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fixed global variable handling with qemu load/stores - initial global prologue/epilogue implementation

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git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4406 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2008-05-10 10:52:05 +00:00
parent 4d7a0880ca
commit b03cce8e08
4 changed files with 219 additions and 62 deletions
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52
tcg/i386/tcg-target.c
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@ -46,6 +46,8 @@ int tcg_target_reg_alloc_order[] = {
const int tcg_target_call_iarg_regs[3] = { TCG_REG_EAX, TCG_REG_EDX, TCG_REG_ECX };
const int tcg_target_call_oarg_regs[2] = { TCG_REG_EAX, TCG_REG_EDX };
static uint8_t *tb_ret_addr;
static void patch_reloc(uint8_t *code_ptr, int type,
tcg_target_long value, tcg_target_long addend)
{
@ -879,7 +881,8 @@ static inline void tcg_out_op(TCGContext *s, int opc,
switch(opc) {
case INDEX_op_exit_tb:
tcg_out_movi(s, TCG_TYPE_I32, TCG_REG_EAX, args[0]);
tcg_out8(s, 0xc3); /* ret */
tcg_out8(s, 0xe9); /* jmp tb_ret_addr */
tcg_out32(s, tb_ret_addr - s->code_ptr - 4);
break;
case INDEX_op_goto_tb:
if (s->tb_jmp_offset) {
@ -1145,6 +1148,53 @@ static const TCGTargetOpDef x86_op_defs[] = {
{ -1 },
};
static int tcg_target_callee_save_regs[] = {
/* TCG_REG_EBP, */ /* currently used for the global env, so no
need to save */
TCG_REG_EBX,
TCG_REG_ESI,
TCG_REG_EDI,
};
static inline void tcg_out_push(TCGContext *s, int reg)
{
tcg_out_opc(s, 0x50 + reg);
}
static inline void tcg_out_pop(TCGContext *s, int reg)
{
tcg_out_opc(s, 0x58 + reg);
}
/* Generate global QEMU prologue and epilogue code */
void tcg_target_qemu_prologue(TCGContext *s)
{
int i, frame_size, push_size, stack_addend;
/* TB prologue */
/* save all callee saved registers */
for(i = 0; i < ARRAY_SIZE(tcg_target_callee_save_regs); i++) {
tcg_out_push(s, tcg_target_callee_save_regs[i]);
}
/* reserve some stack space */
push_size = 4 + ARRAY_SIZE(tcg_target_callee_save_regs) * 4;
frame_size = push_size + TCG_STATIC_CALL_ARGS_SIZE;
frame_size = (frame_size + TCG_TARGET_STACK_ALIGN - 1) &
~(TCG_TARGET_STACK_ALIGN - 1);
stack_addend = frame_size - push_size;
tcg_out_addi(s, TCG_REG_ESP, -stack_addend);
tcg_out_modrm(s, 0xff, 4, TCG_REG_EAX); /* jmp *%eax */
/* TB epilogue */
tb_ret_addr = s->code_ptr;
tcg_out_addi(s, TCG_REG_ESP, stack_addend);
for(i = ARRAY_SIZE(tcg_target_callee_save_regs) - 1; i >= 0; i--) {
tcg_out_pop(s, tcg_target_callee_save_regs[i]);
}
tcg_out8(s, 0xc3); /* ret */
}
void tcg_target_init(TCGContext *s)
{
/* fail safe */