diff options
Diffstat (limited to 'target-i386')
| -rw-r--r-- | target-i386/kvm.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/target-i386/kvm.c b/target-i386/kvm.c index 86745b1350..5168a02ca7 100644 --- a/target-i386/kvm.c +++ b/target-i386/kvm.c @@ -22,6 +22,7 @@ #include "sysemu.h" #include "kvm.h" #include "cpu.h" +#include "gdbstub.h" //#define DEBUG_KVM @@ -683,3 +684,193 @@ int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run) return ret; } + +#ifdef KVM_CAP_SET_GUEST_DEBUG +static int kvm_patch_opcode_byte(CPUState *env, target_ulong addr, uint8_t val) +{ + target_phys_addr_t phys_page_addr; + unsigned long pd; + uint8_t *ptr; + + phys_page_addr = cpu_get_phys_page_debug(env, addr & TARGET_PAGE_MASK); + if (phys_page_addr == -1) + return -EINVAL; + + pd = cpu_get_physical_page_desc(phys_page_addr); + if ((pd & ~TARGET_PAGE_MASK) != IO_MEM_RAM && + (pd & ~TARGET_PAGE_MASK) != IO_MEM_ROM && !(pd & IO_MEM_ROMD)) + return -EINVAL; + + ptr = phys_ram_base + (pd & TARGET_PAGE_MASK) + + (addr & ~TARGET_PAGE_MASK); + *ptr = val; + return 0; +} + +int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp) +{ + if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) || + kvm_patch_opcode_byte(env, bp->pc, 0xcc)) + return -EINVAL; + return 0; +} + +int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp) +{ + uint8_t int3; + + if (cpu_memory_rw_debug(env, bp->pc, &int3, 1, 0) || int3 != 0xcc || + kvm_patch_opcode_byte(env, bp->pc, bp->saved_insn)) + return -EINVAL; + return 0; +} + +static struct { + target_ulong addr; + int len; + int type; +} hw_breakpoint[4]; + +static int nb_hw_breakpoint; + +static int find_hw_breakpoint(target_ulong addr, int len, int type) +{ + int n; + + for (n = 0; n < nb_hw_breakpoint; n++) + if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type && + (hw_breakpoint[n].len == len || len == -1)) + return n; + return -1; +} + +int kvm_arch_insert_hw_breakpoint(target_ulong addr, + target_ulong len, int type) +{ + switch (type) { + case GDB_BREAKPOINT_HW: + len = 1; + break; + case GDB_WATCHPOINT_WRITE: + case GDB_WATCHPOINT_ACCESS: + switch (len) { + case 1: + break; + case 2: + case 4: + case 8: + if (addr & (len - 1)) + return -EINVAL; + break; + default: + return -EINVAL; + } + break; + default: + return -ENOSYS; + } + + if (nb_hw_breakpoint == 4) + return -ENOBUFS; + + if (find_hw_breakpoint(addr, len, type) >= 0) + return -EEXIST; + + hw_breakpoint[nb_hw_breakpoint].addr = addr; + hw_breakpoint[nb_hw_breakpoint].len = len; + hw_breakpoint[nb_hw_breakpoint].type = type; + nb_hw_breakpoint++; + + return 0; +} + +int kvm_arch_remove_hw_breakpoint(target_ulong addr, + target_ulong len, int type) +{ + int n; + + n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type); + if (n < 0) + return -ENOENT; + + nb_hw_breakpoint--; + hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint]; + + return 0; +} + +void kvm_arch_remove_all_hw_breakpoints(void) +{ + nb_hw_breakpoint = 0; +} + +static CPUWatchpoint hw_watchpoint; + +int kvm_arch_debug(struct kvm_debug_exit_arch *arch_info) +{ + int handle = 0; + int n; + + if (arch_info->exception == 1) { + if (arch_info->dr6 & (1 << 14)) { + if (cpu_single_env->singlestep_enabled) + handle = 1; + } else { + for (n = 0; n < 4; n++) + if (arch_info->dr6 & (1 << n)) + switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) { + case 0x0: + handle = 1; + break; + case 0x1: + handle = 1; + cpu_single_env->watchpoint_hit = &hw_watchpoint; + hw_watchpoint.vaddr = hw_breakpoint[n].addr; + hw_watchpoint.flags = BP_MEM_WRITE; + break; + case 0x3: + handle = 1; + cpu_single_env->watchpoint_hit = &hw_watchpoint; + hw_watchpoint.vaddr = hw_breakpoint[n].addr; + hw_watchpoint.flags = BP_MEM_ACCESS; + break; + } + } + } else if (kvm_find_sw_breakpoint(cpu_single_env, arch_info->pc)) + handle = 1; + + if (!handle) + kvm_update_guest_debug(cpu_single_env, + (arch_info->exception == 1) ? + KVM_GUESTDBG_INJECT_DB : KVM_GUESTDBG_INJECT_BP); + + return handle; +} + +void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg) +{ + const uint8_t type_code[] = { + [GDB_BREAKPOINT_HW] = 0x0, + [GDB_WATCHPOINT_WRITE] = 0x1, + [GDB_WATCHPOINT_ACCESS] = 0x3 + }; + const uint8_t len_code[] = { + [1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2 + }; + int n; + + if (kvm_sw_breakpoints_active(env)) + dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP; + + if (nb_hw_breakpoint > 0) { + dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP; + dbg->arch.debugreg[7] = 0x0600; + for (n = 0; n < nb_hw_breakpoint; n++) { + dbg->arch.debugreg[n] = hw_breakpoint[n].addr; + dbg->arch.debugreg[7] |= (2 << (n * 2)) | + (type_code[hw_breakpoint[n].type] << (16 + n*4)) | + (len_code[hw_breakpoint[n].len] << (18 + n*4)); + } + } +} +#endif /* KVM_CAP_SET_GUEST_DEBUG */ |