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tci: Make tcg temporaries local to tcg_qemu_tb_exec

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We're moving away from the temporaries stored in env.  Make sure we can
differentiate between temp stores and possibly bogus stores for extra
call arguments.  Move TCG_AREG0 and TCG_REG_CALL_STACK out of the way
of the parameter passing registers.

Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off by: Stefan Weil <sw@weilnetz.de>
This commit is contained in:
Richard Henderson 2013-03-28 05:37:55 +00:00 committed by Stefan Weil
parent 4699ca6dbf
commit ee79c356ff
3 changed files with 19 additions and 7 deletions
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12
tcg/tci/tcg-target.c
View File

@ -40,11 +40,6 @@
/* Bitfield n...m (in 32 bit value). */
#define BITS(n, m) (((0xffffffffU << (31 - n)) >> (31 - n + m)) << m)
/* Used for function call generation. */
#define TCG_REG_CALL_STACK TCG_REG_R4
#define TCG_TARGET_STACK_ALIGN 16
#define TCG_TARGET_CALL_STACK_OFFSET 0
/* Macros used in tcg_target_op_defs. */
#define R "r"
#define RI "ri"
@ -901,10 +896,15 @@ static void tcg_target_init(TCGContext *s)
/* TODO: Which registers should be set here? */
tcg_regset_set32(tcg_target_call_clobber_regs, 0,
BIT(TCG_TARGET_NB_REGS) - 1);
tcg_regset_clear(s->reserved_regs);
tcg_regset_set_reg(s->reserved_regs, TCG_REG_CALL_STACK);
tcg_add_target_add_op_defs(tcg_target_op_defs);
tcg_set_frame(s, TCG_AREG0, offsetof(CPUArchState, temp_buf),
/* We use negative offsets from "sp" so that we can distinguish
stores that might pretend to be call arguments. */
tcg_set_frame(s, TCG_REG_CALL_STACK,
-CPU_TEMP_BUF_NLONGS * sizeof(long),
CPU_TEMP_BUF_NLONGS * sizeof(long));
}

8
tcg/tci/tcg-target.h
View File

@ -127,7 +127,6 @@ typedef enum {
TCG_REG_R5,
TCG_REG_R6,
TCG_REG_R7,
TCG_AREG0 = TCG_REG_R7,
#if TCG_TARGET_NB_REGS >= 16
TCG_REG_R8,
TCG_REG_R9,
@ -160,6 +159,13 @@ typedef enum {
TCG_CONST = UINT8_MAX
} TCGReg;
#define TCG_AREG0 (TCG_TARGET_NB_REGS - 2)
/* Used for function call generation. */
#define TCG_REG_CALL_STACK (TCG_TARGET_NB_REGS - 1)
#define TCG_TARGET_CALL_STACK_OFFSET 0
#define TCG_TARGET_STACK_ALIGN 16
void tci_disas(uint8_t opc);
tcg_target_ulong tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr);

6
tci.c
View File

@ -112,6 +112,7 @@ static void tci_write_reg(TCGReg index, tcg_target_ulong value)
{
assert(index < ARRAY_SIZE(tci_reg));
assert(index != TCG_AREG0);
assert(index != TCG_REG_CALL_STACK);
tci_reg[index] = value;
}
@ -435,9 +436,12 @@ static bool tci_compare64(uint64_t u0, uint64_t u1, TCGCond condition)
/* Interpret pseudo code in tb. */
tcg_target_ulong tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr)
{
long tcg_temps[CPU_TEMP_BUF_NLONGS];
uintptr_t sp_value = (uintptr_t)(tcg_temps + CPU_TEMP_BUF_NLONGS);
tcg_target_ulong next_tb = 0;
tci_reg[TCG_AREG0] = (tcg_target_ulong)env;
tci_reg[TCG_REG_CALL_STACK] = sp_value;
assert(tb_ptr);
for (;;) {
@ -585,6 +589,7 @@ tcg_target_ulong tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr)
t0 = tci_read_r32(&tb_ptr);
t1 = tci_read_r(&tb_ptr);
t2 = tci_read_s32(&tb_ptr);
assert(t1 != sp_value || (int32_t)t2 < 0);
*(uint32_t *)(t1 + t2) = t0;
break;
@ -869,6 +874,7 @@ tcg_target_ulong tcg_qemu_tb_exec(CPUArchState *env, uint8_t *tb_ptr)
t0 = tci_read_r64(&tb_ptr);
t1 = tci_read_r(&tb_ptr);
t2 = tci_read_s32(&tb_ptr);
assert(t1 != sp_value || (int32_t)t2 < 0);
*(uint64_t *)(t1 + t2) = t0;
break;