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tcg/riscv: Split out target constraints to tcg-target-con-str.h

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Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2020-10-16 19:12:36 -07:00
parent 51800e4346
commit fc63a4c5c8
3 changed files with 35 additions and 39 deletions
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21
tcg/riscv/tcg-target-con-str.h Normal file
View file

@ -0,0 +1,21 @@
/* SPDX-License-Identifier: MIT */
/*
* Define RISC-V target-specific operand constraints.
* Copyright (c) 2021 Linaro
*/
/*
* Define constraint letters for register sets:
* REGS(letter, register_mask)
*/
REGS('r', ALL_GENERAL_REGS)
REGS('L', ALL_GENERAL_REGS & ~SOFTMMU_RESERVE_REGS)
/*
* Define constraint letters for constants:
* CONST(letter, TCG_CT_CONST_* bit set)
*/
CONST('I', TCG_CT_CONST_S12)
CONST('N', TCG_CT_CONST_N12)
CONST('M', TCG_CT_CONST_M12)
CONST('Z', TCG_CT_CONST_ZERO)

52
tcg/riscv/tcg-target.c.inc
View file

@ -122,6 +122,19 @@ static const int tcg_target_call_oarg_regs[] = {
#define TCG_CT_CONST_N12 0x400
#define TCG_CT_CONST_M12 0x800
#define ALL_GENERAL_REGS MAKE_64BIT_MASK(0, 32)
/*
* For softmmu, we need to avoid conflicts with the first 5
* argument registers to call the helper. Some of these are
* also used for the tlb lookup.
*/
#ifdef CONFIG_SOFTMMU
#define SOFTMMU_RESERVE_REGS MAKE_64BIT_MASK(TCG_REG_A0, 5)
#else
#define SOFTMMU_RESERVE_REGS 0
#endif
static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
{
if (TCG_TARGET_REG_BITS == 32) {
@ -131,45 +144,6 @@ static inline tcg_target_long sextreg(tcg_target_long val, int pos, int len)
}
}
/* parse target specific constraints */
static const char *target_parse_constraint(TCGArgConstraint *ct,
const char *ct_str, TCGType type)
{
switch (*ct_str++) {
case 'r':
ct->regs = 0xffffffff;
break;
case 'L':
/* qemu_ld/qemu_st constraint */
ct->regs = 0xffffffff;
/* qemu_ld/qemu_st uses TCG_REG_TMP0 */
#if defined(CONFIG_SOFTMMU)
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[0]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[1]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[2]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[3]);
tcg_regset_reset_reg(ct->regs, tcg_target_call_iarg_regs[4]);
#endif
break;
case 'I':
ct->ct |= TCG_CT_CONST_S12;
break;
case 'N':
ct->ct |= TCG_CT_CONST_N12;
break;
case 'M':
ct->ct |= TCG_CT_CONST_M12;
break;
case 'Z':
/* we can use a zero immediate as a zero register argument. */
ct->ct |= TCG_CT_CONST_ZERO;
break;
default:
return NULL;
}
return ct_str;
}
/* test if a constant matches the constraint */
static int tcg_target_const_match(tcg_target_long val, TCGType type,
const TCGArgConstraint *arg_ct)

1
tcg/riscv/tcg-target.h
View file

@ -171,5 +171,6 @@ void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t);
#define TCG_TARGET_NEED_POOL_LABELS
#define TCG_TARGET_HAS_MEMORY_BSWAP 0
#define TCG_TARGET_CON_STR_H
#endif