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arch/risc-v/riscv_misaligned: Implement float load/store support

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Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
This commit is contained in:
Huang Qi 2022-04-21 17:51:23 +08:00 committed by Xiang Xiao
parent 2f32c8dcf2
commit 06c7a3ca59
1 changed files with 103 additions and 6 deletions
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109
arch/risc-v/src/common/riscv_misaligned.c
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@ -329,17 +329,92 @@ static bool decode_insn_compressed(uintptr_t *regs, riscv_insn_ctx_t *ctx)
ctx->len = 4;
break;
# ifdef CONFIG_ARCH_RV32
# ifdef CONFIG_ARCH_FPU
# ifdef CONFIG_ARCH_RV32
case INSN_C_FLW:
/* flw share the same encoding layout with lw */
imm = insn.lw.imm2 << 2 | insn.lw.imm53 << 3 | insn.lw.imm6 << 6;
ctx->dest = (uint8_t *)&regs[REG_F8 + insn.lw.rd];
ctx->src = (uint8_t *)regs[REG_X8 + insn.lw.rs1] + imm;
ctx->len = 4;
break;
case INSN_C_FLWSP:
/* flwsp share the same encoding layout with lwsp */
imm = insn.lwsp.imm42 << 2 | insn.lwsp.imm5 << 5 |
insn.lwsp.imm76 << 6;
ctx->dest = (uint8_t *)&regs[REG_F0 + insn.lwsp.rd];
ctx->src = (uint8_t *)regs[REG_SP] + imm;
ctx->len = 4;
break;
case INSN_C_FSW:
/* fsw share the same encoding layout with sw */
imm = insn.sw.imm2 << 2 | insn.sw.imm53 << 3 | insn.sw.imm6 << 6;
ctx->dest = (uint8_t *)regs[REG_X8 + insn.sw.rs1] + imm;
ctx->src = (uint8_t *)&regs[REG_F8 + insn.sd.rs2];
ctx->len = 4;
break;
case INSN_C_FSWSP:
# endif
/* fswsp share the same encoding layout with swsp */
imm = insn.swsp.imm52 << 2 | insn.swsp.imm76 << 6;
ctx->dest = (uint8_t *)regs[REG_SP] + imm;
ctx->src = (uint8_t *)&regs[REG_F0 + insn.swsp.rs2];
ctx->len = 4;
break;
# endif
case INSN_C_FLD:
/* fld share the same encoding layout with ld */
imm = insn.ld.imm53 << 3 | insn.ld.imm76 << 6;
ctx->dest = (uint8_t *)&regs[REG_F8 + insn.ld.rd];
ctx->src = (uint8_t *)regs[REG_X8 + insn.ld.rs1] + imm;
ctx->len = 8;
break;
case INSN_C_FLDSP:
/* fldsp share the same encoding layout with ldsp */
imm = insn.ldsp.imm43 << 3 | insn.ldsp.imm5 << 5 |
insn.ldsp.imm86 << 6;
ctx->dest = (uint8_t *)&regs[REG_F0 + insn.ld.rd];
ctx->src = (uint8_t *)regs[REG_SP] + imm;
ctx->len = 8;
break;
case INSN_C_FSD:
/* fsd share the same encoding layout with sd */
imm = insn.sd.imm53 << 3 | insn.sd.imm76 << 6;
ctx->dest = (uint8_t *)regs[REG_X8 + insn.sd.rs1] + imm;
ctx->src = (uint8_t *)&regs[REG_F8 + insn.sd.rs2];
ctx->len = 8;
break;
case INSN_C_FSDSP:
_alert("Misaligned compressed float instruction not support yet\n");
/* fsdsp share the same encoding layout with sdsp */
imm = insn.sdsp.imm53 << 3 | insn.sdsp.imm86 << 6;
ctx->dest = (uint8_t *)regs[REG_SP] + imm;
ctx->src = (uint8_t *)&regs[REG_F0 + insn.sdsp.rs2];
ctx->len = 8;
break;
# endif
default:
_alert("Compressed: %x\n", insn.insn);
return false;
@ -439,13 +514,35 @@ static bool decode_insn(uintptr_t *regs, riscv_insn_ctx_t *ctx)
break;
/* TODO: Handle float load / store instruction */
#ifdef CONFIG_ARCH_FPU
case INSN_FLW:
case INSN_FLD:
ctx->dest = (uint8_t *)&regs[REG_F0 + insn.l.rd];
ctx->src = (uint8_t *)regs[insn.l.rs1] +
sext(insn.l.imm, 12);
/* Is instruction flw or fld ? */
ctx->len = insn.l.funct3 == 0x2 ? 4 : 8;
break;
case INSN_FSW:
case INSN_FSD:
_alert("Misaligned float instruction not support yet\n");
/* Fetch signed imm */
imm = sext(insn.s.imm2 | insn.s.imm1 << 5, 12);
ctx->dest = (uint8_t *)regs[insn.s.rs1] + imm;
ctx->src = (uint8_t *)&regs[REG_F0 + insn.s.rs2];
/* Is instruction fsw or fsd ? */
ctx->len = insn.s.funct3 == 0x2 ? 4 : 8;
break;
#endif
default:
_alert("Uncompressed: %x\n", insn.insn);
return false;