| /* |
| * RISC-V GDB Server Stub |
| * |
| * Copyright (c) 2016-2017 Sagar Karandikar, sagark@eecs.berkeley.edu |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms and conditions of the GNU General Public License, |
| * version 2 or later, as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| */ |
| |
| #include "qemu/osdep.h" |
| #include "qemu-common.h" |
| #include "exec/gdbstub.h" |
| #include "cpu.h" |
| |
| /* |
| * The GDB CSR xml files list them in documentation order, not numerical order, |
| * and are missing entries for unnamed CSRs. So we need to map the gdb numbers |
| * to the hardware numbers. |
| */ |
| |
| static int csr_register_map[] = { |
| CSR_USTATUS, |
| CSR_UIE, |
| CSR_UTVEC, |
| CSR_USCRATCH, |
| CSR_UEPC, |
| CSR_UCAUSE, |
| CSR_UTVAL, |
| CSR_UIP, |
| CSR_FFLAGS, |
| CSR_FRM, |
| CSR_FCSR, |
| CSR_CYCLE, |
| CSR_TIME, |
| CSR_INSTRET, |
| CSR_HPMCOUNTER3, |
| CSR_HPMCOUNTER4, |
| CSR_HPMCOUNTER5, |
| CSR_HPMCOUNTER6, |
| CSR_HPMCOUNTER7, |
| CSR_HPMCOUNTER8, |
| CSR_HPMCOUNTER9, |
| CSR_HPMCOUNTER10, |
| CSR_HPMCOUNTER11, |
| CSR_HPMCOUNTER12, |
| CSR_HPMCOUNTER13, |
| CSR_HPMCOUNTER14, |
| CSR_HPMCOUNTER15, |
| CSR_HPMCOUNTER16, |
| CSR_HPMCOUNTER17, |
| CSR_HPMCOUNTER18, |
| CSR_HPMCOUNTER19, |
| CSR_HPMCOUNTER20, |
| CSR_HPMCOUNTER21, |
| CSR_HPMCOUNTER22, |
| CSR_HPMCOUNTER23, |
| CSR_HPMCOUNTER24, |
| CSR_HPMCOUNTER25, |
| CSR_HPMCOUNTER26, |
| CSR_HPMCOUNTER27, |
| CSR_HPMCOUNTER28, |
| CSR_HPMCOUNTER29, |
| CSR_HPMCOUNTER30, |
| CSR_HPMCOUNTER31, |
| CSR_CYCLEH, |
| CSR_TIMEH, |
| CSR_INSTRETH, |
| CSR_HPMCOUNTER3H, |
| CSR_HPMCOUNTER4H, |
| CSR_HPMCOUNTER5H, |
| CSR_HPMCOUNTER6H, |
| CSR_HPMCOUNTER7H, |
| CSR_HPMCOUNTER8H, |
| CSR_HPMCOUNTER9H, |
| CSR_HPMCOUNTER10H, |
| CSR_HPMCOUNTER11H, |
| CSR_HPMCOUNTER12H, |
| CSR_HPMCOUNTER13H, |
| CSR_HPMCOUNTER14H, |
| CSR_HPMCOUNTER15H, |
| CSR_HPMCOUNTER16H, |
| CSR_HPMCOUNTER17H, |
| CSR_HPMCOUNTER18H, |
| CSR_HPMCOUNTER19H, |
| CSR_HPMCOUNTER20H, |
| CSR_HPMCOUNTER21H, |
| CSR_HPMCOUNTER22H, |
| CSR_HPMCOUNTER23H, |
| CSR_HPMCOUNTER24H, |
| CSR_HPMCOUNTER25H, |
| CSR_HPMCOUNTER26H, |
| CSR_HPMCOUNTER27H, |
| CSR_HPMCOUNTER28H, |
| CSR_HPMCOUNTER29H, |
| CSR_HPMCOUNTER30H, |
| CSR_HPMCOUNTER31H, |
| CSR_SSTATUS, |
| CSR_SEDELEG, |
| CSR_SIDELEG, |
| CSR_SIE, |
| CSR_STVEC, |
| CSR_SCOUNTEREN, |
| CSR_SSCRATCH, |
| CSR_SEPC, |
| CSR_SCAUSE, |
| CSR_STVAL, |
| CSR_SIP, |
| CSR_SATP, |
| CSR_MVENDORID, |
| CSR_MARCHID, |
| CSR_MIMPID, |
| CSR_MHARTID, |
| CSR_MSTATUS, |
| CSR_MISA, |
| CSR_MEDELEG, |
| CSR_MIDELEG, |
| CSR_MIE, |
| CSR_MTVEC, |
| CSR_MCOUNTEREN, |
| CSR_MSCRATCH, |
| CSR_MEPC, |
| CSR_MCAUSE, |
| CSR_MTVAL, |
| CSR_MIP, |
| CSR_PMPCFG0, |
| CSR_PMPCFG1, |
| CSR_PMPCFG2, |
| CSR_PMPCFG3, |
| CSR_PMPADDR0, |
| CSR_PMPADDR1, |
| CSR_PMPADDR2, |
| CSR_PMPADDR3, |
| CSR_PMPADDR4, |
| CSR_PMPADDR5, |
| CSR_PMPADDR6, |
| CSR_PMPADDR7, |
| CSR_PMPADDR8, |
| CSR_PMPADDR9, |
| CSR_PMPADDR10, |
| CSR_PMPADDR11, |
| CSR_PMPADDR12, |
| CSR_PMPADDR13, |
| CSR_PMPADDR14, |
| CSR_PMPADDR15, |
| CSR_MCYCLE, |
| CSR_MINSTRET, |
| CSR_MHPMCOUNTER3, |
| CSR_MHPMCOUNTER4, |
| CSR_MHPMCOUNTER5, |
| CSR_MHPMCOUNTER6, |
| CSR_MHPMCOUNTER7, |
| CSR_MHPMCOUNTER8, |
| CSR_MHPMCOUNTER9, |
| CSR_MHPMCOUNTER10, |
| CSR_MHPMCOUNTER11, |
| CSR_MHPMCOUNTER12, |
| CSR_MHPMCOUNTER13, |
| CSR_MHPMCOUNTER14, |
| CSR_MHPMCOUNTER15, |
| CSR_MHPMCOUNTER16, |
| CSR_MHPMCOUNTER17, |
| CSR_MHPMCOUNTER18, |
| CSR_MHPMCOUNTER19, |
| CSR_MHPMCOUNTER20, |
| CSR_MHPMCOUNTER21, |
| CSR_MHPMCOUNTER22, |
| CSR_MHPMCOUNTER23, |
| CSR_MHPMCOUNTER24, |
| CSR_MHPMCOUNTER25, |
| CSR_MHPMCOUNTER26, |
| CSR_MHPMCOUNTER27, |
| CSR_MHPMCOUNTER28, |
| CSR_MHPMCOUNTER29, |
| CSR_MHPMCOUNTER30, |
| CSR_MHPMCOUNTER31, |
| CSR_MCYCLEH, |
| CSR_MINSTRETH, |
| CSR_MHPMCOUNTER3H, |
| CSR_MHPMCOUNTER4H, |
| CSR_MHPMCOUNTER5H, |
| CSR_MHPMCOUNTER6H, |
| CSR_MHPMCOUNTER7H, |
| CSR_MHPMCOUNTER8H, |
| CSR_MHPMCOUNTER9H, |
| CSR_MHPMCOUNTER10H, |
| CSR_MHPMCOUNTER11H, |
| CSR_MHPMCOUNTER12H, |
| CSR_MHPMCOUNTER13H, |
| CSR_MHPMCOUNTER14H, |
| CSR_MHPMCOUNTER15H, |
| CSR_MHPMCOUNTER16H, |
| CSR_MHPMCOUNTER17H, |
| CSR_MHPMCOUNTER18H, |
| CSR_MHPMCOUNTER19H, |
| CSR_MHPMCOUNTER20H, |
| CSR_MHPMCOUNTER21H, |
| CSR_MHPMCOUNTER22H, |
| CSR_MHPMCOUNTER23H, |
| CSR_MHPMCOUNTER24H, |
| CSR_MHPMCOUNTER25H, |
| CSR_MHPMCOUNTER26H, |
| CSR_MHPMCOUNTER27H, |
| CSR_MHPMCOUNTER28H, |
| CSR_MHPMCOUNTER29H, |
| CSR_MHPMCOUNTER30H, |
| CSR_MHPMCOUNTER31H, |
| CSR_MHPMEVENT3, |
| CSR_MHPMEVENT4, |
| CSR_MHPMEVENT5, |
| CSR_MHPMEVENT6, |
| CSR_MHPMEVENT7, |
| CSR_MHPMEVENT8, |
| CSR_MHPMEVENT9, |
| CSR_MHPMEVENT10, |
| CSR_MHPMEVENT11, |
| CSR_MHPMEVENT12, |
| CSR_MHPMEVENT13, |
| CSR_MHPMEVENT14, |
| CSR_MHPMEVENT15, |
| CSR_MHPMEVENT16, |
| CSR_MHPMEVENT17, |
| CSR_MHPMEVENT18, |
| CSR_MHPMEVENT19, |
| CSR_MHPMEVENT20, |
| CSR_MHPMEVENT21, |
| CSR_MHPMEVENT22, |
| CSR_MHPMEVENT23, |
| CSR_MHPMEVENT24, |
| CSR_MHPMEVENT25, |
| CSR_MHPMEVENT26, |
| CSR_MHPMEVENT27, |
| CSR_MHPMEVENT28, |
| CSR_MHPMEVENT29, |
| CSR_MHPMEVENT30, |
| CSR_MHPMEVENT31, |
| CSR_TSELECT, |
| CSR_TDATA1, |
| CSR_TDATA2, |
| CSR_TDATA3, |
| CSR_DCSR, |
| CSR_DPC, |
| CSR_DSCRATCH, |
| CSR_HSTATUS, |
| CSR_HEDELEG, |
| CSR_HIDELEG, |
| CSR_HIE, |
| CSR_HTVEC, |
| CSR_HSCRATCH, |
| CSR_HEPC, |
| CSR_HCAUSE, |
| CSR_HBADADDR, |
| CSR_HIP, |
| CSR_MBASE, |
| CSR_MBOUND, |
| CSR_MIBASE, |
| CSR_MIBOUND, |
| CSR_MDBASE, |
| CSR_MDBOUND, |
| CSR_MUCOUNTEREN, |
| CSR_MSCOUNTEREN, |
| CSR_MHCOUNTEREN, |
| }; |
| |
| int riscv_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) |
| { |
| RISCVCPU *cpu = RISCV_CPU(cs); |
| CPURISCVState *env = &cpu->env; |
| |
| if (n < 32) { |
| return gdb_get_regl(mem_buf, env->gpr[n]); |
| } else if (n == 32) { |
| return gdb_get_regl(mem_buf, env->pc); |
| } |
| return 0; |
| } |
| |
| int riscv_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) |
| { |
| RISCVCPU *cpu = RISCV_CPU(cs); |
| CPURISCVState *env = &cpu->env; |
| |
| if (n == 0) { |
| /* discard writes to x0 */ |
| return sizeof(target_ulong); |
| } else if (n < 32) { |
| env->gpr[n] = ldtul_p(mem_buf); |
| return sizeof(target_ulong); |
| } else if (n == 32) { |
| env->pc = ldtul_p(mem_buf); |
| return sizeof(target_ulong); |
| } |
| return 0; |
| } |
| |
| static int riscv_gdb_get_fpu(CPURISCVState *env, uint8_t *mem_buf, int n) |
| { |
| if (n < 32) { |
| return gdb_get_reg64(mem_buf, env->fpr[n]); |
| /* there is hole between ft11 and fflags in fpu.xml */ |
| } else if (n < 36 && n > 32) { |
| target_ulong val = 0; |
| int result; |
| /* |
| * CSR_FFLAGS is at index 8 in csr_register, and gdb says it is FP |
| * register 33, so we recalculate the map index. |
| * This also works for CSR_FRM and CSR_FCSR. |
| */ |
| result = riscv_csrrw_debug(env, n - 33 + 8, &val, 0, 0); |
| if (result == 0) { |
| return gdb_get_regl(mem_buf, val); |
| } |
| } |
| return 0; |
| } |
| |
| static int riscv_gdb_set_fpu(CPURISCVState *env, uint8_t *mem_buf, int n) |
| { |
| if (n < 32) { |
| env->fpr[n] = ldq_p(mem_buf); /* always 64-bit */ |
| return sizeof(uint64_t); |
| /* there is hole between ft11 and fflags in fpu.xml */ |
| } else if (n < 36 && n > 32) { |
| target_ulong val = ldtul_p(mem_buf); |
| int result; |
| /* |
| * CSR_FFLAGS is at index 8 in csr_register, and gdb says it is FP |
| * register 33, so we recalculate the map index. |
| * This also works for CSR_FRM and CSR_FCSR. |
| */ |
| result = riscv_csrrw_debug(env, n - 33 + 8, NULL, val, -1); |
| if (result == 0) { |
| return sizeof(target_ulong); |
| } |
| } |
| return 0; |
| } |
| |
| static int riscv_gdb_get_csr(CPURISCVState *env, uint8_t *mem_buf, int n) |
| { |
| if (n < ARRAY_SIZE(csr_register_map)) { |
| target_ulong val = 0; |
| int result; |
| |
| result = riscv_csrrw_debug(env, csr_register_map[n], &val, 0, 0); |
| if (result == 0) { |
| return gdb_get_regl(mem_buf, val); |
| } |
| } |
| return 0; |
| } |
| |
| static int riscv_gdb_set_csr(CPURISCVState *env, uint8_t *mem_buf, int n) |
| { |
| if (n < ARRAY_SIZE(csr_register_map)) { |
| target_ulong val = ldtul_p(mem_buf); |
| int result; |
| |
| result = riscv_csrrw_debug(env, csr_register_map[n], NULL, val, -1); |
| if (result == 0) { |
| return sizeof(target_ulong); |
| } |
| } |
| return 0; |
| } |
| |
| void riscv_cpu_register_gdb_regs_for_features(CPUState *cs) |
| { |
| RISCVCPU *cpu = RISCV_CPU(cs); |
| CPURISCVState *env = &cpu->env; |
| #if defined(TARGET_RISCV32) |
| if (env->misa & RVF) { |
| gdb_register_coprocessor(cs, riscv_gdb_get_fpu, riscv_gdb_set_fpu, |
| 36, "riscv-32bit-fpu.xml", 0); |
| } |
| |
| gdb_register_coprocessor(cs, riscv_gdb_get_csr, riscv_gdb_set_csr, |
| 4096, "riscv-32bit-csr.xml", 0); |
| #elif defined(TARGET_RISCV64) |
| if (env->misa & RVF) { |
| gdb_register_coprocessor(cs, riscv_gdb_get_fpu, riscv_gdb_set_fpu, |
| 36, "riscv-64bit-fpu.xml", 0); |
| } |
| |
| gdb_register_coprocessor(cs, riscv_gdb_get_csr, riscv_gdb_set_csr, |
| 4096, "riscv-64bit-csr.xml", 0); |
| #endif |
| } |
