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X-Received-From: 68.232.141.245 Subject: [Qemu-devel] [RFC v2 08/24] riscv: tcg-target: Add the immediate encoders X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "alistair23@gmail.com" , "richard.henderson@linaro.org" , Alistair Francis Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Alistair Francis Signed-off-by: Michael Clark Reviewed-by: Richard Henderson --- tcg/riscv/tcg-target.inc.c | 105 +++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) diff --git a/tcg/riscv/tcg-target.inc.c b/tcg/riscv/tcg-target.inc.c index 5719af3c08..c659c4de39 100644 --- a/tcg/riscv/tcg-target.inc.c +++ b/tcg/riscv/tcg-target.inc.c @@ -252,3 +252,108 @@ typedef enum { OPC_FENCE_R_RW = 0x0230000f, OPC_FENCE_RW_W = 0x0310000f, } RISCVInsn; + +/* + * RISC-V immediate and instruction encoders (excludes 16-bit RVC) + */ + +/* Type-R */ + +static int32_t encode_r(RISCVInsn opc, TCGReg rd, TCGReg rs1, TCGReg rs2) +{ + return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20; +} + +/* Type-I */ + +static int32_t encode_imm12(uint32_t imm) +{ + return (imm & 0xfff) << 20; +} + +static int32_t encode_i(RISCVInsn opc, TCGReg rd, TCGReg rs1, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | (rs1 & 0x1f) << 15 | encode_imm12(imm); +} + +/* Type-S */ + +static int32_t encode_simm12(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0xFE0) << 20; + ret |= (imm & 0x1F) << 7; + + return ret; +} + +static int32_t encode_s(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm) +{ + return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_simm12(imm); +} + +/* Type-SB */ + +static int32_t encode_sbimm12(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0x1000) << 19; + ret |= (imm & 0x7e0) << 20; + ret |= (imm & 0x1e) << 7; + ret |= (imm & 0x800) >> 4; + + return ret; +} + +static int32_t encode_sb(RISCVInsn opc, TCGReg rs1, TCGReg rs2, uint32_t imm) +{ + return opc | (rs1 & 0x1f) << 15 | (rs2 & 0x1f) << 20 | encode_sbimm12(imm); +} + +/* Type-U */ + +static int32_t encode_uimm20(uint32_t imm) +{ + return imm & 0xfffff000; +} + +static int32_t encode_u(RISCVInsn opc, TCGReg rd, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | encode_uimm20(imm); +} + +/* Type-UJ */ + +static int32_t encode_ujimm12(uint32_t imm) +{ + int32_t ret = 0; + + ret |= (imm & 0x100000) << 11; + ret |= (imm & 0xffe) << 20; + ret |= (imm & 0x800) << 9; + ret |= imm & 0xff000; + + return ret; +} + +static int32_t encode_uj(RISCVInsn opc, TCGReg rd, uint32_t imm) +{ + return opc | (rd & 0x1f) << 7 | encode_ujimm12(imm); +} + +void tb_target_set_jmp_target(uintptr_t tc_ptr, uintptr_t jmp_addr, + uintptr_t addr) +{ + intptr_t offset = (intptr_t)addr - (intptr_t)jmp_addr; + tcg_debug_assert(offset == (int32_t)offset); + + int32_t hi20 = ((offset + 0x800) >> 12) << 12; + int32_t lo12 = offset - hi20; + + atomic_set((uint32_t *)jmp_addr, encode_uimm20(hi20)); + atomic_set((uint32_t *)jmp_addr + 4, encode_imm12(lo12)); + + flush_icache_range(jmp_addr, jmp_addr + 8); +}