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// *****************************************************************
//
// The Compcert verified compiler
//
// Xavier Leroy, Collège de France and INRIA Paris
//
// Copyright (c) Institut National de Recherche en Informatique et
// en Automatique.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT
// HOLDER> BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// *********************************************************************
// Helper functions for variadic functions <stdarg.h>. AArch64 version.
#include "sysdeps.h"
// For the standard ABI:
// struct __va_list {
// void *__stack; // next stack parameter
// void *__gr_top; // top of the save area for int regs
// void *__vr_top; // top of the save area for float regs
// int__gr_offs; // offset from gr_top to next int reg
// int__vr_offs; // offset from gr_top to next FP reg
// }
// typedef struct __va_list va_list; // struct passed by reference
// For the Apple ABI:
// typedef char * va_list; // a single pointer passed by reference
// // points to the next parameter, always on stack
// In both cases:
// unsigned int __compcert_va_int32(va_list * ap);
// unsigned long long __compcert_va_int64(va_list * ap);
// double __compcert_va_float64(va_list * ap);
#ifdef ABI_standard
FUNCTION(__compcert_va_int32)
ldr w1, [x0, #24] // w1 = gr_offs
cbz w1, 1f
// gr_offs is not zero: load from int save area and update gr_offs
ldr x2, [x0, #8] // x2 = gr_top
ldr w2, [x2, w1, sxtw] // w2 = the next integer
add w1, w1, #8
str w1, [x0, #24] // update gr_offs
mov w0, w2
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr w2, [x1, #0] // w2 = the next integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov w0, w2
ret
ENDFUNCTION(__compcert_va_int32)
FUNCTION(__compcert_va_int64)
ldr w1, [x0, #24] // w1 = gr_offs
cbz w1, 1f
// gr_offs is not zero: load from int save area and update gr_offs
ldr x2, [x0, #8] // x2 = gr_top
ldr x2, [x2, w1, sxtw] // x2 = the next long integer
add w1, w1, #8
str w1, [x0, #24] // update gr_offs
mov x0, x2
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr x2, [x1, #0] // x2 = the next long integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov x0, x2
ret
ENDFUNCTION(__compcert_va_int64)
FUNCTION(__compcert_va_float64)
ldr w1, [x0, #28] // w1 = vr_offs
cbz w1, 1f
// vr_offs is not zero: load from float save area and update vr_offs
ldr x2, [x0, #16] // x2 = vr_top
ldr d0, [x2, w1, sxtw] // d0 = the next float
add w1, w1, #16
str w1, [x0, #28] // update vr_offs
ret
// gr_offs is zero: load from stack save area and update stack pointer
1: ldr x1, [x0, #0] // x1 = stack
ldr d0, [x1, #0] // d0 = the next float
add x1, x1, #8
str x1, [x0, #0] // update stack
ret
ENDFUNCTION(__compcert_va_float64)
#endif
#ifdef ABI_apple
FUNCTION(__compcert_va_int32)
ldr x1, [x0, #0] // x1 = stack pointer
ldr w2, [x1, #0] // w2 = the next integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov w0, w2
ret
ENDFUNCTION(__compcert_va_int32)
FUNCTION(__compcert_va_int64)
ldr x1, [x0, #0] // x1 = stack pointer
ldr x2, [x1, #0] // x2 = the next long integer
add x1, x1, #8
str x1, [x0, #0] // update stack
mov x0, x2
ret
ENDFUNCTION(__compcert_va_int64)
FUNCTION(__compcert_va_float64)
ldr x1, [x0, #0] // x1 = stack pointer
ldr d0, [x1, #0] // d0 = the next float
add x1, x1, #8
str x1, [x0, #0] // update stack
ret
ENDFUNCTION(__compcert_va_float64)
#endif
// Right now we pass structs by reference. This is not ABI conformant.
FUNCTION(__compcert_va_composite)
b GLOB(__compcert_va_int64)
ENDFUNCTION(__compcert_va_composite)
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