* [patch] vm86: Code cleanup
@ 2002-07-28 16:37 Stas Sergeev
0 siblings, 0 replies; only message in thread
From: Stas Sergeev @ 2002-07-28 16:37 UTC (permalink / raw)
To: linux-kernel
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Hello.
This patch substitutes the
asmish hell in the stack
manipulating macros by the
get_user() and put_user() macros.
No functional changes.
The patch is for the latest
-ac kernels.
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--- linux/arch/i386/kernel/vm86.c Sat May 11 01:39:45 2002
+++ linux/arch/i386/kernel/vm86.c Sat Jun 15 17:51:22 2002
@@ -365,183 +365,80 @@
return nr;
}
-/*
- * Boy are these ugly, but we need to do the correct 16-bit arithmetic.
- * Gcc makes a mess of it, so we do it inline and use non-obvious calling
- * conventions..
- * FIXME: is VM86_UNKNOWN really the correct return code? [MS??]
- * No that wasn't correct, instead we jump to a label given as
- * argument. In do_int the label already existed, in handle_vm86_fault
- * it had to be created. Can this be optimized so error handling get
- * out of the default execution path by using the address of the
- * label as fixup address? [KD]
- */
+#define val_byte(val, n) (((__u8 *)&val)[n])
+
#define pushb(base, ptr, val, err_label) \
do { \
- int err; \
- __asm__ __volatile__( \
- "decw %w0\n\t" \
- "1: movb %3,0(%2,%0)\n\t" \
- "xor %1,%1\n\t" \
- "2:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "3: movl $1,%1\n\t" \
- " jmp 2b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,3b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (err) \
- : "r" (base), "q" (val), "0" (ptr)); \
- if (err) \
+ __u8 __val = val; \
+ ptr--; \
+ if (put_user(__val, base + ptr) < 0) \
goto err_label; \
} while(0)
#define pushw(base, ptr, val, err_label) \
do { \
- int err; \
- __asm__ __volatile__( \
- "decw %w0\n\t" \
- "1: movb %h3,0(%2,%0)\n\t" \
- "decw %w0\n\t" \
- "2: movb %b3,0(%2,%0)\n\t" \
- "xor %1,%1\n\t" \
- "3:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "4: movl $1,%1\n\t" \
- " jmp 3b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (err) \
- : "r" (base), "q" (val), "0" (ptr)); \
- if (err) \
+ __u16 __val = val; \
+ ptr--; \
+ if (put_user(val_byte(__val, 1), base + ptr) < 0) \
+ goto err_label; \
+ ptr--; \
+ if (put_user(val_byte(__val, 0), base + ptr) < 0) \
goto err_label; \
} while(0)
#define pushl(base, ptr, val, err_label) \
do { \
- int err; \
- __asm__ __volatile__( \
- "decw %w0\n\t" \
- "rorl $16,%3\n\t" \
- "1: movb %h3,0(%2,%0)\n\t" \
- "decw %w0\n\t" \
- "2: movb %b3,0(%2,%0)\n\t" \
- "decw %w0\n\t" \
- "rorl $16,%3\n\t" \
- "3: movb %h3,0(%2,%0)\n\t" \
- "decw %w0\n\t" \
- "4: movb %b3,0(%2,%0)\n\t" \
- "xor %1,%1\n\t" \
- "5:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "6: movl $1,%1\n\t" \
- " jmp 5b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,6b\n" \
- " .long 2b,6b\n" \
- " .long 3b,6b\n" \
- " .long 4b,6b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (err) \
- : "r" (base), "q" (val), "0" (ptr)); \
- if (err) \
+ __u32 __val = val; \
+ ptr--; \
+ if (put_user(val_byte(__val, 3), base + ptr) < 0) \
+ goto err_label; \
+ ptr--; \
+ if (put_user(val_byte(__val, 2), base + ptr) < 0) \
+ goto err_label; \
+ ptr--; \
+ if (put_user(val_byte(__val, 1), base + ptr) < 0) \
+ goto err_label; \
+ ptr--; \
+ if (put_user(val_byte(__val, 0), base + ptr) < 0) \
goto err_label; \
} while(0)
#define popb(base, ptr, err_label) \
({ \
- unsigned long __res; \
- unsigned int err; \
- __asm__ __volatile__( \
- "1:movb 0(%1,%0),%b2\n\t" \
- "incw %w0\n\t" \
- "xor %3,%3\n\t" \
- "2:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "3: movl $1,%1\n\t" \
- " jmp 2b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,3b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (base), "=q" (__res), \
- "=r" (err) \
- : "0" (ptr), "1" (base), "2" (0)); \
- if (err) \
+ __u8 __res; \
+ if (get_user(__res, base + ptr) < 0) \
goto err_label; \
+ ptr++; \
__res; \
})
#define popw(base, ptr, err_label) \
({ \
- unsigned long __res; \
- unsigned int err; \
- __asm__ __volatile__( \
- "1:movb 0(%1,%0),%b2\n\t" \
- "incw %w0\n\t" \
- "2:movb 0(%1,%0),%h2\n\t" \
- "incw %w0\n\t" \
- "xor %3,%3\n\t" \
- "3:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "4: movl $1,%1\n\t" \
- " jmp 3b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,4b\n" \
- " .long 2b,4b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (base), "=q" (__res), \
- "=r" (err) \
- : "0" (ptr), "1" (base), "2" (0)); \
- if (err) \
+ __u16 __res; \
+ if (get_user(val_byte(__res, 0), base + ptr) < 0) \
+ goto err_label; \
+ ptr++; \
+ if (get_user(val_byte(__res, 1), base + ptr) < 0) \
goto err_label; \
+ ptr++; \
__res; \
})
#define popl(base, ptr, err_label) \
({ \
- unsigned long __res; \
- unsigned int err; \
- __asm__ __volatile__( \
- "1:movb 0(%1,%0),%b2\n\t" \
- "incw %w0\n\t" \
- "2:movb 0(%1,%0),%h2\n\t" \
- "incw %w0\n\t" \
- "rorl $16,%2\n\t" \
- "3:movb 0(%1,%0),%b2\n\t" \
- "incw %w0\n\t" \
- "4:movb 0(%1,%0),%h2\n\t" \
- "incw %w0\n\t" \
- "rorl $16,%2\n\t" \
- "xor %3,%3\n\t" \
- "5:\n" \
- ".section .fixup,\"ax\"\n\t" \
- "6: movl $1,%1\n\t" \
- " jmp 5b\n\t" \
- ".previous\n" \
- ".section __ex_table,\"a\"\n" \
- " .align 4\n" \
- " .long 1b,6b\n" \
- " .long 2b,6b\n" \
- " .long 3b,6b\n" \
- " .long 4b,6b\n" \
- ".previous" \
- : "=r" (ptr), "=r" (base), "=q" (__res), \
- "=r" (err) \
- : "0" (ptr), "1" (base), "2" (0)); \
- if (err) \
+ __u32 __res; \
+ if (get_user(val_byte(__res, 0), base + ptr) < 0) \
+ goto err_label; \
+ ptr++; \
+ if (get_user(val_byte(__res, 1), base + ptr) < 0) \
+ goto err_label; \
+ ptr++; \
+ if (get_user(val_byte(__res, 2), base + ptr) < 0) \
+ goto err_label; \
+ ptr++; \
+ if (get_user(val_byte(__res, 3), base + ptr) < 0) \
goto err_label; \
+ ptr++; \
__res; \
})
@@ -550,7 +447,8 @@
* userspace programs to be able to handle it. (Getting a problem
* in userspace is always better than an Oops anyway.) [KD]
*/
-static void do_int(struct kernel_vm86_regs *regs, int i, unsigned char * ssp, unsigned long sp)
+static void do_int(struct kernel_vm86_regs *regs, int i,
+ unsigned char * ssp, unsigned short sp)
{
unsigned long *intr_ptr, segoffs;
@@ -605,7 +503,7 @@
void handle_vm86_fault(struct kernel_vm86_regs * regs, long error_code)
{
unsigned char *csp, *ssp;
- unsigned long ip, sp;
+ unsigned short ip, sp;
#define CHECK_IF_IN_TRAP \
if (VMPI.vm86dbg_active && VMPI.vm86dbg_TFpendig) \
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2002-07-28 16:37 [patch] vm86: Code cleanup Stas Sergeev
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