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/*
Package: dyncall
Library: dyncallback
File: dyncallback/dyncall_callback_x64.S
Description: Callback Thunk entry for x64 (portasm version)
License:
Copyright (c) 2011 Daniel Adler <dadler@uni-goettingen.de>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "../portasm/portasm-x64-att.S"
/* structure sizes */
SET(DCThunk_size,24)
SET(DCArgs_size_win64,80)
SET(DCArgs_size_sysv,128)
SET(DCValue_size,8)
/* frame local variable offsets relative to %rbp*/
SET(FRAME_arg0_win64,48)
SET(FRAME_arg0_sysv,16)
SET(FRAME_return,8)
SET(FRAME_parent,0)
SET(FRAME_DCArgs_sysv,-128)
SET(FRAME_DCValue_sysv,-136)
SET(FRAME_DCArgs_win64,-80)
SET(FRAME_DCValue_win64,-80)
/* struct DCCallback */
SET(CTX_thunk,0)
SET(CTX_handler,24)
SET(CTX_userdata,32)
SET(DCCallback_size,40)
/* character constants */
#define ASCII_f 102
#define ASCII_d 100
GLOBAL(dcCallback_x64_sysv)
BEGIN_PROC(dcCallback_x64_sysv)
PUSH(RBP)
MOV(RSP,RBP)
/* initialize DCArgs */
/* float parameters (8 registers spill to DCArgs) */
SUB(LIT(8*8),RSP)
MOVSD(XMM7, QWORD(RSP,8*7)) /* struct offset 120: float parameter 7 */
MOVSD(XMM6, QWORD(RSP,8*6)) /* struct offset 112: float parameter 6 */
MOVSD(XMM5, QWORD(RSP,8*5)) /* struct offset 104: float parameter 5 */
MOVSD(XMM4, QWORD(RSP,8*4)) /* struct offset 96: float parameter 4 */
MOVSD(XMM3, QWORD(RSP,8*3)) /* struct offset 88: float parameter 3 */
MOVSD(XMM2, QWORD(RSP,8*2)) /* struct offset 80: float parameter 2 */
MOVSD(XMM1, QWORD(RSP,8*1)) /* struct offset 72: float parameter 1 */
MOVSD(XMM0, QWORD(RSP,8*0)) /* struct offset 64: float parameter 0 */
/* integer parameters (6 registers spill to DCArgs) */
PUSH(R9) /* struct offset 56: parameter 5 */
PUSH(R8) /* struct offset 48: parameter 4 */
PUSH(RCX) /* struct offset 40: parameter 3 */
PUSH(RDX) /* struct offset 32: parameter 2 */
PUSH(RSI) /* struct offset 24: parameter 1 */
PUSH(RDI) /* struct offset 16: parameter 0 */
/* register counts for integer/pointer and float regs */
PUSH(LIT(0)) /* struct offset 12: fcount */
/* struct offset 8: icount */
LEA(QWORD(RBP,FRAME_arg0_sysv),RDX) /* struct offset 0: stack pointer */
PUSH(RDX)
MOV(RSP,RSI) /* arg 1 RSI : DCArgs* */
/* initialize DCValue */
PUSH(LIT(0)) /* struct offset 0: return value (max long long) */
/* call handler( *ctx, *args, *value, *userdata) */
MOV(RAX,RDI) /* arg 0 RDI : DCCallback* (RAX) */
MOV(QWORD(RDI,CTX_userdata),RCX) /* arg 3 RCX : userdata* */
MOV(RSP,RDX) /* arg 2 RDX : DCValue* */
PUSH(LIT(0)) /* align to 16 bytes */
CALL_REG(QWORD(RAX,CTX_handler))
/* pass return type via registers */
/* distinguish two basic classes 'integer' and 'float' */
MOVB(AL,DL)
MOV(QWORD(RBP,FRAME_DCValue_sysv),RAX)
CMP(LIT(ASCII_f),DL)
JE(LOCAL(return_f64))
CMP(LIT(ASCII_d),DL)
JNE(LOCAL(return_i64))
LOCAL(return_f64):
MOVD(RAX,XMM0)
LOCAL(return_i64):
MOV(RBP,RSP)
POP(RBP)
RET()
END_PROC(dcCallback_x64_sysv)
GLOBAL(dcCallback_x64_win64)
BEGIN_PROC(dcCallback_x64_win64)
PUSH(RBP)
MOV(RSP,RBP)
/* initialize DCArgs */
/* float parameters (4 registers spill to DCArgs) */
SUB(LIT(4*8),RSP)
MOVSD(XMM3, QWORD(RSP,8*3)) /* struct offset 72: float parameter 3 */
MOVSD(XMM2, QWORD(RSP,8*2)) /* struct offset 64: float parameter 2 */
MOVSD(XMM1, QWORD(RSP,8*1)) /* struct offset 56: float parameter 1 */
MOVSD(XMM0, QWORD(RSP,8*0)) /* struct offset 48: float parameter 0 */
/* integer parameters (4 registers spill to DCArgs) */
PUSH(R9) /* struct offset 40: parameter 3 */
PUSH(R8) /* struct offset 32: parameter 2 */
PUSH(RDX) /* struct offset 24: parameter 1 */
PUSH(RCX) /* struct offset 16: parameter 0 */
/* register counts for integer/pointer and float regs */
PUSH(LIT(0)) /* struct offset 12: fcount */
/* struct offset 8: icount */
LEA(QWORD(RBP,FRAME_arg0_win64),RDX) /* struct offset 0: stack pointer */
PUSH(RDX)
MOV(RSP,RDX) /* arg 1 RDX : DCArgs* */
/* initialize DCValue */
// PUSHQ(LIT(0)) /* struct offset 0: return value (max long long) */
/* call handler( *ctx, *args, *value, *userdata) */
MOV(RAX,RCX) /* arg 0 RCX : DCCallback* (RAX) */
MOV(QWORD(RAX,CTX_userdata),R9) /* arg 3 R9 : userdata* */
MOV(RSP,R8) /* arg 2 R8 : DCValue* */
SUB(LIT(4*8),RSP) /* make room for spill area and call */
CALL_REG(QWORD(RAX,CTX_handler))
MOV(QWORD(RBP,FRAME_DCValue_win64),RAX)
MOVD(RAX,XMM0)
MOV(RBP,RSP)
POP(RBP)
RET()
END_PROC(dcCallback_x64_win64)
END_ASM
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