void gdb_send_stop_reason(uint8_t reason)
{
size_t rlen;
uint32_t s_rip;
uint64_t mode = (uint64_t)cpu_addr_sz();
if(mode == 64)
{
s_rip = 0x3a36313b;
rlen = sizeof(uint64_t)*2;
}
else /* XXX: gdb seems to wait for 32 bits regs at least */
{
s_rip = 0x3a38303b;
rlen = sizeof(uint32_t)*2;
}
gdb_add_str("T", 1);
gdb_add_byte(reason);
gdb_add_str("md:", 3);
gdb_add_number(mode, 2, 0);
gdb_add_str(";04:", 4);
gdb_add_number(info->vm.cpu.gpr->rsp.raw, rlen, 1);
gdb_add_str(";05:", 4);
gdb_add_number(info->vm.cpu.gpr->rbp.raw, rlen, 1);
gdb_add_str((char*)&s_rip, 4);
gdb_add_number(__rip.raw, rlen, 1);
gdb_add_str(";", 1);
gdb_send_packet();
}
static void gdb_vmm_get_fault(uint8_t __unused__ *data, size_t __unused__ len)
{
fault_ctx_t *fault = &info->vm.cpu.fault;
gdb_add_number(fault->excp.err, 8, 0);
gdb_add_number(fault->npf.err.raw, 16, 0);
gdb_add_number(fault->npf.vaddr, 16, 0);
gdb_add_number(fault->npf.paddr, 16, 0);
gdb_send_packet();
}
static void gdb_cmd_rd_gpr()
{
size_t flen, vlen, ngpr, i;
if(cpu_addr_sz() == 64)
{
ngpr = 16;
vlen = sizeof(uint64_t)*2;
}
else /* XXX: gdb seems to wait for 32 bits regs at least */
{
ngpr = 8;
vlen = sizeof(uint32_t)*2;
}
flen = sizeof(uint32_t)*2;
/* [r/e]ax - [r/e]di */
for(i=GPR64_RAX ; i >= ((GPR64_RAX+1)-ngpr) ; i--)
gdb_add_number(info->vm.cpu.gpr->raw[i].raw, vlen, 1);
/* [r/e]ip */
gdb_add_number(__rip.raw, vlen, 1);
/* fixed length eflags, cs, ss, ds, es, fs, gs */
gdb_add_number(__rflags.raw, flen, 1);
gdb_add_number(__cs.selector.raw, flen, 1);
__pre_access(__ss.selector); gdb_add_number(__ss.selector.raw, flen, 1);
__pre_access(__ds.selector); gdb_add_number(__ds.selector.raw, flen, 1);
__pre_access(__es.selector); gdb_add_number(__es.selector.raw, flen, 1);
__pre_access(__fs.selector); gdb_add_number(__fs.selector.raw, flen, 1);
__pre_access(__gs.selector); gdb_add_number(__gs.selector.raw, flen, 1);
gdb_send_packet();
}
static void gdb_vmm_translate(uint8_t *data, size_t len)
{
offset_t vaddr, paddr;
size_t psz, sz;
if(!gdb_get_number(data, len, (uint64_t*)&vaddr, 0))
{
gdb_nak();
return;
}
debug(GDBSTUB_CMD, "translating 0x%X\n", vaddr);
if(!__paging())
paddr = vaddr;
else if(!__pg_walk(info->vmm.ctrl.active_cr3, vaddr, &paddr, &psz, 1))
{
debug(GDBSTUB, "memory translation failure\n");
gdb_err_mem();
return;
}
debug(GDBSTUB_CMD, "sending 0x%X\n", paddr);
if(cpu_addr_sz() == 64)
sz = sizeof(uint64_t)*2;
else /* XXX: gdb seems to wait for 32 bits regs at least */
sz = sizeof(uint32_t)*2;
gdb_add_number(paddr, sz, 0);
gdb_send_packet();
}
static void gdb_vmm_rd_cr_wr_mask(uint8_t __unused__ *data, size_t __unused__ len)
{
raw64_t val;
size_t rlen;
rlen = sizeof(uint16_t)*2;
val.wlow = info->vmm.ctrl.usr.cr_wr;
gdb_add_number(val.raw, rlen, 0);
gdb_send_packet();
}
static void gdb_cmd_rd_reg(uint8_t *data, size_t len)
{
raw64_t *reg;
size_t size;
if(!__gdb_setup_reg_op(data, len, ®, &size, 0, 0, 0))
return;
size *= 2; /* to nibbles */
gdb_add_number(reg->raw, size, 1);
gdb_send_packet();
}
static void gdb_vmm_can_cli(uint8_t __unused__ *data, size_t __unused__ len)
{
bool_t can;
if(__interrupt_shadow || (__injecting_event() && __injected_event_type == 0))
can = 0;
else
can = 1;
gdb_add_number(can, sizeof(uint8_t)*2, 0);
gdb_send_packet();
}
static void gdb_vmm_rd_sysreg(uint8_t *data, size_t len)
{
raw64_t *reg;
size_t size;
if(!__gdb_setup_reg_op(data, len, ®, &size, 0, 0, 1))
{
debug(GDBSTUB_CMD, "read sysreg failed\n");
return;
}
size *= 2; /* to nibbles */
gdb_add_number(reg->raw, size, 1);
gdb_send_packet();
}
static void gdb_vmm_get_lbr(uint8_t __unused__ *data, size_t __unused__ len)
{
int i;
size_t rlen;
offset_t ips[4];
rlen = sizeof(uint64_t)*2;
__setup_lbr();
ips[0] = __lbr_from();
ips[1] = __lbr_to();
ips[2] = __lbr_from_excp();
ips[3] = __lbr_to_excp();
for(i=0 ; i<4 ; i++)
gdb_add_number(ips[i], rlen, 0);
gdb_send_packet();
}
/*
** Try to get a nested pte for the given addr
** Directly try to remap VM memory with finest
** granularity to return a nested pte
*/
static void gdb_vmm_npg_get_pte(uint8_t *data, size_t len)
{
loc_t addr;
npg_pte64_t *pte;
if(!gdb_get_number(data, len, (uint64_t*)&addr.raw, 0))
{
gdb_nak();
return;
}
pte = _npg_remap_finest_4K(addr.linear);
if(!pte)
{
debug(GDBSTUB_CMD, "no npg pte for 0x%x\n", addr.raw);
gdb_err_mem();
return;
}
npg_invlpg(addr.linear);
gdb_add_number(pte->raw, sizeof(uint64_t)*2, 0);
gdb_send_packet();
}
static void gdb_vmm_npg_translate(uint8_t *data, size_t len)
{
offset_t paddr, saddr;
if(!gdb_get_number(data, len, (uint64_t*)&paddr, 0))
{
gdb_nak();
return;
}
debug(GDBSTUB_CMD, "(nested) translating 0x%X\n", paddr);
if(!npg_walk(paddr, &saddr))
{
debug(GDBSTUB, "(nested) memory translation failure\n");
gdb_err_mem();
return;
}
debug(GDBSTUB_CMD, "sending 0x%X\n", saddr);
gdb_add_number(saddr, sizeof(uint64_t)*2, 0);
gdb_send_packet();
}
static void gdb_vmm_rdtsc(uint8_t __unused__ *data, size_t __unused__ len)
{
gdb_add_number(rdtsc(), sizeof(uint64_t)*2, 0);
gdb_send_packet();
}
static void gdb_vmm_get_idt_event(uint8_t __unused__ *data, size_t __unused__ len)
{
gdb_add_number(__injected_event(), sizeof(uint64_t)*2, 0);
gdb_send_packet();
}
static void gdb_vmm_rd_all_sysregs(uint8_t __unused__ *data, size_t __unused__ len)
{
size_t rlen = sizeof(uint64_t)*2;
gdb_add_number(__cr0.raw, rlen, 1);
__pre_access(__cr2); gdb_add_number(__cr2.raw, rlen, 1);
gdb_add_number(__cr3.raw, rlen, 1);
__pre_access(__cr4); gdb_add_number(__cr4.raw, rlen, 1);
gdb_add_number(get_dr0(), rlen, 1);
gdb_add_number(get_dr1(), rlen, 1);
gdb_add_number(get_dr2(), rlen, 1);
gdb_add_number(get_dr3(), rlen, 1);
__pre_access(__dr6); gdb_add_number(__dr6.raw, rlen, 1);
__pre_access(__dr7); gdb_add_number(__dr7.raw, rlen, 1);
__pre_access(__dbgctl); gdb_add_number(__dbgctl.raw, rlen, 1);
gdb_add_number(__efer.raw, rlen, 1);
gdb_add_number(__cs.base.raw, rlen, 1);
gdb_add_number(__ss.base.raw, rlen, 1);
__pre_access(__ds.base); gdb_add_number(__ds.base.raw, rlen, 1);
__pre_access(__es.base); gdb_add_number(__es.base.raw, rlen, 1);
__pre_access(__fs.base); gdb_add_number(__fs.base.raw, rlen, 1);
__pre_access(__gs.base); gdb_add_number(__gs.base.raw, rlen, 1);
__pre_access(__gdtr.base); gdb_add_number(__gdtr.base.raw, rlen, 1);
__pre_access(__idtr.base); gdb_add_number(__idtr.base.raw, rlen, 1);
__pre_access(__ldtr.base); gdb_add_number(__ldtr.base.raw, rlen, 1);
__pre_access(__tr.base); gdb_add_number(__tr.base.raw, rlen, 1);
gdb_send_packet();
}
