/* * 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 . */ #include "qemu/osdep.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 + csr_register_map[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 + csr_register_map[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, 240, "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, 240, "riscv-64bit-csr.xml", 0); #endif }