| /* |
| * 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)) { |
| base = selector << 4; |
| limit = 0xffff; |
| flags = 0; |
| } 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: |
| env->fpuc = 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: |
| env->mxcsr = ldl_p(mem_buf); |
| return 4; |
| } |
| } |
| /* Unrecognised register. */ |
| return 0; |
| } |
