motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-03 15:53:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

Supervisor mode implementation, by Aurelien Jarno.

Browse source 
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3267 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
ths 2007-09-29 19:21:36 +00:00
parent 544540979c
commit 671880e651
3 changed files with 46 additions and 34 deletions
Download patch file Download diff file Expand all files Collapse all files

61
target-mips/helper.c
View file

@ -106,6 +106,8 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
{
/* User mode can only access useg/xuseg */
int user_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_UM;
int supervisor_mode = (env->hflags & MIPS_HFLAG_MODE) == MIPS_HFLAG_SM;
int kernel_mode = !user_mode && !supervisor_mode;
#ifdef TARGET_MIPS64
int UX = (env->CP0_Status & (1 << CP0St_UX)) != 0;
int SX = (env->CP0_Status & (1 << CP0St_SX)) != 0;
@ -120,14 +122,6 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
}
#endif
#ifdef TARGET_MIPS64
if (user_mode && address > 0x3FFFFFFFFFFFFFFFULL)
return TLBRET_BADADDR;
#else
if (user_mode && address > 0x7FFFFFFFUL)
return TLBRET_BADADDR;
#endif
if (address <= (int32_t)0x7FFFFFFFUL) {
/* useg */
if (env->CP0_Status & (1 << CP0St_ERL)) {
@ -150,16 +144,16 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
}
} else if (address < 0x7FFFFFFFFFFFFFFFULL) {
/* xsseg */
if (SX && address < (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
if ((supervisor_mode || kernel_mode) &&
SX && address < (0x7FFFFFFFFFFFFFFFULL & env->SEGMask)) {
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
} else if (address < 0xBFFFFFFFFFFFFFFFULL) {
/* xkphys */
/* XXX: check supervisor mode */
if (KX && (address & 0x07FFFFFFFFFFFFFFULL) < 0X0000000FFFFFFFFFULL)
{
if (kernel_mode && KX &&
(address & 0x07FFFFFFFFFFFFFFULL) < 0X0000000FFFFFFFFFULL) {
*physical = address & 0X0000000FFFFFFFFFULL;
*prot = PAGE_READ | PAGE_WRITE;
} else {
@ -167,8 +161,8 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
}
} else if (address < 0xFFFFFFFF7FFFFFFFULL) {
/* xkseg */
/* XXX: check supervisor mode */
if (KX && address < (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
if (kernel_mode && KX &&
address < (0xFFFFFFFF7FFFFFFFULL & env->SEGMask)) {
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
@ -176,22 +170,35 @@ static int get_physical_address (CPUState *env, target_ulong *physical,
#endif
} else if (address < (int32_t)0xA0000000UL) {
/* kseg0 */
/* XXX: check supervisor mode */
*physical = address - (int32_t)0x80000000UL;
*prot = PAGE_READ | PAGE_WRITE;
if (kernel_mode) {
*physical = address - (int32_t)0x80000000UL;
*prot = PAGE_READ | PAGE_WRITE;
} else {
ret = TLBRET_BADADDR;
}
} else if (address < (int32_t)0xC0000000UL) {
/* kseg1 */
/* XXX: check supervisor mode */
*physical = address - (int32_t)0xA0000000UL;
*prot = PAGE_READ | PAGE_WRITE;
if (kernel_mode) {
*physical = address - (int32_t)0xA0000000UL;
*prot = PAGE_READ | PAGE_WRITE;
} else {
ret = TLBRET_BADADDR;
}
} else if (address < (int32_t)0xE0000000UL) {
/* kseg2 */
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
/* sseg */
if (supervisor_mode || kernel_mode) {
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
} else {
/* kseg3 */
/* XXX: check supervisor mode */
/* XXX: debug segment is not emulated */
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
if (kernel_mode) {
ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);
} else {
ret = TLBRET_BADADDR;
}
}
#if 0
if (logfile) {
@ -369,7 +376,7 @@ void do_interrupt (CPUState *env)
}
enter_debug_mode:
env->hflags |= MIPS_HFLAG_DM | MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
env->hflags &= ~MIPS_HFLAG_UM;
env->hflags &= ~(MIPS_HFLAG_SM | MIPS_HFLAG_UM);
/* EJTAG probe trap enable is not implemented... */
if (!(env->CP0_Status & (1 << CP0St_EXL)))
env->CP0_Cause &= ~(1 << CP0Ca_BD);
@ -395,7 +402,7 @@ void do_interrupt (CPUState *env)
}
env->CP0_Status |= (1 << CP0St_ERL) | (1 << CP0St_BEV);
env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
env->hflags &= ~MIPS_HFLAG_UM;
env->hflags &= ~(MIPS_HFLAG_SM | MIPS_HFLAG_UM);
if (!(env->CP0_Status & (1 << CP0St_EXL)))
env->CP0_Cause &= ~(1 << CP0Ca_BD);
env->PC[env->current_tc] = (int32_t)0xBFC00000;
@ -497,7 +504,7 @@ void do_interrupt (CPUState *env)
}
env->CP0_Status |= (1 << CP0St_EXL);
env->hflags |= MIPS_HFLAG_64 | MIPS_HFLAG_CP0;
env->hflags &= ~MIPS_HFLAG_UM;
env->hflags &= ~(MIPS_HFLAG_SM | MIPS_HFLAG_UM);
}
env->hflags &= ~MIPS_HFLAG_BMASK;
if (env->CP0_Status & (1 << CP0St_BEV)) {