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authorbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2008-05-10 10:52:05 +0000
committerbellard <bellard@c046a42c-6fe2-441c-8c8c-71466251a162>2008-05-10 10:52:05 +0000
commitb03cce8e08237bb84735aa86aea5d7d7c4633e2d (patch)
treec9fda19e0192b62af3882b9f4e01b397adf6f33c /tcg/x86_64
parent4d7a0880ca35ea95d30583d137b1558d4dd166bc (diff)
fixed global variable handling with qemu load/stores - initial global prologue/epilogue implementation
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4406 c046a42c-6fe2-441c-8c8c-71466251a162
Diffstat (limited to 'tcg/x86_64')
-rw-r--r--tcg/x86_64/tcg-target.c65
1 files changed, 60 insertions, 5 deletions
diff --git a/tcg/x86_64/tcg-target.c b/tcg/x86_64/tcg-target.c
index 480ffcbc27..a3114e5f99 100644
--- a/tcg/x86_64/tcg-target.c
+++ b/tcg/x86_64/tcg-target.c
@@ -73,6 +73,8 @@ const int tcg_target_call_oarg_regs[2] = {
TCG_REG_RDX
};
+static uint8_t *tb_ret_addr;
+
static void patch_reloc(uint8_t *code_ptr, int type,
tcg_target_long value, tcg_target_long addend)
{
@@ -841,7 +843,8 @@ static inline void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
switch(opc) {
case INDEX_op_exit_tb:
tcg_out_movi(s, TCG_TYPE_PTR, TCG_REG_RAX, 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) {
@@ -1129,6 +1132,58 @@ static inline void tcg_out_op(TCGContext *s, int opc, const TCGArg *args,
}
}
+static int tcg_target_callee_save_regs[] = {
+ TCG_REG_R10,
+ TCG_REG_R11,
+ TCG_REG_RBP,
+ TCG_REG_RBX,
+ TCG_REG_R12,
+ TCG_REG_R13,
+ /* TCG_REG_R14, */ /* currently used for the global env, so no
+ need to save */
+ TCG_REG_R15,
+};
+
+static inline void tcg_out_push(TCGContext *s, int reg)
+{
+ tcg_out_opc(s, (0x50 + (reg & 7)), 0, reg, 0);
+}
+
+static inline void tcg_out_pop(TCGContext *s, int reg)
+{
+ tcg_out_opc(s, (0x58 + (reg & 7)), 0, reg, 0);
+}
+
+/* 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 = 8 + ARRAY_SIZE(tcg_target_callee_save_regs) * 8;
+ 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_RSP, -stack_addend);
+
+ tcg_out_modrm(s, 0xff, 4, TCG_REG_RDI); /* jmp *%rdi */
+
+ /* TB epilogue */
+ tb_ret_addr = s->code_ptr;
+ tcg_out_addi(s, TCG_REG_RSP, 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 */
+}
+
static const TCGTargetOpDef x86_64_op_defs[] = {
{ INDEX_op_exit_tb, { } },
{ INDEX_op_goto_tb, { } },
@@ -1212,6 +1267,10 @@ static const TCGTargetOpDef x86_64_op_defs[] = {
void tcg_target_init(TCGContext *s)
{
+ /* fail safe */
+ if ((1 << CPU_TLB_ENTRY_BITS) != sizeof(CPUTLBEntry))
+ tcg_abort();
+
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I32], 0, 0xffff);
tcg_regset_set32(tcg_target_available_regs[TCG_TYPE_I64], 0, 0xffff);
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
@@ -1227,10 +1286,6 @@ void tcg_target_init(TCGContext *s)
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_RSP);
- /* XXX: will be suppresed when proper global TB entry code will be
- generated */
- tcg_regset_set_reg(s->reserved_regs, TCG_REG_RBX);
- tcg_regset_set_reg(s->reserved_regs, TCG_REG_RBP);
tcg_add_target_add_op_defs(x86_64_op_defs);
}