINE_ASM_H
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#include <machine/asm.h>
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#else
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#ifdef __USER_LABEL_PREFIX__
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#define CONCAT1(a, b) CONCAT2(a, b)
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#define CONCAT2(a, b) a ## b
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/* Use the right prefix for global labels. */
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#define CNAME(x) CONCAT1 (__USER_LABEL_PREFIX__, x)
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#else
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#define CNAME(x) x
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#endif
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#define ENTRY(x) .globl CNAME(x); .type CNAME(x),%function; CNAME(x):
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#endif
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#ifdef __ELF__
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#define LSYM(x) .x
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#else
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#define LSYM(x) x
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#endif
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/* We need a better way of testing for this, but for now, this is all
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we can do. */
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@ This selects the minimum architecture level required.
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#define __ARM_ARCH__ 3
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#if defined(__ARM_ARCH_4__) || defined(__ARM_ARCH_4T__)
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# undef __ARM_ARCH__
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# define __ARM_ARCH__ 4
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#endif
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#if defined(__ARM_ARCH_5__) || defined(__ARM_ARCH_5T__) \
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|| defined(__ARM_ARCH_5E__) || defined(__ARM_ARCH_5TE__) \
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|| defined(__ARM_ARCH_5TEJ__)
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# undef __ARM_ARCH__
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# define __ARM_ARCH__ 5
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#endif
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#if defined(__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
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|| defined(__ARM_ARCH_6K__) || defined(__ARM_ARCH_6Z__) \
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|| defined(__ARM_ARCH_6ZK__) || defined(__ARM_ARCH_6T2__) \
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|| defined(__ARM_ARCH_6M__)
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# undef __ARM_ARCH__
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# define __ARM_ARCH__ 6
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#endif
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#if defined(__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
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|| defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__)
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# undef __ARM_ARCH__
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# define __ARM_ARCH__ 7
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#endif
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#if __ARM_ARCH__ >= 5
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# define call_reg(x) blx x
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#elif defined (__ARM_ARCH_4T__)
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# define call_reg(x) mov lr, pc ; bx x
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# if defined(__thumb__) || defined(__THUMB_INTERWORK__)
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# define __INTERWORKING__
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# endif
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#else
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# define call_reg(x) mov lr, pc ; mov pc, x
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#endif
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/* Conditionally compile unwinder directives. */
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#ifdef __ARM_EABI__
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#define UNWIND
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#else
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#define UNWIND @
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#endif
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#if defined(__thumb__) && !defined(__THUMB_INTERWORK__)
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.macro ARM_FUNC_START name
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.text
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.align 0
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.thumb
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.thumb_func
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ENTRY(\name)
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bx pc
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nop
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.arm
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UNWIND .fnstart
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/* A hook to tell gdb that we've switched to ARM mode. Also used to call
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directly from other local arm routines. */
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_L__\name:
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.endm
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#else
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.macro ARM_FUNC_START name
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.text
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.align 0
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.arm
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ENTRY(\name)
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UNWIND .fnstart
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.endm
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#endif
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.macro RETLDM regs=, cond=, dirn=ia
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#if defined (__INTERWORKING__)
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.ifc "\regs",""
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ldr\cond lr, [sp], #4
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.else
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ldm\cond\dirn sp!, {\regs, lr}
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.endif
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bx\cond lr
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#else
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.ifc "\regs",""
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ldr\cond pc, [sp], #4
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.else
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ldm\cond\dirn sp!, {\regs, pc}
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.endif
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#endif
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.endm
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@ r0: ffi_prep_args
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@ r1: &ecif
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@ r2: cif->bytes
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@ r3: fig->flags
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@ sp+0: ecif.rvalue
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@ sp+4: fn
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@ This assumes we are using gas.
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ARM_FUNC_START ffi_call_SYSV
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@ Save registers
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stmfd sp!, {r0-r3, fp, lr}
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UNWIND .save {r0-r3, fp, lr}
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mov fp, sp
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UNWIND .setfp fp, sp
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@ Make room for all of the new args.
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sub sp, fp, r2
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@ Place all of the ffi_prep_args in position
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mov ip, r0
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mov r0, sp
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@ r1 already set
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@ Call ffi_prep_args(stack, &ecif)
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call_reg(ip)
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@ move first 4 parameters in registers
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ldmia sp, {r0-r3}
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@ and adjust stack
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ldr ip, [fp, #8]
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cmp ip, #16
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movhs ip, #16
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add sp, sp, ip
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@ call (fn) (...)
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ldr ip, [fp, #28]
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call_reg(ip)
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@ Remove the space we pushed for the args
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mov sp, fp
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@ Load r2 with the pointer to storage for the return value
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ldr r2, [sp, #24]
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@ Load r3 with the return type code
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ldr r3, [sp, #12]
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@ If the return value pointer is NULL, assume no return value.
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cmp r2, #0
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beq LSYM(Lepilogue)
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@ return INT
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cmp r3, #FFI_TYPE_INT
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#if defined(__SOFTFP__) || defined(__ARM_EABI__)
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cmpne r3, #FFI_TYPE_FLOAT
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#endif
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streq r0, [r2]
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beq LSYM(Lepilogue)
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@ return INT64
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cmp r3, #FFI_TYPE_SINT64
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#if defined(__SOFTFP__) || defined(__ARM_EABI__)
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cmpne r3, #FFI_TYPE_DOUBLE
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#endif
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stmeqia r2, {r0, r1}
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#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
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beq LSYM(Lepilogue)
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@ return FLOAT
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cmp r3, #FFI_TYPE_FLOAT
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stfeqs f0, [r2]
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beq LSYM(Lepilogue)
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@ return DOUBLE or LONGDOUBLE
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cmp r3, #FFI_TYPE_DOUBLE
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stfeqd f0, [r2]
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#endif
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LSYM(Lepilogue):
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RETLDM "r0-r3,fp"
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.ffi_call_SYSV_end:
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UNWIND .fnend
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.size CNAME(ffi_call_SYSV),.ffi_call_SYSV_end-CNAME(ffi_call_SYSV)
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/*
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unsigned int FFI_HIDDEN
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ffi_closure_SYSV_inner (closure, respp, args)
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ffi_closure *closure;
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void **respp;
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void *args;
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*/
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ARM_FUNC_START ffi_closure_SYSV
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UNWIND .pad #16
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add ip, sp, #16
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stmfd sp!, {ip, lr}
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UNWIND .save {r0, lr}
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add r2, sp, #8
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.pad #16
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sub sp, sp, #16
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str sp, [sp, #8]
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add r1, sp, #8
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bl ffi_closure_SYSV_inner
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cmp r0, #FFI_TYPE_INT
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beq .Lretint
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cmp r0, #FFI_TYPE_FLOAT
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#if defined(__SOFTFP__) || defined(__ARM_EABI__)
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beq .Lretint
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#else
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beq .Lretfloat
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#endif
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cmp r0, #FFI_TYPE_DOUBLE
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#if defined(__SOFTFP__) || defined(__ARM_EABI__)
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beq .Lretlonglong
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#else
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beq .Lretdouble
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#endif
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cmp r0, #FFI_TYPE_LONGDOUBLE
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#if defined(__SOFTFP__) || defined(__ARM_EABI__)
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beq .Lretlonglong
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#else
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beq .Lretlongdouble
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#endif
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cmp r0, #FFI_TYPE_SINT64
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beq .Lretlonglong
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.Lclosure_epilogue:
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add sp, sp, #16
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ldmfd sp, {sp, pc}
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.Lretint:
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ldr r0, [sp]
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b .Lclosure_epilogue
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.Lretlonglong:
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ldr r0, [sp]
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ldr r1, [sp, #4]
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b .Lclosure_epilogue
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#if !defined(__SOFTFP__) && !defined(__ARM_EABI__)
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.Lretfloat:
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ldfs f0, [sp]
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b .Lclosure_epilogue
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.Lretdouble:
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ldfd f0, [sp]
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b .Lclosure_epilogue
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.Lretlongdouble:
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ldfd f0, [sp]
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b .Lclosure_epilogue
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#endif
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.ffi_closure_SYSV_end:
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UNWIND .fnend
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.size CNAME(ffi_closure_SYSV),.ffi_closure_SYSV_end-CNAME(ffi_closure_SYSV)
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#if defined __ELF__ && defined __linux__
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.section .note.GNU-stack,"",%progbits
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#endif
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