diff options
Diffstat (limited to 'target-mips/gdbstub.c')
| -rw-r--r-- | target-mips/gdbstub.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/target-mips/gdbstub.c b/target-mips/gdbstub.c new file mode 100644 index 0000000000..5b72d58a44 --- /dev/null +++ b/target-mips/gdbstub.c @@ -0,0 +1,155 @@ +/* + * MIPS gdb server stub + * + * Copyright (c) 2003-2005 Fabrice Bellard + * Copyright (c) 2013 SUSE LINUX Products GmbH + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ +#include "config.h" +#include "qemu-common.h" +#include "exec/gdbstub.h" + +int mips_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + MIPSCPU *cpu = MIPS_CPU(cs); + CPUMIPSState *env = &cpu->env; + + if (n < 32) { + return gdb_get_regl(mem_buf, env->active_tc.gpr[n]); + } + if (env->CP0_Config1 & (1 << CP0C1_FP)) { + if (n >= 38 && n < 70) { + if (env->CP0_Status & (1 << CP0St_FR)) { + return gdb_get_regl(mem_buf, + env->active_fpu.fpr[n - 38].d); + } else { + return gdb_get_regl(mem_buf, + env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX]); + } + } + switch (n) { + case 70: + return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr31); + case 71: + return gdb_get_regl(mem_buf, (int32_t)env->active_fpu.fcr0); + } + } + switch (n) { + case 32: + return gdb_get_regl(mem_buf, (int32_t)env->CP0_Status); + case 33: + return gdb_get_regl(mem_buf, env->active_tc.LO[0]); + case 34: + return gdb_get_regl(mem_buf, env->active_tc.HI[0]); + case 35: + return gdb_get_regl(mem_buf, env->CP0_BadVAddr); + case 36: + return gdb_get_regl(mem_buf, (int32_t)env->CP0_Cause); + case 37: + return gdb_get_regl(mem_buf, env->active_tc.PC | + !!(env->hflags & MIPS_HFLAG_M16)); + case 72: + return gdb_get_regl(mem_buf, 0); /* fp */ + case 89: + return gdb_get_regl(mem_buf, (int32_t)env->CP0_PRid); + } + if (n >= 73 && n <= 88) { + /* 16 embedded regs. */ + return gdb_get_regl(mem_buf, 0); + } + + return 0; +} + +/* convert MIPS rounding mode in FCR31 to IEEE library */ +static unsigned int ieee_rm[] = { + float_round_nearest_even, + float_round_to_zero, + float_round_up, + float_round_down +}; +#define RESTORE_ROUNDING_MODE \ + set_float_rounding_mode(ieee_rm[env->active_fpu.fcr31 & 3], \ + &env->active_fpu.fp_status) + +int mips_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + MIPSCPU *cpu = MIPS_CPU(cs); + CPUMIPSState *env = &cpu->env; + target_ulong tmp; + + tmp = ldtul_p(mem_buf); + + if (n < 32) { + env->active_tc.gpr[n] = tmp; + return sizeof(target_ulong); + } + if (env->CP0_Config1 & (1 << CP0C1_FP) + && n >= 38 && n < 73) { + if (n < 70) { + if (env->CP0_Status & (1 << CP0St_FR)) { + env->active_fpu.fpr[n - 38].d = tmp; + } else { + env->active_fpu.fpr[n - 38].w[FP_ENDIAN_IDX] = tmp; + } + } + switch (n) { + case 70: + env->active_fpu.fcr31 = tmp & 0xFF83FFFF; + /* set rounding mode */ + RESTORE_ROUNDING_MODE; + break; + case 71: + env->active_fpu.fcr0 = tmp; + break; + } + return sizeof(target_ulong); + } + switch (n) { + case 32: + env->CP0_Status = tmp; + break; + case 33: + env->active_tc.LO[0] = tmp; + break; + case 34: + env->active_tc.HI[0] = tmp; + break; + case 35: + env->CP0_BadVAddr = tmp; + break; + case 36: + env->CP0_Cause = tmp; + break; + case 37: + env->active_tc.PC = tmp & ~(target_ulong)1; + if (tmp & 1) { + env->hflags |= MIPS_HFLAG_M16; + } else { + env->hflags &= ~(MIPS_HFLAG_M16); + } + break; + case 72: /* fp, ignored */ + break; + default: + if (n > 89) { + return 0; + } + /* Other registers are readonly. Ignore writes. */ + break; + } + + return sizeof(target_ulong); +} |