mirror of
https://github.com/partic2/libffi
synced 2026-11-09 17:47:19 +00:00
Alan Modra
fa1040c111
Plus .cfi async unwind info, rearrangement of ffi_call_linux64 and ffi_call_SYSV function params to avoid register copies, tweaks to trampolines. * src/powerpc/ffitarget.h (FFI_GO_CLOSURES): Define. * src/powerpc/ffi.c (ffi_call_int): New function with extra closure param, and args rearranged on ffi_call_linux64 and ffi_call_SYSV calls, extracted from .. (ffi_call): ..here. (ffi_call_go, ffi_prep_go_closure): New functions. * src/powerpc/ffi_linux64.c (ffi_prep_closure_loc_linux64): Make hidden. Only flush insn part of ELFv2 trampoline. Don't shuffle ELFv1 trampoline. (ffi_closure_helper_LINUX64): Replace closure param with cif, fun, user_data params. * src/powerpc/ffi_powerpc.h (ffi_go_closure_sysv): Declare. (ffi_go_closure_linux64): Declare. (ffi_call_SYSV, fi_call_LINUX64): Update. (ffi_prep_closure_loc_sysv, ffi_prep_closure_loc_linux64): Declare. (ffi_closure_helper_SYSV, ffi_closure_helper_LINUX64): Update. * src/powerpc/ffi_sysv.c (ASM_NEEDS_REGISTERS): Increase to 6. (ffi_prep_closure_loc_sysv): Use bcl in trampoline, put data words last, flush just the insn part. (ffi_closure_helper_SYSV): Replace closure param with cif, fun and user_data params. * src/powerpc/linux64.S (ffi_call_LINUX64): Replace hand-written .eh_frame with .cfi directives. Adjust for changed param order. Pass extra "closure" param to user function in static chain. Add .cfi directives to describe epilogue. Don't provide traceback table for ELFv2 or _CALL_LINUX. * src/powerpc/linux64_closure.S (ffi_closure_LINUX64): Replace hand-written .eh_frame with .cfi directives. Adjust for changed ffi_closure_helper_LINUX64 params. Add .cfi directives to describe epilogue. Don't provide traceback table for ELFv2 or _CALL_LINUX. (ffi_go_closure_linux64): New function. * src/powerpc/sysv.S: Remove redundant .globl ffi_prep_args_SYSV. (ffi_call_SYSV): Make hidden. Replace hand-written .eh_frame with .cfi directives. Adjust for changed params. Pass extra "closure" param to user function in static chain. Add .cfi directives to describe epilogue. * src/powerpc/ppc_closure.S (ffi_closure_SYSV): Make hidden. Replace hand-written .eh_frame with .cfi directives. Adjust for changed ffi_closure_helper_SYSV params. Add .cfi directives to describe epilogue. Don't just use nops in the dead __NO_FPRS__ epilogues. (ffi_go_closure_sysv): New function.
176 lines
4.5 KiB
ArmAsm
176 lines
4.5 KiB
ArmAsm
/* -----------------------------------------------------------------------
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sysv.S - Copyright (c) 1998 Geoffrey Keating
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Copyright (C) 2007 Free Software Foundation, Inc
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PowerPC Assembly glue.
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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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#include <powerpc/asm.h>
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#ifndef POWERPC64
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FFI_HIDDEN(ffi_call_SYSV)
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ENTRY(ffi_call_SYSV)
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.cfi_startproc
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/* Save the old stack pointer as AP. */
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mr %r10,%r1
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.cfi_def_cfa_register 10
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/* Allocate the stack space we need. */
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stwux %r1,%r1,%r8
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/* Save registers we use. */
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mflr %r9
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stw %r28,-16(%r10)
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stw %r29,-12(%r10)
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stw %r30, -8(%r10)
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stw %r31, -4(%r10)
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stw %r9, 4(%r10)
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.cfi_offset 65, 4
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.cfi_offset 31, -4
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.cfi_offset 30, -8
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.cfi_offset 29, -12
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.cfi_offset 28, -16
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/* Save arguments over call... */
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stw %r7, -20(%r10) /* closure, */
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mr %r31,%r6 /* flags, */
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mr %r30,%r5 /* rvalue, */
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mr %r29,%r4 /* function address, */
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mr %r28,%r10 /* our AP. */
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.cfi_def_cfa_register 28
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/* Call ffi_prep_args_SYSV. */
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mr %r4,%r1
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bl ffi_prep_args_SYSV@local
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/* Now do the call. */
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/* Set up cr1 with bits 4-7 of the flags. */
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mtcrf 0x40,%r31
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/* Get the address to call into CTR. */
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mtctr %r29
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/* Load all those argument registers. */
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lwz %r3,-24-(8*4)(%r28)
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lwz %r4,-24-(7*4)(%r28)
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lwz %r5,-24-(6*4)(%r28)
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lwz %r6,-24-(5*4)(%r28)
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bf- 5,1f
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nop
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lwz %r7,-24-(4*4)(%r28)
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lwz %r8,-24-(3*4)(%r28)
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lwz %r9,-24-(2*4)(%r28)
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lwz %r10,-24-(1*4)(%r28)
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nop
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1:
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#ifndef __NO_FPRS__
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/* Load all the FP registers. */
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bf- 6,2f
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lfd %f1,-24-(8*4)-(8*8)(%r28)
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lfd %f2,-24-(8*4)-(7*8)(%r28)
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lfd %f3,-24-(8*4)-(6*8)(%r28)
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lfd %f4,-24-(8*4)-(5*8)(%r28)
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nop
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lfd %f5,-24-(8*4)-(4*8)(%r28)
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lfd %f6,-24-(8*4)-(3*8)(%r28)
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lfd %f7,-24-(8*4)-(2*8)(%r28)
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lfd %f8,-24-(8*4)-(1*8)(%r28)
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#endif
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2:
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/* Make the call. */
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lwz %r11, -20(%r28)
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bctrl
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/* Now, deal with the return value. */
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mtcrf 0x01,%r31 /* cr7 */
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bt- 31,L(small_struct_return_value)
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bt- 30,L(done_return_value)
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#ifndef __NO_FPRS__
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bt- 29,L(fp_return_value)
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#endif
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stw %r3,0(%r30)
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bf+ 28,L(done_return_value)
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stw %r4,4(%r30)
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mtcrf 0x02,%r31 /* cr6 */
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bf 27,L(done_return_value)
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stw %r5,8(%r30)
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stw %r6,12(%r30)
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/* Fall through... */
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L(done_return_value):
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/* Restore the registers we used and return. */
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lwz %r9, 4(%r28)
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lwz %r31, -4(%r28)
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mtlr %r9
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lwz %r30, -8(%r28)
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lwz %r29,-12(%r28)
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lwz %r28,-16(%r28)
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.cfi_remember_state
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/* At this point we don't have a cfa register. Say all our
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saved regs have been restored. */
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.cfi_same_value 65
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.cfi_same_value 31
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.cfi_same_value 30
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.cfi_same_value 29
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.cfi_same_value 28
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/* Hopefully this works.. */
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.cfi_def_cfa_register 1
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.cfi_offset 1, 0
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lwz %r1,0(%r1)
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.cfi_same_value 1
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blr
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#ifndef __NO_FPRS__
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L(fp_return_value):
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.cfi_restore_state
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bf 28,L(float_return_value)
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stfd %f1,0(%r30)
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mtcrf 0x02,%r31 /* cr6 */
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bf 27,L(done_return_value)
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stfd %f2,8(%r30)
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b L(done_return_value)
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L(float_return_value):
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stfs %f1,0(%r30)
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b L(done_return_value)
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#endif
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L(small_struct_return_value):
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/*
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* The C code always allocates a properly-aligned 8-byte bounce
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* buffer to make this assembly code very simple. Just write out
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* r3 and r4 to the buffer to allow the C code to handle the rest.
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*/
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stw %r3, 0(%r30)
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stw %r4, 4(%r30)
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b L(done_return_value)
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.cfi_endproc
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END(ffi_call_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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#endif
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