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qemu-e2k/tcg/mips/tcg-target.h
Richard Henderson 23a79c113e tcg/mips: Support unaligned access for user-only 
This is kinda sorta the opposite of the other tcg hosts, where
we get (normal) alignment checks for free with host SIGBUS and
need to add code to support unaligned accesses.

Fortunately, the ISA contains pairs of instructions that are
used to implement unaligned memory accesses.  Use them.

Tested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
2022-02-09 08:55:02 +11:00

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/*
* Tiny Code Generator for QEMU
*
* Copyright (c) 2008-2009 Arnaud Patard <arnaud.patard@rtp-net.org>
* Copyright (c) 2009 Aurelien Jarno <aurelien@aurel32.net>
* Based on i386/tcg-target.c - Copyright (c) 2008 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef MIPS_TCG_TARGET_H
#define MIPS_TCG_TARGET_H
#if _MIPS_SIM == _ABIO32
# define TCG_TARGET_REG_BITS 32
#elif _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
# define TCG_TARGET_REG_BITS 64
#else
# error "Unknown ABI"
#endif
#define TCG_TARGET_INSN_UNIT_SIZE 4
#define TCG_TARGET_TLB_DISPLACEMENT_BITS 16
#define TCG_TARGET_NB_REGS 32
#define MAX_CODE_GEN_BUFFER_SIZE ((size_t)-1)
typedef enum {
TCG_REG_ZERO = 0,
TCG_REG_AT,
TCG_REG_V0,
TCG_REG_V1,
TCG_REG_A0,
TCG_REG_A1,
TCG_REG_A2,
TCG_REG_A3,
TCG_REG_T0,
TCG_REG_T1,
TCG_REG_T2,
TCG_REG_T3,
TCG_REG_T4,
TCG_REG_T5,
TCG_REG_T6,
TCG_REG_T7,
TCG_REG_S0,
TCG_REG_S1,
TCG_REG_S2,
TCG_REG_S3,
TCG_REG_S4,
TCG_REG_S5,
TCG_REG_S6,
TCG_REG_S7,
TCG_REG_T8,
TCG_REG_T9,
TCG_REG_K0,
TCG_REG_K1,
TCG_REG_GP,
TCG_REG_SP,
TCG_REG_S8,
TCG_REG_RA,
TCG_REG_CALL_STACK = TCG_REG_SP,
TCG_AREG0 = TCG_REG_S0,
} TCGReg;
/* used for function call generation */
#define TCG_TARGET_STACK_ALIGN 16
#if _MIPS_SIM == _ABIO32
# define TCG_TARGET_CALL_STACK_OFFSET 16
#else
# define TCG_TARGET_CALL_STACK_OFFSET 0
#endif
#define TCG_TARGET_CALL_ALIGN_ARGS 1
/* MOVN/MOVZ instructions detection */
#if (defined(__mips_isa_rev) && (__mips_isa_rev >= 1)) || \
defined(_MIPS_ARCH_LOONGSON2E) || defined(_MIPS_ARCH_LOONGSON2F) || \
defined(_MIPS_ARCH_MIPS4)
#define use_movnz_instructions 1
#else
extern bool use_movnz_instructions;
#endif
/* MIPS32 instruction set detection */
#if defined(__mips_isa_rev) && (__mips_isa_rev >= 1)
#define use_mips32_instructions 1
#else
extern bool use_mips32_instructions;
#endif
/* MIPS32R2 instruction set detection */
#if defined(__mips_isa_rev) && (__mips_isa_rev >= 2)
#define use_mips32r2_instructions 1
#else
extern bool use_mips32r2_instructions;
#endif
/* MIPS32R6 instruction set detection */
#if defined(__mips_isa_rev) && (__mips_isa_rev >= 6)
#define use_mips32r6_instructions 1
#else
#define use_mips32r6_instructions 0
#endif
/* optional instructions */
#define TCG_TARGET_HAS_div_i32 1
#define TCG_TARGET_HAS_rem_i32 1
#define TCG_TARGET_HAS_not_i32 1
#define TCG_TARGET_HAS_nor_i32 1
#define TCG_TARGET_HAS_andc_i32 0
#define TCG_TARGET_HAS_orc_i32 0
#define TCG_TARGET_HAS_eqv_i32 0
#define TCG_TARGET_HAS_nand_i32 0
#define TCG_TARGET_HAS_mulu2_i32 (!use_mips32r6_instructions)
#define TCG_TARGET_HAS_muls2_i32 (!use_mips32r6_instructions)
#define TCG_TARGET_HAS_muluh_i32 1
#define TCG_TARGET_HAS_mulsh_i32 1
#define TCG_TARGET_HAS_bswap32_i32 1
#define TCG_TARGET_HAS_direct_jump 0
#if TCG_TARGET_REG_BITS == 64
#define TCG_TARGET_HAS_add2_i32 0
#define TCG_TARGET_HAS_sub2_i32 0
#define TCG_TARGET_HAS_extrl_i64_i32 1
#define TCG_TARGET_HAS_extrh_i64_i32 1
#define TCG_TARGET_HAS_div_i64 1
#define TCG_TARGET_HAS_rem_i64 1
#define TCG_TARGET_HAS_not_i64 1
#define TCG_TARGET_HAS_nor_i64 1
#define TCG_TARGET_HAS_andc_i64 0
#define TCG_TARGET_HAS_orc_i64 0
#define TCG_TARGET_HAS_eqv_i64 0
#define TCG_TARGET_HAS_nand_i64 0
#define TCG_TARGET_HAS_add2_i64 0
#define TCG_TARGET_HAS_sub2_i64 0
#define TCG_TARGET_HAS_mulu2_i64 (!use_mips32r6_instructions)
#define TCG_TARGET_HAS_muls2_i64 (!use_mips32r6_instructions)
#define TCG_TARGET_HAS_muluh_i64 1
#define TCG_TARGET_HAS_mulsh_i64 1
#define TCG_TARGET_HAS_ext32s_i64 1
#define TCG_TARGET_HAS_ext32u_i64 1
#endif
/* optional instructions detected at runtime */
#define TCG_TARGET_HAS_movcond_i32 use_movnz_instructions
#define TCG_TARGET_HAS_bswap16_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_deposit_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_extract_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_sextract_i32 0
#define TCG_TARGET_HAS_extract2_i32 0
#define TCG_TARGET_HAS_ext8s_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_ext16s_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_rot_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_clz_i32 use_mips32r2_instructions
#define TCG_TARGET_HAS_ctz_i32 0
#define TCG_TARGET_HAS_ctpop_i32 0
#define TCG_TARGET_HAS_qemu_st8_i32 0
#if TCG_TARGET_REG_BITS == 64
#define TCG_TARGET_HAS_movcond_i64 use_movnz_instructions
#define TCG_TARGET_HAS_bswap16_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_bswap32_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_bswap64_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_deposit_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_extract_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_sextract_i64 0
#define TCG_TARGET_HAS_extract2_i64 0
#define TCG_TARGET_HAS_ext8s_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_ext16s_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_rot_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_clz_i64 use_mips32r2_instructions
#define TCG_TARGET_HAS_ctz_i64 0
#define TCG_TARGET_HAS_ctpop_i64 0
#endif
/* optional instructions automatically implemented */
#define TCG_TARGET_HAS_neg_i32 0 /* sub rd, zero, rt */
#define TCG_TARGET_HAS_ext8u_i32 0 /* andi rt, rs, 0xff */
#define TCG_TARGET_HAS_ext16u_i32 0 /* andi rt, rs, 0xffff */
#if TCG_TARGET_REG_BITS == 64
#define TCG_TARGET_HAS_neg_i64 0 /* sub rd, zero, rt */
#define TCG_TARGET_HAS_ext8u_i64 0 /* andi rt, rs, 0xff */
#define TCG_TARGET_HAS_ext16u_i64 0 /* andi rt, rs, 0xffff */
#endif
#define TCG_TARGET_DEFAULT_MO (0)
#define TCG_TARGET_HAS_MEMORY_BSWAP 1
/* not defined -- call should be eliminated at compile time */
void tb_target_set_jmp_target(uintptr_t, uintptr_t, uintptr_t, uintptr_t)
QEMU_ERROR("code path is reachable");
#define TCG_TARGET_NEED_LDST_LABELS
#endif
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