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COS: Implement PPC va_list, va_arg and update related functions

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Exzap 2024-08-13 01:00:49 +02:00
parent 9812a47cb1
commit e02cc42d67
5 changed files with 182 additions and 71 deletions
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83
src/Cafe/OS/common/OSCommon.h
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@ -23,3 +23,86 @@ void osLib_returnFromFunction64(PPCInterpreter_t* hCPU, uint64 returnValue64);
// utility functions
#include "Cafe/OS/common/OSUtil.h"
// va_list
struct ppc_va_list
{
uint8be gprIndex;
uint8be fprIndex;
uint8be _padding2[2];
MEMPTR<uint8be> overflow_arg_area;
MEMPTR<uint8be> reg_save_area;
};
static_assert(sizeof(ppc_va_list) == 0xC);
struct ppc_va_list_reg_storage
{
uint32be gpr_save_area[8]; // 32 bytes, r3 to r10
float64be fpr_save_area[8]; // 64 bytes, f1 to f8
ppc_va_list vargs;
uint32be padding;
};
static_assert(sizeof(ppc_va_list_reg_storage) == 0x70);
// Equivalent of va_start for PPC HLE functions. Must be called before any StackAllocator<> definitions
#define ppc_define_va_list(__gprIndex, __fprIndex) \
MPTR vaOriginalR1 = PPCInterpreter_getCurrentInstance()->gpr[1]; \
StackAllocator<ppc_va_list_reg_storage> va_list_storage; \
for(int i=3; i<=10; i++) va_list_storage->gpr_save_area[i-3] = PPCInterpreter_getCurrentInstance()->gpr[i]; \
for(int i=1; i<=8; i++) va_list_storage->fpr_save_area[i-1] = PPCInterpreter_getCurrentInstance()->fpr[i].fp0; \
va_list_storage->vargs.gprIndex = __gprIndex; \
va_list_storage->vargs.fprIndex = __fprIndex; \
va_list_storage->vargs.reg_save_area = (uint8be*)&va_list_storage; \
va_list_storage->vargs.overflow_arg_area = {vaOriginalR1 + 8}; \
ppc_va_list& vargs = va_list_storage->vargs;
enum class ppc_va_type
{
INT32 = 1,
INT64 = 2,
FLOAT_OR_DOUBLE = 3,
};
static void* _ppc_va_arg(ppc_va_list* vargs, ppc_va_type argType)
{
void* r;
switch ( argType )
{
default:
cemu_assert_suspicious();
case ppc_va_type::INT32:
if ( vargs[0].gprIndex < 8u )
{
r = &vargs->reg_save_area[4 * vargs->gprIndex];
vargs->gprIndex++;
return r;
}
r = vargs->overflow_arg_area;
vargs->overflow_arg_area += 4;
return r;
case ppc_va_type::INT64:
if ( (vargs->gprIndex & 1) != 0 )
vargs->gprIndex++;
if ( vargs->gprIndex < 8 )
{
r = &vargs->reg_save_area[4 * vargs->gprIndex];
vargs->gprIndex += 2;
return r;
}
vargs->overflow_arg_area = {(vargs->overflow_arg_area.GetMPTR()+7) & 0xFFFFFFF8};
r = vargs->overflow_arg_area;
vargs->overflow_arg_area += 8;
return r;
case ppc_va_type::FLOAT_OR_DOUBLE:
if ( vargs->fprIndex < 8 )
{
r = &vargs->reg_save_area[0x20 + 8 * vargs->fprIndex];
vargs->fprIndex++;
return r;
}
vargs->overflow_arg_area = {(vargs->overflow_arg_area.GetMPTR()+7) & 0xFFFFFFF8};
r = vargs->overflow_arg_area;
vargs->overflow_arg_area += 8;
return r;
}
}