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[PATCH v6 3/4] target/riscv: Update [m|h]tinst CSR in riscv_cpu_do_inter
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From: |
Anup Patel |
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Subject: |
[PATCH v6 3/4] target/riscv: Update [m|h]tinst CSR in riscv_cpu_do_interrupt() |
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Date: |
Sat, 11 Jun 2022 13:31:06 +0530 |
We should write transformed instruction encoding of the trapped
instruction in [m|h]tinst CSR at time of taking trap as defined
by the RISC-V privileged specification v1.12.
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
target/riscv/cpu.h | 3 +
target/riscv/cpu_helper.c | 214 ++++++++++++++++++++++++++++++++++++--
target/riscv/instmap.h | 45 ++++++++
3 files changed, 256 insertions(+), 6 deletions(-)
diff --git a/target/riscv/cpu.h b/target/riscv/cpu.h
index 7d6397acdf..cac9e1876c 100644
--- a/target/riscv/cpu.h
+++ b/target/riscv/cpu.h
@@ -271,6 +271,9 @@ struct CPUArchState {
/* Signals whether the current exception occurred with two-stage address
translation active. */
bool two_stage_lookup;
+ /* Signals whether the current exception occurred while doing two-stage
+ address translation for the VS-stage page table walk. */
+ bool two_stage_indirect_lookup;
target_ulong scounteren;
target_ulong mcounteren;
diff --git a/target/riscv/cpu_helper.c b/target/riscv/cpu_helper.c
index 4a6700c890..3c8ebecf84 100644
--- a/target/riscv/cpu_helper.c
+++ b/target/riscv/cpu_helper.c
@@ -22,6 +22,7 @@
#include "qemu/main-loop.h"
#include "cpu.h"
#include "exec/exec-all.h"
+#include "instmap.h"
#include "tcg/tcg-op.h"
#include "trace.h"
#include "semihosting/common-semi.h"
@@ -1057,7 +1058,8 @@ restart:
static void raise_mmu_exception(CPURISCVState *env, target_ulong address,
MMUAccessType access_type, bool pmp_violation,
- bool first_stage, bool two_stage)
+ bool first_stage, bool two_stage,
+ bool two_stage_indirect)
{
CPUState *cs = env_cpu(env);
int page_fault_exceptions, vm;
@@ -1107,6 +1109,7 @@ static void raise_mmu_exception(CPURISCVState *env,
target_ulong address,
}
env->badaddr = address;
env->two_stage_lookup = two_stage;
+ env->two_stage_indirect_lookup = two_stage_indirect;
}
hwaddr riscv_cpu_get_phys_page_debug(CPUState *cs, vaddr addr)
@@ -1152,6 +1155,7 @@ void riscv_cpu_do_transaction_failed(CPUState *cs, hwaddr
physaddr,
env->badaddr = addr;
env->two_stage_lookup = riscv_cpu_virt_enabled(env) ||
riscv_cpu_two_stage_lookup(mmu_idx);
+ env->two_stage_indirect_lookup = false;
cpu_loop_exit_restore(cs, retaddr);
}
@@ -1177,6 +1181,7 @@ void riscv_cpu_do_unaligned_access(CPUState *cs, vaddr
addr,
env->badaddr = addr;
env->two_stage_lookup = riscv_cpu_virt_enabled(env) ||
riscv_cpu_two_stage_lookup(mmu_idx);
+ env->two_stage_indirect_lookup = false;
cpu_loop_exit_restore(cs, retaddr);
}
@@ -1192,6 +1197,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int
size,
bool pmp_violation = false;
bool first_stage_error = true;
bool two_stage_lookup = false;
+ bool two_stage_indirect_error = false;
int ret = TRANSLATE_FAIL;
int mode = mmu_idx;
/* default TLB page size */
@@ -1229,6 +1235,7 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address, int
size,
*/
if (ret == TRANSLATE_G_STAGE_FAIL) {
first_stage_error = false;
+ two_stage_indirect_error = true;
access_type = MMU_DATA_LOAD;
}
@@ -1312,12 +1319,182 @@ bool riscv_cpu_tlb_fill(CPUState *cs, vaddr address,
int size,
raise_mmu_exception(env, address, access_type, pmp_violation,
first_stage_error,
riscv_cpu_virt_enabled(env) ||
- riscv_cpu_two_stage_lookup(mmu_idx));
+ riscv_cpu_two_stage_lookup(mmu_idx),
+ two_stage_indirect_error);
cpu_loop_exit_restore(cs, retaddr);
}
return true;
}
+
+static target_ulong riscv_transformed_insn(CPURISCVState *env,
+ target_ulong insn,
+ bool addr_offset_nonzero,
+ target_ulong taddr)
+{
+ target_ulong xinsn = 0, xinsn_access_bits = 0;
+
+ /*
+ * Only Quadrant 0 and Quadrant 2 of RVC instruction space need to
+ * be uncompressed. The Quadrant 1 of RVC instruction space need
+ * not be transformed because these instructions won't generate
+ * any load/store trap.
+ */
+
+ if ((insn & 0x3) != 0x3) {
+ /* Transform 16bit instruction into 32bit instruction */
+ switch (GET_C_OP(insn)) {
+ case OPC_RISC_C_OP_QUAD0: /* Quadrant 0 */
+ switch (GET_C_FUNC(insn)) {
+ case OPC_RISC_C_FUNC_FLD_LQ:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FLD (RV32/64) */
+ xinsn = OPC_RISC_FLD;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_LW: /* C.LW */
+ xinsn = OPC_RISC_LW;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 2;
+ break;
+ case OPC_RISC_C_FUNC_FLW_LD:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FLW (RV32) */
+ xinsn = OPC_RISC_FLW;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 2;
+ } else { /* C.LD (RV64/RV128) */
+ xinsn = OPC_RISC_LD;
+ xinsn = SET_RD(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_FSD_SQ:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FSD (RV32/64) */
+ xinsn = OPC_RISC_FSD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_SW: /* C.SW */
+ xinsn = OPC_RISC_SW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 2;
+ break;
+ case OPC_RISC_C_FUNC_FSW_SD:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FSW (RV32) */
+ xinsn = OPC_RISC_FSW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 2;
+ } else { /* C.SD (RV64/RV128) */
+ xinsn = OPC_RISC_SD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2S(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ case OPC_RISC_C_OP_QUAD2: /* Quadrant 2 */
+ switch (GET_C_FUNC(insn)) {
+ case OPC_RISC_C_FUNC_FLDSP_LQSP:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FLDSP (RV32/64) */
+ xinsn = OPC_RISC_FLD;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_LWSP: /* C.LWSP */
+ xinsn = OPC_RISC_LW;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn_access_bits = 2;
+ break;
+ case OPC_RISC_C_FUNC_FLWSP_LDSP:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FLWSP (RV32) */
+ xinsn = OPC_RISC_FLW;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn_access_bits = 2;
+ } else { /* C.LDSP (RV64/RV128) */
+ xinsn = OPC_RISC_LD;
+ xinsn = SET_RD(xinsn, GET_C_RD(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_FSDSP_SQSP:
+ if (riscv_cpu_xlen(env) != 128) { /* C.FSDSP (RV32/64) */
+ xinsn = OPC_RISC_FSD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ case OPC_RISC_C_FUNC_SWSP: /* C.SWSP */
+ xinsn = OPC_RISC_SW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn_access_bits = 2;
+ break;
+ case 7:
+ if (riscv_cpu_xlen(env) == 32) { /* C.FSWSP (RV32) */
+ xinsn = OPC_RISC_FSW;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn_access_bits = 2;
+ } else { /* C.SDSP (RV64/RV128) */
+ xinsn = OPC_RISC_SD;
+ xinsn = SET_RS2(xinsn, GET_C_RS2(insn));
+ xinsn_access_bits = 3;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ /*
+ * Clear Bit1 of transformed instruction to indicate that
+ * original insruction was a 16bit instruction
+ */
+ xinsn &= ~((target_ulong)0x2);
+ } else {
+ /* Transform 32bit (or wider) instructions */
+ switch (MASK_OP_MAJOR(insn)) {
+ case OPC_RISC_ATOMIC:
+ xinsn = insn;
+ xinsn_access_bits = GET_FUNCT3(xinsn);
+ break;
+ case OPC_RISC_LOAD:
+ case OPC_RISC_FP_LOAD:
+ xinsn = insn;
+ xinsn_access_bits = GET_FUNCT3(xinsn);
+ xinsn = SET_I_IMM(xinsn, 0);
+ break;
+ case OPC_RISC_STORE:
+ case OPC_RISC_FP_STORE:
+ xinsn = insn;
+ xinsn_access_bits = GET_FUNCT3(xinsn);
+ xinsn = SET_S_IMM(xinsn, 0);
+ break;
+ case OPC_RISC_SYSTEM:
+ if (MASK_OP_SYSTEM(insn) == OPC_RISC_HLVHSV) {
+ xinsn = insn;
+ xinsn_access_bits = 1 << ((GET_FUNCT7(xinsn) >> 1) & 0x3);
+ }
+ break;
+ default:
+ break;
+ }
+ }
+
+ if (addr_offset_nonzero) {
+ xinsn = SET_RS1(xinsn, taddr & ((1 << xinsn_access_bits) - 1));
+ } else {
+ xinsn = SET_RS1(xinsn, 0);
+ }
+
+ return xinsn;
+}
#endif /* !CONFIG_USER_ONLY */
/*
@@ -1342,6 +1519,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
target_ulong cause = cs->exception_index & RISCV_EXCP_INT_MASK;
uint64_t deleg = async ? env->mideleg : env->medeleg;
target_ulong tval = 0;
+ target_ulong tinst = 0;
target_ulong htval = 0;
target_ulong mtval2 = 0;
@@ -1357,18 +1535,39 @@ void riscv_cpu_do_interrupt(CPUState *cs)
if (!async) {
/* set tval to badaddr for traps with address information */
switch (cause) {
- case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
case RISCV_EXCP_LOAD_GUEST_ACCESS_FAULT:
case RISCV_EXCP_STORE_GUEST_AMO_ACCESS_FAULT:
- case RISCV_EXCP_INST_ADDR_MIS:
- case RISCV_EXCP_INST_ACCESS_FAULT:
case RISCV_EXCP_LOAD_ADDR_MIS:
case RISCV_EXCP_STORE_AMO_ADDR_MIS:
case RISCV_EXCP_LOAD_ACCESS_FAULT:
case RISCV_EXCP_STORE_AMO_ACCESS_FAULT:
- case RISCV_EXCP_INST_PAGE_FAULT:
case RISCV_EXCP_LOAD_PAGE_FAULT:
case RISCV_EXCP_STORE_PAGE_FAULT:
+ write_gva = env->two_stage_lookup;
+ tval = env->badaddr;
+ if (env->two_stage_indirect_lookup) {
+ /*
+ * special pseudoinstruction for G-stage fault taken while
+ * doing VS-stage page table walk.
+ */
+ tinst = (riscv_cpu_xlen(env) == 32) ? 0x00002000 : 0x00003000;
+ } else {
+ /*
+ * The "Addr. Offset" field in transformed instruction is
+ * non-zero only for misaligned load/store traps.
+ */
+ if (cause == RISCV_EXCP_LOAD_ADDR_MIS ||
+ cause == RISCV_EXCP_STORE_AMO_ACCESS_FAULT) {
+ tinst = riscv_transformed_insn(env, env->bins, true, tval);
+ } else {
+ tinst = riscv_transformed_insn(env, env->bins, false,
tval);
+ }
+ }
+ break;
+ case RISCV_EXCP_INST_GUEST_PAGE_FAULT:
+ case RISCV_EXCP_INST_ADDR_MIS:
+ case RISCV_EXCP_INST_ACCESS_FAULT:
+ case RISCV_EXCP_INST_PAGE_FAULT:
write_gva = env->two_stage_lookup;
tval = env->badaddr;
break;
@@ -1450,6 +1649,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
env->sepc = env->pc;
env->stval = tval;
env->htval = htval;
+ env->htinst = tinst;
env->pc = (env->stvec >> 2 << 2) +
((async && (env->stvec & 3) == 1) ? cause * 4 : 0);
riscv_cpu_set_mode(env, PRV_S);
@@ -1480,6 +1680,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
env->mepc = env->pc;
env->mtval = tval;
env->mtval2 = mtval2;
+ env->mtinst = tinst;
env->pc = (env->mtvec >> 2 << 2) +
((async && (env->mtvec & 3) == 1) ? cause * 4 : 0);
riscv_cpu_set_mode(env, PRV_M);
@@ -1492,6 +1693,7 @@ void riscv_cpu_do_interrupt(CPUState *cs)
*/
env->two_stage_lookup = false;
+ env->two_stage_indirect_lookup = false;
#endif
cs->exception_index = RISCV_EXCP_NONE; /* mark handled to qemu */
}
diff --git a/target/riscv/instmap.h b/target/riscv/instmap.h
index 40b6d2b64d..f877530576 100644
--- a/target/riscv/instmap.h
+++ b/target/riscv/instmap.h
@@ -184,6 +184,8 @@ enum {
OPC_RISC_CSRRWI = OPC_RISC_SYSTEM | (0x5 << 12),
OPC_RISC_CSRRSI = OPC_RISC_SYSTEM | (0x6 << 12),
OPC_RISC_CSRRCI = OPC_RISC_SYSTEM | (0x7 << 12),
+
+ OPC_RISC_HLVHSV = OPC_RISC_SYSTEM | (0x4 << 12),
};
#define MASK_OP_FP_LOAD(op) (MASK_OP_MAJOR(op) | (op & (0x7 << 12)))
@@ -310,12 +312,20 @@ enum {
| (extract32(inst, 12, 8) << 12) \
| (sextract64(inst, 31, 1) << 20))
+#define GET_FUNCT3(inst) extract32(inst, 12, 3)
+#define GET_FUNCT7(inst) extract32(inst, 25, 7)
#define GET_RM(inst) extract32(inst, 12, 3)
#define GET_RS3(inst) extract32(inst, 27, 5)
#define GET_RS1(inst) extract32(inst, 15, 5)
#define GET_RS2(inst) extract32(inst, 20, 5)
#define GET_RD(inst) extract32(inst, 7, 5)
#define GET_IMM(inst) sextract64(inst, 20, 12)
+#define SET_RS1(inst, val) deposit32(inst, 15, 5, val)
+#define SET_RS2(inst, val) deposit32(inst, 20, 5, val)
+#define SET_RD(inst, val) deposit32(inst, 7, 5, val)
+#define SET_I_IMM(inst, val) deposit32(inst, 20, 12, val)
+#define SET_S_IMM(inst, val) \
+ deposit32(deposit32(inst, 7, 5, val), 25, 7, (val) >> 5)
/* RVC decoding macros */
#define GET_C_IMM(inst) (extract32(inst, 2, 5) \
@@ -346,6 +356,8 @@ enum {
| (extract32(inst, 5, 1) << 6))
#define GET_C_LD_IMM(inst) ((extract16(inst, 10, 3) << 3) \
| (extract16(inst, 5, 2) << 6))
+#define GET_C_SW_IMM(inst) GET_C_LW_IMM(inst)
+#define GET_C_SD_IMM(inst) GET_C_LD_IMM(inst)
#define GET_C_J_IMM(inst) ((extract32(inst, 3, 3) << 1) \
| (extract32(inst, 11, 1) << 4) \
| (extract32(inst, 2, 1) << 5) \
@@ -366,4 +378,37 @@ enum {
#define GET_C_RS1S(inst) (8 + extract16(inst, 7, 3))
#define GET_C_RS2S(inst) (8 + extract16(inst, 2, 3))
+#define GET_C_FUNC(inst) extract32(inst, 13, 3)
+#define GET_C_OP(inst) extract32(inst, 0, 2)
+
+enum {
+ /* RVC Quadrants */
+ OPC_RISC_C_OP_QUAD0 = 0x0,
+ OPC_RISC_C_OP_QUAD1 = 0x1,
+ OPC_RISC_C_OP_QUAD2 = 0x2
+};
+
+enum {
+ /* RVC Quadrant 0 */
+ OPC_RISC_C_FUNC_ADDI4SPN = 0x0,
+ OPC_RISC_C_FUNC_FLD_LQ = 0x1,
+ OPC_RISC_C_FUNC_LW = 0x2,
+ OPC_RISC_C_FUNC_FLW_LD = 0x3,
+ OPC_RISC_C_FUNC_FSD_SQ = 0x5,
+ OPC_RISC_C_FUNC_SW = 0x6,
+ OPC_RISC_C_FUNC_FSW_SD = 0x7
+};
+
+enum {
+ /* RVC Quadrant 2 */
+ OPC_RISC_C_FUNC_SLLI_SLLI64 = 0x0,
+ OPC_RISC_C_FUNC_FLDSP_LQSP = 0x1,
+ OPC_RISC_C_FUNC_LWSP = 0x2,
+ OPC_RISC_C_FUNC_FLWSP_LDSP = 0x3,
+ OPC_RISC_C_FUNC_JR_MV_EBREAK_JALR_ADD = 0x4,
+ OPC_RISC_C_FUNC_FSDSP_SQSP = 0x5,
+ OPC_RISC_C_FUNC_SWSP = 0x6,
+ OPC_RISC_C_FUNC_FSWSP_SDSP = 0x7
+};
+
#endif
--
2.34.1