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Rather than duplicating the LDM/STM/LDC/STC fixup code between 

early_abort_fixup() and late_abort_fixup(), have the latter tail-call the
former.  This saves another 200 bytes, and I've found my ARM710a card now, so
I've even tested it.
This commit is contained in:
bjh21 2001-06-03 13:38:14 +00:00
parent c9d2bd8419
commit e1fdb3abbf
1 changed files with 18 additions and 88 deletions
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106
sys/arch/arm/arm/cpufunc.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: cpufunc.c,v 1.7 2001/06/02 22:30:07 bjh21 Exp $ */
/* $NetBSD: cpufunc.c,v 1.8 2001/06/03 13:38:14 bjh21 Exp $ */
/*
* arm8 support code Copyright (c) 1997 ARM Limited
@ -508,11 +508,14 @@ extern int pmap_debug_level;
#endif
#if defined(CPU_ARM2) || defined(CPU_ARM250) || defined(CPU_ARM3) || \
(defined(CPU_ARM6) && !defined(ARM6_LATE_ABORT))
defined(CPU_ARM6) || defined(CPU_ARM7)
/*
* "Early" data abort fixup.
*
* For ARM2, ARM2as, ARM3 and ARM6 (in early-abort mode).
* For ARM2, ARM2as, ARM3 and ARM6 (in early-abort mode). Also used
* indirectly by ARM6 (in late-abort mode) and ARM7.
*
* In early aborts, we may have to fix up LDM, STM, LDC and STC.
*/
int
early_abort_fixup(arg)
@ -667,13 +670,16 @@ early_abort_fixup(arg)
return(ABORT_FIXUP_OK);
}
#endif /* CPU_ARM2/250/3/6(!LATE) */
#endif /* CPU_ARM2/250/3/6/7 */
#if (defined(CPU_ARM6) && defined(ARM6_LATE_ABORT)) || defined(CPU_ARM7)
/*
* "Late" (base updated) data abort fixup
*
* For ARM6 (in late-abort mode) and ARM7.
*
* In this model, all data-transfer instructions need fixing up. We defer
* LDM, STM, LDC and STC fixup to the early-abort handler.
*/
int
late_abort_fixup(arg)
@ -822,88 +828,7 @@ late_abort_fixup(arg)
printf("r%d=%08x\n", base, registers[base]);
#endif /* DEBUG_FAULT_CORRECTION */
}
} else if ((fault_instruction & 0x0e000000) == 0x08000000) {
int base;
int loop;
int count;
int *registers = &frame->tf_r0;
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0) {
printf("LDM/STM\n");
disassemble(fault_pc);
}
#endif /* DEBUG_FAULT_CORRECTION */
if (fault_instruction & (1 << 21)) {
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
printf("This instruction must be corrected\n");
#endif /* DEBUG_FAULT_CORRECTION */
base = (fault_instruction >> 16) & 0x0f;
if (base == 15)
return ABORT_FIXUP_FAILED;
/* Count registers transferred */
count = 0;
for (loop = 0; loop < 16; ++loop) {
if (fault_instruction & (1<<loop))
++count;
}
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0) {
printf("%d registers used\n", count);
printf("Corrected r%d by %d bytes ", base, count * 4);
}
#endif /* DEBUG_FAULT_CORRECTION */
if (fault_instruction & (1 << 23)) {
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
printf("down\n");
#endif /* DEBUG_FAULT_CORRECTION */
registers[base] -= count * 4;
} else {
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
printf("up\n");
#endif /* DEBUG_FAULT_CORRECTION */
registers[base] += count * 4;
}
}
} else if ((fault_instruction & 0x0e000000) == 0x0c000000) {
int base;
int offset;
int *registers = &frame->tf_r0;
/* REGISTER CORRECTION IS REQUIRED FOR THESE INSTRUCTIONS */
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
disassemble(fault_pc);
#endif /* DEBUG_FAULT_CORRECTION */
/* Only need to fix registers if write back is turned on */
if ((fault_instruction & (1 << 21)) != 0) {
base = (fault_instruction >> 16) & 0x0f;
if (base == 13 && (frame->tf_spsr & PSR_MODE) == PSR_SVC32_MODE)
return ABORT_FIXUP_FAILED;
if (base == 15)
return ABORT_FIXUP_FAILED;
offset = (fault_instruction & 0xff) << 2;
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
printf("r%d=%08x\n", base, registers[base]);
#endif /* DEBUG_FAULT_CORRECTION */
if ((fault_instruction & (1 << 23)) != 0)
offset = -offset;
registers[base] += offset;
#ifdef DEBUG_FAULT_CORRECTION
if (pmap_debug_level >= 0)
printf("r%d=%08x\n", base, registers[base]);
#endif /* DEBUG_FAULT_CORRECTION */
}
} else if ((fault_instruction & 0x0e000000) == 0x0c000000)
return ABORT_FIXUP_FAILED;
}
if ((frame->tf_spsr & PSR_MODE) == PSR_SVC32_MODE) {
@ -931,9 +856,14 @@ late_abort_fixup(arg)
*/
}
return(ABORT_FIXUP_OK);
/*
* Now let the early-abort fixup routine have a go, in case it
* was an LDM, STM, LDC or STC that faulted.
*/
return early_abort_fixup(arg);
}
#endif /* CPU_ARM7 */
#endif /* CPU_ARM6(LATE)/7 */
/*
* CPU Setup code