📄 arm2x86_coproc.c

📁 这是Skyeye 0.9 版本的源代码
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#include "armdefs.h"
#include "arm2x86_self.h"

//--------------------------------------------------------------------------------------------------

void
tea_ldc(ARMul_State * state, uint32_t insn, uint32_t address)
{
	ARMword		cp_num = (insn >> 8) & 0xf;
	unsigned	cpab;
	ARMword		data;

	if (!CP_ACCESS_ALLOWED (state, cp_num)) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	cpab = (state->LDC[cp_num])(state, ARMul_FIRST, insn, 0);
	while(cpab == ARMul_BUSY) {
		//XXX teawater:howto deal with it ?
		//ARMul_Icycles(state, 1, 0);
		if (arm2x86_exception(state)) {
			cpab = (state->LDC[cp_num])(state, ARMul_INTERRUPT, insn, 0);
			return;
		}
		cpab = (state->LDC[cp_num])(state, ARMul_BUSY, insn, 0);
	}
	if (cpab == ARMul_CANT) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	cpab = (state->LDC[cp_num])(state, ARMul_TRANSFER, insn, 0);
	//XXX teawater:howto deal with BUSUSEDINCPCN ?
	do {
		data = ARMul_ReadWord(state, address);
		if (state->abortSig != LOW) {
			state->trap = TRAP_DATA_ABORT;
			return;
		}
		cpab = (state->LDC[cp_num])(state, ARMul_DATA, insn, data);
		address += 4;
	} while(cpab == ARMul_INC);
}

void
tea_stc(ARMul_State * state, uint32_t insn, uint32_t address)
{
	ARMword		cp_num = (insn >> 8) & 0xf;
	unsigned	cpab;
	ARMword		data;

	if (!CP_ACCESS_ALLOWED (state, cp_num)) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	cpab = (state->STC[cp_num])(state, ARMul_FIRST, insn, &data);
	while(cpab == ARMul_BUSY) {
		//XXX teawater:howto deal with it ?
		//ARMul_Icycles(state, 1, 0);
		if (arm2x86_exception(state)) {
			cpab = (state->STC[cp_num])(state, ARMul_INTERRUPT, insn, 0);
			return;
		}
		cpab = (state->STC[cp_num])(state, ARMul_BUSY, insn, &data);
	}
	if (cpab == ARMul_CANT) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	//XXX teawater:howto deal with BUSUSEDINCPCN ?
	do {
		cpab = (state->STC[cp_num])(state, ARMul_DATA, insn, &data);
		ARMul_WriteWord(state, address, data);
		if (state->abortSig != LOW) {
			state->trap = TRAP_DATA_ABORT;
			return;
		}
		address += 4;
	} while(cpab == ARMul_INC);
}

void
tea_mrc(ARMul_State * state, uint32_t insn, uint32_t cp_num)
{
	unsigned	cpab;
	ARMword		result = 0;
	ARMword		rd;

	if (!CP_ACCESS_ALLOWED (state, cp_num)) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	cpab = (state->MRC[cp_num])(state, ARMul_FIRST, insn, &result);
	while(cpab == ARMul_BUSY) {
		//XXX teawater:howto deal with it ?
		//ARMul_Icycles(state, 1, 0);
		if (arm2x86_exception(state)) {
			cpab = (state->MRC[cp_num])(state, ARMul_INTERRUPT, insn, 0);
			return;
		}
		cpab = (state->MRC[cp_num])(state, ARMul_BUSY, insn, &result);
	}
	if (cpab == ARMul_CANT) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	//XXX teawater:howto deal with BUSUSEDINCPCN and so on ?
	rd = (insn >> 12) & 0xf;
	if (rd == 15) {
		st->Reg[15] = (result & (~3)) + 4;
		state->trap = TRAP_SET_R15;
	}
	else {
		state->Reg[rd] = result;
	}
}

void
tea_mcr(ARMul_State * state, uint32_t insn, uint32_t cp_num)
{
	unsigned	cpab;
	ARMword		source;

	if (!CP_ACCESS_ALLOWED (state, cp_num)) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	source = state->Reg[(insn >> 12) & 0xf];
	cpab = (state->MCR[cp_num])(state, ARMul_FIRST, insn, source);
	while(cpab == ARMul_BUSY) {
		//XXX teawater:howto deal with it ?
		//ARMul_Icycles(state, 1, 0);
		if (arm2x86_exception(state)) {
			cpab = (state->MCR[cp_num])(state, ARMul_INTERRUPT, insn, 0);
			return;
		}
		cpab = (state->MCR[cp_num])(state, ARMul_BUSY, insn, source);
	}
	if (cpab == ARMul_CANT) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	//XXX teawater:howto deal with BUSUSEDINCPCN and so on ?
}

void
tea_cdp(ARMul_State * state, uint32_t insn, uint32_t cp_num)
{
	unsigned	cpab;

	if (!CP_ACCESS_ALLOWED (state, cp_num)) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	cpab = (state->CDP[cp_num])(state, ARMul_FIRST, insn);
	while(cpab == ARMul_BUSY) {
		//XXX teawater:howto deal with it ?
		//ARMul_Icycles(state, 1, 0);
		if (arm2x86_exception(state)) {
			cpab = (state->CDP[cp_num])(state, ARMul_INTERRUPT, insn);
			return;
		}
		cpab = (state->CDP[cp_num])(state, ARMul_BUSY, insn);
	}
	if (cpab == ARMul_CANT) {
		state->trap = TRAP_INSN_UNDEF;
		return;
	}
	//XXX teawater:howto deal with BUSUSEDINCPCN and so on ?
}

//--------------------------------------------------------------------------------------------------

uint8_t *
get_op_ldc_T0_T1(int *len)
{
	unsigned int	begin=0,end=0;

	OP_BEGIN("get_op_ldc_T0_T1");
	//tea_ldc(st, T0, T1);
	__asm__ __volatile__ ("subl	$0x4, %esp");
	__asm__ __volatile__ ("push	%"AREG_T1);
	__asm__ __volatile__ ("push	%"AREG_T0);
	__asm__ __volatile__ ("push	%"AREG_st);
	T2 = (uint32_t)tea_ldc;
	__asm__ __volatile__ ("call	*%"AREG_T2);
	__asm__ __volatile__ ("addl	$0x10, %esp");
	if (st->trap) {
		__asm__ __volatile__ ("ret");
	}
	OP_END("get_op_ldc_T0_T1");
	*len = end - begin;

	return((uint8_t *)begin);
}

uint8_t *
get_op_stc_T0_T1(int *len)
{
	unsigned int	begin=0,end=0;

	OP_BEGIN("get_op_stc_T0_T1");
	//tea_stc(st, T0, T1);
	__asm__ __volatile__ ("subl	$0x4, %esp");
	__asm__ __volatile__ ("push	%"AREG_T1);
	__asm__ __volatile__ ("push	%"AREG_T0);
	__asm__ __volatile__ ("push	%"AREG_st);
	T2 = (uint32_t)tea_stc;
	__asm__ __volatile__ ("call	*%"AREG_T2);
	__asm__ __volatile__ ("addl	$0x10, %esp");
	if (st->trap) {
		__asm__ __volatile__ ("ret");
	}
	OP_END("get_op_stc_T0_T1");
	*len = end - begin;

	return((uint8_t *)begin);
}

uint8_t *
get_op_mrc_T0_T1(int *len)
{
	unsigned int	begin=0,end=0;

	OP_BEGIN("get_op_mrc_T0_T1");
	//tea_mrc(st, T0, T1);
	__asm__ __volatile__ ("subl	$0x4, %esp");
	__asm__ __volatile__ ("push	%"AREG_T1);
	__asm__ __volatile__ ("push	%"AREG_T0);
	__asm__ __volatile__ ("push	%"AREG_st);
	T2 = (uint32_t)tea_mrc;
	__asm__ __volatile__ ("call	*%"AREG_T2);
	__asm__ __volatile__ ("addl	$0x10, %esp");
	if (st->trap) {
		__asm__ __volatile__ ("ret");
	}
	OP_END("get_op_mrc_T0_T1");
	*len = end - begin;

	return((uint8_t *)begin);
}

uint8_t *
get_op_mcr_T0_T1(int *len)
{
	unsigned int	begin=0,end=0;

	OP_BEGIN("get_op_mcr_T0_T1");
	//tea_mcr(st, T0, T1);
	__asm__ __volatile__ ("subl	$0x4, %esp");
	__asm__ __volatile__ ("push	%"AREG_T1);
	__asm__ __volatile__ ("push	%"AREG_T0);
	__asm__ __volatile__ ("push	%"AREG_st);
	T2 = (uint32_t)tea_mcr;
	__asm__ __volatile__ ("call	*%"AREG_T2);
	__asm__ __volatile__ ("addl	$0x10, %esp");
	if (st->trap) {
		__asm__ __volatile__ ("ret");
	}
	OP_END("get_op_mcr_T0_T1");
	*len = end - begin;

	return((uint8_t *)begin);
}

uint8_t *
get_op_cdp_T0_T1(int *len)
{
	unsigned int	begin=0,end=0;

	OP_BEGIN("get_op_cdp_T0_T1");
	//tea_cdp(st, T0, T1);
	__asm__ __volatile__ ("subl	$0x4, %esp");
	__asm__ __volatile__ ("push	%"AREG_T1);
	__asm__ __volatile__ ("push	%"AREG_T0);
	__asm__ __volatile__ ("push	%"AREG_st);
	T2 = (uint32_t)tea_cdp;
	__asm__ __volatile__ ("call	*%"AREG_T2);
	__asm__ __volatile__ ("addl	$0x10, %esp");
	if (st->trap) {
		__asm__ __volatile__ ("ret");
	}
	OP_END("get_op_cdp_T0_T1");
	*len = end - begin;

	return((uint8_t *)begin);
}

op_table_t	op_ldc_T0_T1;
op_table_t	op_stc_T0_T1;
op_table_t	op_mrc_T0_T1;
op_table_t	op_mcr_T0_T1;
op_table_t	op_cdp_T0_T1;

//--------------------------------------------------------------------------------------------------
int
arm2x86_coproc_init()
{
	op_ldc_T0_T1.op = get_op_ldc_T0_T1(&op_ldc_T0_T1.len);
	if (op_ldc_T0_T1.len <= 0)
		return(-1);

	op_stc_T0_T1.op = get_op_stc_T0_T1(&op_stc_T0_T1.len);
	if (op_stc_T0_T1.len <= 0)
		return(-1);

	op_mrc_T0_T1.op = get_op_mrc_T0_T1(&op_mrc_T0_T1.len);
	if (op_mrc_T0_T1.len <= 0)
		return(-1);

	op_mcr_T0_T1.op = get_op_mcr_T0_T1(&op_mcr_T0_T1.len);
	if (op_mcr_T0_T1.len <= 0)
		return(-1);

	op_cdp_T0_T1.op = get_op_cdp_T0_T1(&op_cdp_T0_T1.len);
	if (op_cdp_T0_T1.len <= 0)
		return(-1);

	return(0);
}
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