diff options
Diffstat (limited to 'qemu/target-i386/gdbstub.c')
| -rw-r--r-- | qemu/target-i386/gdbstub.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/qemu/target-i386/gdbstub.c b/qemu/target-i386/gdbstub.c new file mode 100644 index 000000000..ff99cfb00 --- /dev/null +++ b/qemu/target-i386/gdbstub.c @@ -0,0 +1,233 @@ +/* + * x86 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" + +#ifdef TARGET_X86_64 +static const int gpr_map[16] = { + R_EAX, R_EBX, R_ECX, R_EDX, R_ESI, R_EDI, R_EBP, R_ESP, + 8, 9, 10, 11, 12, 13, 14, 15 +}; +#else +#define gpr_map gpr_map32 +#endif +static const int gpr_map32[8] = { 0, 1, 2, 3, 4, 5, 6, 7 }; + +#define IDX_IP_REG CPU_NB_REGS +#define IDX_FLAGS_REG (IDX_IP_REG + 1) +#define IDX_SEG_REGS (IDX_FLAGS_REG + 1) +#define IDX_FP_REGS (IDX_SEG_REGS + 6) +#define IDX_XMM_REGS (IDX_FP_REGS + 16) +#define IDX_MXCSR_REG (IDX_XMM_REGS + CPU_NB_REGS) + +int x86_cpu_gdb_read_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + X86CPU *cpu = X86_CPU(cs); + CPUX86State *env = &cpu->env; + + if (n < CPU_NB_REGS) { + if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) { + return gdb_get_reg64(mem_buf, env->regs[gpr_map[n]]); + } else if (n < CPU_NB_REGS32) { + return gdb_get_reg32(mem_buf, env->regs[gpr_map32[n]]); + } + } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) { +#ifdef USE_X86LDOUBLE + /* FIXME: byteswap float values - after fixing fpregs layout. */ + memcpy(mem_buf, &env->fpregs[n - IDX_FP_REGS], 10); +#else + memset(mem_buf, 0, 10); +#endif + return 10; + } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) { + n -= IDX_XMM_REGS; + if (n < CPU_NB_REGS32 || + (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK)) { + stq_p(mem_buf, env->xmm_regs[n].XMM_Q(0)); + stq_p(mem_buf + 8, env->xmm_regs[n].XMM_Q(1)); + return 16; + } + } else { + switch (n) { + case IDX_IP_REG: + if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) { + return gdb_get_reg64(mem_buf, env->eip); + } else { + return gdb_get_reg32(mem_buf, env->eip); + } + case IDX_FLAGS_REG: + return gdb_get_reg32(mem_buf, env->eflags); + + case IDX_SEG_REGS: + return gdb_get_reg32(mem_buf, env->segs[R_CS].selector); + case IDX_SEG_REGS + 1: + return gdb_get_reg32(mem_buf, env->segs[R_SS].selector); + case IDX_SEG_REGS + 2: + return gdb_get_reg32(mem_buf, env->segs[R_DS].selector); + case IDX_SEG_REGS + 3: + return gdb_get_reg32(mem_buf, env->segs[R_ES].selector); + case IDX_SEG_REGS + 4: + return gdb_get_reg32(mem_buf, env->segs[R_FS].selector); + case IDX_SEG_REGS + 5: + return gdb_get_reg32(mem_buf, env->segs[R_GS].selector); + + case IDX_FP_REGS + 8: + return gdb_get_reg32(mem_buf, env->fpuc); + case IDX_FP_REGS + 9: + return gdb_get_reg32(mem_buf, (env->fpus & ~0x3800) | + (env->fpstt & 0x7) << 11); + case IDX_FP_REGS + 10: + return gdb_get_reg32(mem_buf, 0); /* ftag */ + case IDX_FP_REGS + 11: + return gdb_get_reg32(mem_buf, 0); /* fiseg */ + case IDX_FP_REGS + 12: + return gdb_get_reg32(mem_buf, 0); /* fioff */ + case IDX_FP_REGS + 13: + return gdb_get_reg32(mem_buf, 0); /* foseg */ + case IDX_FP_REGS + 14: + return gdb_get_reg32(mem_buf, 0); /* fooff */ + case IDX_FP_REGS + 15: + return gdb_get_reg32(mem_buf, 0); /* fop */ + + case IDX_MXCSR_REG: + return gdb_get_reg32(mem_buf, env->mxcsr); + } + } + return 0; +} + +static int x86_cpu_gdb_load_seg(X86CPU *cpu, int sreg, uint8_t *mem_buf) +{ + CPUX86State *env = &cpu->env; + uint16_t selector = ldl_p(mem_buf); + + if (selector != env->segs[sreg].selector) { +#if defined(CONFIG_USER_ONLY) + cpu_x86_load_seg(env, sreg, selector); +#else + unsigned int limit, flags; + target_ulong base; + + if (!(env->cr[0] & CR0_PE_MASK) || (env->eflags & VM_MASK)) { + int dpl = (env->eflags & VM_MASK) ? 3 : 0; + base = selector << 4; + limit = 0xffff; + flags = DESC_P_MASK | DESC_S_MASK | DESC_W_MASK | + DESC_A_MASK | (dpl << DESC_DPL_SHIFT); + } else { + if (!cpu_x86_get_descr_debug(env, selector, &base, &limit, + &flags)) { + return 4; + } + } + cpu_x86_load_seg_cache(env, sreg, selector, base, limit, flags); +#endif + } + return 4; +} + +int x86_cpu_gdb_write_register(CPUState *cs, uint8_t *mem_buf, int n) +{ + X86CPU *cpu = X86_CPU(cs); + CPUX86State *env = &cpu->env; + uint32_t tmp; + + if (n < CPU_NB_REGS) { + if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) { + env->regs[gpr_map[n]] = ldtul_p(mem_buf); + return sizeof(target_ulong); + } else if (n < CPU_NB_REGS32) { + n = gpr_map32[n]; + env->regs[n] &= ~0xffffffffUL; + env->regs[n] |= (uint32_t)ldl_p(mem_buf); + return 4; + } + } else if (n >= IDX_FP_REGS && n < IDX_FP_REGS + 8) { +#ifdef USE_X86LDOUBLE + /* FIXME: byteswap float values - after fixing fpregs layout. */ + memcpy(&env->fpregs[n - IDX_FP_REGS], mem_buf, 10); +#endif + return 10; + } else if (n >= IDX_XMM_REGS && n < IDX_XMM_REGS + CPU_NB_REGS) { + n -= IDX_XMM_REGS; + if (n < CPU_NB_REGS32 || + (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK)) { + env->xmm_regs[n].XMM_Q(0) = ldq_p(mem_buf); + env->xmm_regs[n].XMM_Q(1) = ldq_p(mem_buf + 8); + return 16; + } + } else { + switch (n) { + case IDX_IP_REG: + if (TARGET_LONG_BITS == 64 && env->hflags & HF_CS64_MASK) { + env->eip = ldq_p(mem_buf); + return 8; + } else { + env->eip &= ~0xffffffffUL; + env->eip |= (uint32_t)ldl_p(mem_buf); + return 4; + } + case IDX_FLAGS_REG: + env->eflags = ldl_p(mem_buf); + return 4; + + case IDX_SEG_REGS: + return x86_cpu_gdb_load_seg(cpu, R_CS, mem_buf); + case IDX_SEG_REGS + 1: + return x86_cpu_gdb_load_seg(cpu, R_SS, mem_buf); + case IDX_SEG_REGS + 2: + return x86_cpu_gdb_load_seg(cpu, R_DS, mem_buf); + case IDX_SEG_REGS + 3: + return x86_cpu_gdb_load_seg(cpu, R_ES, mem_buf); + case IDX_SEG_REGS + 4: + return x86_cpu_gdb_load_seg(cpu, R_FS, mem_buf); + case IDX_SEG_REGS + 5: + return x86_cpu_gdb_load_seg(cpu, R_GS, mem_buf); + + case IDX_FP_REGS + 8: + cpu_set_fpuc(env, ldl_p(mem_buf)); + return 4; + case IDX_FP_REGS + 9: + tmp = ldl_p(mem_buf); + env->fpstt = (tmp >> 11) & 7; + env->fpus = tmp & ~0x3800; + return 4; + case IDX_FP_REGS + 10: /* ftag */ + return 4; + case IDX_FP_REGS + 11: /* fiseg */ + return 4; + case IDX_FP_REGS + 12: /* fioff */ + return 4; + case IDX_FP_REGS + 13: /* foseg */ + return 4; + case IDX_FP_REGS + 14: /* fooff */ + return 4; + case IDX_FP_REGS + 15: /* fop */ + return 4; + + case IDX_MXCSR_REG: + cpu_set_mxcsr(env, ldl_p(mem_buf)); + return 4; + } + } + /* Unrecognised register. */ + return 0; +} |