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qemu/target/riscv/gdbstub.c
Jonathan Behrens 81d2929c41
target/riscv: Make the priv register writable by GDB 
Currently only PRV_U, PRV_S and PRV_M are supported, so this patch ensures that
the privilege mode is set to one of them. Once support for the H-extension is
added, this code will also need to properly update the virtualization status
when switching between VU/VS-modes and M-mode.

Signed-off-by: Jonathan Behrens <jonathan@fintelia.io>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
2019-10-28 07:47:29 -07:00

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/*
* 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 "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;
}
static int riscv_gdb_get_virtual(CPURISCVState *cs, uint8_t *mem_buf, int n)
{
if (n == 0) {
#ifdef CONFIG_USER_ONLY
return gdb_get_regl(mem_buf, 0);
#else
return gdb_get_regl(mem_buf, cs->priv);
#endif
}
return 0;
}
static int riscv_gdb_set_virtual(CPURISCVState *cs, uint8_t *mem_buf, int n)
{
if (n == 0) {
#ifndef CONFIG_USER_ONLY
cs->priv = ldtul_p(mem_buf) & 0x3;
if (cs->priv == PRV_H) {
cs->priv = PRV_S;
}
#endif
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);
gdb_register_coprocessor(cs, riscv_gdb_get_virtual, riscv_gdb_set_virtual,
1, "riscv-32bit-virtual.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);
gdb_register_coprocessor(cs, riscv_gdb_get_virtual, riscv_gdb_set_virtual,
1, "riscv-64bit-virtual.xml", 0);
#endif
}
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