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Detect illegal access to unmapped memory within real mode emulator to aid

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debugging.  Update copyright date while I am here.
This commit is contained in:
jkim 2010-03-18 20:15:34 +00:00
parent 128d886276
commit de04cb233d
1 changed files with 44 additions and 9 deletions
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53
sys/compat/x86bios/x86bios.c
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@ -1,6 +1,6 @@
/*- /*-
* Copyright (c) 2009 Alex Keda <admin@lissyara.su> * Copyright (c) 2009 Alex Keda <admin@lissyara.su>
* Copyright (c) 2009 Jung-uk Kim <jkim@FreeBSD.org> * Copyright (c) 2009-2010 Jung-uk Kim <jkim@FreeBSD.org>
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@ -81,6 +81,10 @@ static vm_offset_t *x86bios_map;
static vm_paddr_t x86bios_seg_phys; static vm_paddr_t x86bios_seg_phys;
static int x86bios_fault;
static uint32_t x86bios_fault_addr;
static uint32_t x86bios_fault_inst;
SYSCTL_NODE(_debug, OID_AUTO, x86bios, CTLFLAG_RD, NULL, "x86bios debugging"); SYSCTL_NODE(_debug, OID_AUTO, x86bios, CTLFLAG_RD, NULL, "x86bios debugging");
static int x86bios_trace_call; static int x86bios_trace_call;
TUNABLE_INT("debug.x86bios.call", &x86bios_trace_call); TUNABLE_INT("debug.x86bios.call", &x86bios_trace_call);
@ -91,6 +95,15 @@ TUNABLE_INT("debug.x86bios.int", &x86bios_trace_int);
SYSCTL_INT(_debug_x86bios, OID_AUTO, int, CTLFLAG_RW, &x86bios_trace_int, 0, SYSCTL_INT(_debug_x86bios, OID_AUTO, int, CTLFLAG_RW, &x86bios_trace_int, 0,
"Trace software interrupt handlers"); "Trace software interrupt handlers");
static void
x86bios_set_fault(struct x86emu *emu, uint32_t addr)
{
x86bios_fault = 1;
x86bios_fault_addr = addr;
x86bios_fault_inst = (emu->x86.R_CS << 4) + emu->x86.R_IP;
}
static void * static void *
x86bios_get_pages(uint32_t offset, size_t size) x86bios_get_pages(uint32_t offset, size_t size)
{ {
@ -123,8 +136,10 @@ x86bios_emu_rdb(struct x86emu *emu, uint32_t addr)
uint8_t *va; uint8_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
return (*va); return (*va);
} }
@ -135,8 +150,10 @@ x86bios_emu_rdw(struct x86emu *emu, uint32_t addr)
uint16_t *va; uint16_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
return (le16toh(*va)); return (le16toh(*va));
} }
@ -147,8 +164,10 @@ x86bios_emu_rdl(struct x86emu *emu, uint32_t addr)
uint32_t *va; uint32_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
return (le32toh(*va)); return (le32toh(*va));
} }
@ -159,8 +178,10 @@ x86bios_emu_wrb(struct x86emu *emu, uint32_t addr, uint8_t val)
uint8_t *va; uint8_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
*va = val; *va = val;
} }
@ -171,8 +192,10 @@ x86bios_emu_wrw(struct x86emu *emu, uint32_t addr, uint16_t val)
uint16_t *va; uint16_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
*va = htole16(val); *va = htole16(val);
} }
@ -183,8 +206,10 @@ x86bios_emu_wrl(struct x86emu *emu, uint32_t addr, uint32_t val)
uint32_t *va; uint32_t *va;
va = x86bios_get_pages(addr, sizeof(*va)); va = x86bios_get_pages(addr, sizeof(*va));
if (va == NULL) if (va == NULL) {
x86bios_set_fault(emu, addr);
x86emu_halt_sys(emu); x86emu_halt_sys(emu);
}
*va = htole32(val); *va = htole32(val);
} }
@ -331,15 +356,20 @@ x86bios_call(struct x86regs *regs, uint16_t seg, uint16_t off)
mtx_lock_spin(&x86bios_lock); mtx_lock_spin(&x86bios_lock);
memcpy(&x86bios_emu.x86, regs, sizeof(*regs)); memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
x86bios_fault = 0;
x86emu_exec_call(&x86bios_emu, seg, off); x86emu_exec_call(&x86bios_emu, seg, off);
memcpy(regs, &x86bios_emu.x86, sizeof(*regs)); memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
mtx_unlock_spin(&x86bios_lock); mtx_unlock_spin(&x86bios_lock);
if (x86bios_trace_call) if (x86bios_trace_call) {
printf("Exiting 0x%05x (ax=0x%04x bx=0x%04x " printf("Exiting 0x%05x (ax=0x%04x bx=0x%04x "
"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n", "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
(seg << 4) + off, regs->R_AX, regs->R_BX, regs->R_CX, (seg << 4) + off, regs->R_AX, regs->R_BX, regs->R_CX,
regs->R_DX, regs->R_ES, regs->R_DI); regs->R_DX, regs->R_ES, regs->R_DI);
if (x86bios_fault)
printf("Page fault at 0x%05x from 0x%05x.\n",
x86bios_fault_addr, x86bios_fault_inst);
}
} }
uint32_t uint32_t
@ -370,15 +400,20 @@ x86bios_intr(struct x86regs *regs, int intno)
mtx_lock_spin(&x86bios_lock); mtx_lock_spin(&x86bios_lock);
memcpy(&x86bios_emu.x86, regs, sizeof(*regs)); memcpy(&x86bios_emu.x86, regs, sizeof(*regs));
x86bios_fault = 0;
x86emu_exec_intr(&x86bios_emu, intno); x86emu_exec_intr(&x86bios_emu, intno);
memcpy(regs, &x86bios_emu.x86, sizeof(*regs)); memcpy(regs, &x86bios_emu.x86, sizeof(*regs));
mtx_unlock_spin(&x86bios_lock); mtx_unlock_spin(&x86bios_lock);
if (x86bios_trace_int) if (x86bios_trace_int) {
printf("Exiting int 0x%x (ax=0x%04x bx=0x%04x " printf("Exiting int 0x%x (ax=0x%04x bx=0x%04x "
"cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n", "cx=0x%04x dx=0x%04x es=0x%04x di=0x%04x)\n",
intno, regs->R_AX, regs->R_BX, regs->R_CX, intno, regs->R_AX, regs->R_BX, regs->R_CX,
regs->R_DX, regs->R_ES, regs->R_DI); regs->R_DX, regs->R_ES, regs->R_DI);
if (x86bios_fault)
printf("Page fault at 0x%05x from 0x%05x.\n",
x86bios_fault_addr, x86bios_fault_inst);
}
} }
void * void *