summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/vm86_32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/vm86_32.c')
-rw-r--r--arch/x86/kernel/vm86_32.c174
1 files changed, 89 insertions, 85 deletions
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 738c2104df3..6a91fcf92d6 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -64,7 +64,7 @@
#define KVM86 ((struct kernel_vm86_struct *)regs)
-#define VMPI KVM86->vm86plus
+#define VMPI KVM86->vm86plus
/*
@@ -81,7 +81,7 @@
#define VFLAGS (*(unsigned short *)&(current->thread.v86flags))
#define VEFLAGS (current->thread.v86flags)
-#define set_flags(X,new,mask) \
+#define set_flags(X, new, mask) \
((X) = ((X) & ~(mask)) | ((new) & (mask)))
#define SAFE_MASK (0xDD5)
@@ -93,8 +93,10 @@ static int copy_vm86_regs_to_user(struct vm86_regs __user *user,
{
int ret = 0;
- /* kernel_vm86_regs is missing gs, so copy everything up to
- (but not including) orig_eax, and then rest including orig_eax. */
+ /*
+ * kernel_vm86_regs is missing gs, so copy everything up to
+ * (but not including) orig_eax, and then rest including orig_eax.
+ */
ret += copy_to_user(user, regs, offsetof(struct kernel_vm86_regs, pt.orig_ax));
ret += copy_to_user(&user->orig_eax, &regs->pt.orig_ax,
sizeof(struct kernel_vm86_regs) -
@@ -120,7 +122,7 @@ static int copy_vm86_regs_from_user(struct kernel_vm86_regs *regs,
return ret;
}
-struct pt_regs * save_v86_state(struct kernel_vm86_regs * regs)
+struct pt_regs *save_v86_state(struct kernel_vm86_regs *regs)
{
struct tss_struct *tss;
struct pt_regs *ret;
@@ -138,8 +140,8 @@ struct pt_regs * save_v86_state(struct kernel_vm86_regs * regs)
do_exit(SIGSEGV);
}
set_flags(regs->pt.flags, VEFLAGS, VIF_MASK | current->thread.v86mask);
- tmp = copy_vm86_regs_to_user(&current->thread.vm86_info->regs,regs);
- tmp += put_user(current->thread.screen_bitmap,&current->thread.vm86_info->screen_bitmap);
+ tmp = copy_vm86_regs_to_user(&current->thread.vm86_info->regs, regs);
+ tmp += put_user(current->thread.screen_bitmap, &current->thread.vm86_info->screen_bitmap);
if (tmp) {
printk("vm86: could not access userspace vm86_info\n");
do_exit(SIGSEGV);
@@ -237,20 +239,21 @@ asmlinkage int sys_vm86(struct pt_regs regs)
tsk = current;
switch (regs.bx) {
- case VM86_REQUEST_IRQ:
- case VM86_FREE_IRQ:
- case VM86_GET_IRQ_BITS:
- case VM86_GET_AND_RESET_IRQ:
- ret = do_vm86_irq_handling(regs.bx, (int)regs.cx);
- goto out;
- case VM86_PLUS_INSTALL_CHECK:
- /* NOTE: on old vm86 stuff this will return the error
- from access_ok(), because the subfunction is
- interpreted as (invalid) address to vm86_struct.
- So the installation check works.
- */
- ret = 0;
- goto out;
+ case VM86_REQUEST_IRQ:
+ case VM86_FREE_IRQ:
+ case VM86_GET_IRQ_BITS:
+ case VM86_GET_AND_RESET_IRQ:
+ ret = do_vm86_irq_handling(regs.bx, (int)regs.cx);
+ goto out;
+ case VM86_PLUS_INSTALL_CHECK:
+ /*
+ * NOTE: on old vm86 stuff this will return the error
+ * from access_ok(), because the subfunction is
+ * interpreted as (invalid) address to vm86_struct.
+ * So the installation check works.
+ */
+ ret = 0;
+ goto out;
}
/* we come here only for functions VM86_ENTER, VM86_ENTER_NO_BYPASS */
@@ -299,18 +302,18 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
info->regs.pt.flags |= VM_MASK;
switch (info->cpu_type) {
- case CPU_286:
- tsk->thread.v86mask = 0;
- break;
- case CPU_386:
- tsk->thread.v86mask = NT_MASK | IOPL_MASK;
- break;
- case CPU_486:
- tsk->thread.v86mask = AC_MASK | NT_MASK | IOPL_MASK;
- break;
- default:
- tsk->thread.v86mask = ID_MASK | AC_MASK | NT_MASK | IOPL_MASK;
- break;
+ case CPU_286:
+ tsk->thread.v86mask = 0;
+ break;
+ case CPU_386:
+ tsk->thread.v86mask = NT_MASK | IOPL_MASK;
+ break;
+ case CPU_486:
+ tsk->thread.v86mask = AC_MASK | NT_MASK | IOPL_MASK;
+ break;
+ default:
+ tsk->thread.v86mask = ID_MASK | AC_MASK | NT_MASK | IOPL_MASK;
+ break;
}
/*
@@ -346,9 +349,9 @@ static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk
/* we never return here */
}
-static inline void return_to_32bit(struct kernel_vm86_regs * regs16, int retval)
+static inline void return_to_32bit(struct kernel_vm86_regs *regs16, int retval)
{
- struct pt_regs * regs32;
+ struct pt_regs *regs32;
regs32 = save_v86_state(regs16);
regs32->ax = retval;
@@ -358,29 +361,30 @@ static inline void return_to_32bit(struct kernel_vm86_regs * regs16, int retval)
: : "r" (regs32), "r" (current_thread_info()));
}
-static inline void set_IF(struct kernel_vm86_regs * regs)
+static inline void set_IF(struct kernel_vm86_regs *regs)
{
VEFLAGS |= VIF_MASK;
if (VEFLAGS & VIP_MASK)
return_to_32bit(regs, VM86_STI);
}
-static inline void clear_IF(struct kernel_vm86_regs * regs)
+static inline void clear_IF(struct kernel_vm86_regs *regs)
{
VEFLAGS &= ~VIF_MASK;
}
-static inline void clear_TF(struct kernel_vm86_regs * regs)
+static inline void clear_TF(struct kernel_vm86_regs *regs)
{
regs->pt.flags &= ~TF_MASK;
}
-static inline void clear_AC(struct kernel_vm86_regs * regs)
+static inline void clear_AC(struct kernel_vm86_regs *regs)
{
regs->pt.flags &= ~AC_MASK;
}
-/* It is correct to call set_IF(regs) from the set_vflags_*
+/*
+ * It is correct to call set_IF(regs) from the set_vflags_*
* functions. However someone forgot to call clear_IF(regs)
* in the opposite case.
* After the command sequence CLI PUSHF STI POPF you should
@@ -391,7 +395,7 @@ static inline void clear_AC(struct kernel_vm86_regs * regs)
* [KD]
*/
-static inline void set_vflags_long(unsigned long flags, struct kernel_vm86_regs * regs)
+static inline void set_vflags_long(unsigned long flags, struct kernel_vm86_regs *regs)
{
set_flags(VEFLAGS, flags, current->thread.v86mask);
set_flags(regs->pt.flags, flags, SAFE_MASK);
@@ -401,7 +405,7 @@ static inline void set_vflags_long(unsigned long flags, struct kernel_vm86_regs
clear_IF(regs);
}
-static inline void set_vflags_short(unsigned short flags, struct kernel_vm86_regs * regs)
+static inline void set_vflags_short(unsigned short flags, struct kernel_vm86_regs *regs)
{
set_flags(VFLAGS, flags, current->thread.v86mask);
set_flags(regs->pt.flags, flags, SAFE_MASK);
@@ -411,7 +415,7 @@ static inline void set_vflags_short(unsigned short flags, struct kernel_vm86_reg
clear_IF(regs);
}
-static inline unsigned long get_vflags(struct kernel_vm86_regs * regs)
+static inline unsigned long get_vflags(struct kernel_vm86_regs *regs)
{
unsigned long flags = regs->pt.flags & RETURN_MASK;
@@ -421,11 +425,11 @@ static inline unsigned long get_vflags(struct kernel_vm86_regs * regs)
return flags | (VEFLAGS & current->thread.v86mask);
}
-static inline int is_revectored(int nr, struct revectored_struct * bitmap)
+static inline int is_revectored(int nr, struct revectored_struct *bitmap)
{
__asm__ __volatile__("btl %2,%1\n\tsbbl %0,%0"
:"=r" (nr)
- :"m" (*bitmap),"r" (nr));
+ :"m" (*bitmap), "r" (nr));
return nr;
}
@@ -437,7 +441,7 @@ static inline int is_revectored(int nr, struct revectored_struct * bitmap)
ptr--; \
if (put_user(__val, base + ptr) < 0) \
goto err_label; \
- } while(0)
+ } while (0)
#define pushw(base, ptr, val, err_label) \
do { \
@@ -448,7 +452,7 @@ static inline int is_revectored(int nr, struct revectored_struct * bitmap)
ptr--; \
if (put_user(val_byte(__val, 0), base + ptr) < 0) \
goto err_label; \
- } while(0)
+ } while (0)
#define pushl(base, ptr, val, err_label) \
do { \
@@ -465,7 +469,7 @@ static inline int is_revectored(int nr, struct revectored_struct * bitmap)
ptr--; \
if (put_user(val_byte(__val, 0), base + ptr) < 0) \
goto err_label; \
- } while(0)
+ } while (0)
#define popb(base, ptr, err_label) \
({ \
@@ -512,7 +516,7 @@ static inline int is_revectored(int nr, struct revectored_struct * bitmap)
* in userspace is always better than an Oops anyway.) [KD]
*/
static void do_int(struct kernel_vm86_regs *regs, int i,
- unsigned char __user * ssp, unsigned short sp)
+ unsigned char __user *ssp, unsigned short sp)
{
unsigned long __user *intr_ptr;
unsigned long segoffs;
@@ -521,7 +525,7 @@ static void do_int(struct kernel_vm86_regs *regs, int i,
goto cannot_handle;
if (is_revectored(i, &KVM86->int_revectored))
goto cannot_handle;
- if (i==0x21 && is_revectored(AH(regs),&KVM86->int21_revectored))
+ if (i == 0x21 && is_revectored(AH(regs), &KVM86->int21_revectored))
goto cannot_handle;
intr_ptr = (unsigned long __user *) (i << 2);
if (get_user(segoffs, intr_ptr))
@@ -543,15 +547,15 @@ cannot_handle:
return_to_32bit(regs, VM86_INTx + (i << 8));
}
-int handle_vm86_trap(struct kernel_vm86_regs * regs, long error_code, int trapno)
+int handle_vm86_trap(struct kernel_vm86_regs *regs, long error_code, int trapno)
{
if (VMPI.is_vm86pus) {
- if ( (trapno==3) || (trapno==1) )
+ if ((trapno == 3) || (trapno == 1))
return_to_32bit(regs, VM86_TRAP + (trapno << 8));
do_int(regs, trapno, (unsigned char __user *) (regs->pt.ss << 4), SP(regs));
return 0;
}
- if (trapno !=1)
+ if (trapno != 1)
return 1; /* we let this handle by the calling routine */
if (current->ptrace & PT_PTRACED) {
unsigned long flags;
@@ -566,7 +570,7 @@ int handle_vm86_trap(struct kernel_vm86_regs * regs, long error_code, int trapno
return 0;
}
-void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
+void handle_vm86_fault(struct kernel_vm86_regs *regs, long error_code)
{
unsigned char opcode;
unsigned char __user *csp;
@@ -595,17 +599,17 @@ void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
pref_done = 0;
do {
switch (opcode = popb(csp, ip, simulate_sigsegv)) {
- case 0x66: /* 32-bit data */ data32=1; break;
- case 0x67: /* 32-bit address */ break;
- case 0x2e: /* CS */ break;
- case 0x3e: /* DS */ break;
- case 0x26: /* ES */ break;
- case 0x36: /* SS */ break;
- case 0x65: /* GS */ break;
- case 0x64: /* FS */ break;
- case 0xf2: /* repnz */ break;
- case 0xf3: /* rep */ break;
- default: pref_done = 1;
+ case 0x66: /* 32-bit data */ data32 = 1; break;
+ case 0x67: /* 32-bit address */ break;
+ case 0x2e: /* CS */ break;
+ case 0x3e: /* DS */ break;
+ case 0x26: /* ES */ break;
+ case 0x36: /* SS */ break;
+ case 0x65: /* GS */ break;
+ case 0x64: /* FS */ break;
+ case 0xf2: /* repnz */ break;
+ case 0xf3: /* rep */ break;
+ default: pref_done = 1;
}
} while (!pref_done);
@@ -628,7 +632,7 @@ void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
{
unsigned long newflags;
if (data32) {
- newflags=popl(ssp, sp, simulate_sigsegv);
+ newflags = popl(ssp, sp, simulate_sigsegv);
SP(regs) += 4;
} else {
newflags = popw(ssp, sp, simulate_sigsegv);
@@ -636,20 +640,20 @@ void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
}
IP(regs) = ip;
CHECK_IF_IN_TRAP;
- if (data32) {
+ if (data32)
set_vflags_long(newflags, regs);
- } else {
+ else
set_vflags_short(newflags, regs);
- }
+
VM86_FAULT_RETURN;
}
/* int xx */
case 0xcd: {
- int intno=popb(csp, ip, simulate_sigsegv);
+ int intno = popb(csp, ip, simulate_sigsegv);
IP(regs) = ip;
if (VMPI.vm86dbg_active) {
- if ( (1 << (intno &7)) & VMPI.vm86dbg_intxxtab[intno >> 3] )
+ if ((1 << (intno & 7)) & VMPI.vm86dbg_intxxtab[intno >> 3])
return_to_32bit(regs, VM86_INTx + (intno << 8));
}
do_int(regs, intno, ssp, sp);
@@ -663,9 +667,9 @@ void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
unsigned long newcs;
unsigned long newflags;
if (data32) {
- newip=popl(ssp, sp, simulate_sigsegv);
- newcs=popl(ssp, sp, simulate_sigsegv);
- newflags=popl(ssp, sp, simulate_sigsegv);
+ newip = popl(ssp, sp, simulate_sigsegv);
+ newcs = popl(ssp, sp, simulate_sigsegv);
+ newflags = popl(ssp, sp, simulate_sigsegv);
SP(regs) += 12;
} else {
newip = popw(ssp, sp, simulate_sigsegv);
@@ -734,18 +738,18 @@ static struct vm86_irqs {
static DEFINE_SPINLOCK(irqbits_lock);
static int irqbits;
-#define ALLOWED_SIGS ( 1 /* 0 = don't send a signal */ \
+#define ALLOWED_SIGS (1 /* 0 = don't send a signal */ \
| (1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGIO) | (1 << SIGURG) \
- | (1 << SIGUNUSED) )
-
+ | (1 << SIGUNUSED))
+
static irqreturn_t irq_handler(int intno, void *dev_id)
{
int irq_bit;
unsigned long flags;
- spin_lock_irqsave(&irqbits_lock, flags);
+ spin_lock_irqsave(&irqbits_lock, flags);
irq_bit = 1 << intno;
- if ((irqbits & irq_bit) || ! vm86_irqs[intno].tsk)
+ if ((irqbits & irq_bit) || !vm86_irqs[intno].tsk)
goto out;
irqbits |= irq_bit;
if (vm86_irqs[intno].sig)
@@ -759,7 +763,7 @@ static irqreturn_t irq_handler(int intno, void *dev_id)
return IRQ_HANDLED;
out:
- spin_unlock_irqrestore(&irqbits_lock, flags);
+ spin_unlock_irqrestore(&irqbits_lock, flags);
return IRQ_NONE;
}
@@ -770,9 +774,9 @@ static inline void free_vm86_irq(int irqnumber)
free_irq(irqnumber, NULL);
vm86_irqs[irqnumber].tsk = NULL;
- spin_lock_irqsave(&irqbits_lock, flags);
+ spin_lock_irqsave(&irqbits_lock, flags);
irqbits &= ~(1 << irqnumber);
- spin_unlock_irqrestore(&irqbits_lock, flags);
+ spin_unlock_irqrestore(&irqbits_lock, flags);
}
void release_vm86_irqs(struct task_struct *task)
@@ -788,10 +792,10 @@ static inline int get_and_reset_irq(int irqnumber)
int bit;
unsigned long flags;
int ret = 0;
-
+
if (invalid_vm86_irq(irqnumber)) return 0;
if (vm86_irqs[irqnumber].tsk != current) return 0;
- spin_lock_irqsave(&irqbits_lock, flags);
+ spin_lock_irqsave(&irqbits_lock, flags);
bit = irqbits & (1 << irqnumber);
irqbits &= ~bit;
if (bit) {
@@ -799,7 +803,7 @@ static inline int get_and_reset_irq(int irqnumber)
ret = 1;
}
- spin_unlock_irqrestore(&irqbits_lock, flags);
+ spin_unlock_irqrestore(&irqbits_lock, flags);
return ret;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-25 21:44:55 +0000