[OpenBIOS] [commit] r1220 - trunk/openbios-devel/arch/sparc32
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svn at openbios.org
Mon Aug 19 14:58:03 CEST 2013
Author: mcayland
Date: Mon Aug 19 14:58:03 2013
New Revision: 1220
URL: http://tracker.coreboot.org/trac/openbios/changeset/1220
Log:
SPARC32: implement data fault handler
Implement a trivial data fault handler for SPARC32 to skip over a faulting
instruction when the ignore_dfault variable is non-zero.
Signed-off-by: Bob Breuer <breuerr at mc.net>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland at ilande.co.uk>
Modified:
trunk/openbios-devel/arch/sparc32/vectors.S
Modified: trunk/openbios-devel/arch/sparc32/vectors.S
==============================================================================
--- trunk/openbios-devel/arch/sparc32/vectors.S Mon Aug 19 14:58:00 2013 (r1219)
+++ trunk/openbios-devel/arch/sparc32/vectors.S Mon Aug 19 14:58:03 2013 (r1220)
@@ -41,6 +41,9 @@
#define WINDOW_FILL \
rd %psr, %l0; rd %wim, %l3; b fill_window_entry; nop;
+#define TRAP_DFAULT(lvl) \
+ rd %psr, %l0; rd %wim, %l3; b handle_dfault; mov lvl, %l7;
+
#define BTRAP(lvl) ba bug; mov lvl, %g1; nop; nop;
#define BTRAPS(x) BTRAP(x) BTRAP(x+1) BTRAP(x+2) BTRAP(x+3) BTRAP(x+4) BTRAP(x+5) BTRAP(x+6) BTRAP(x+7)
#define TRAP_ENTRY_INTERRUPT(int_level) \
@@ -54,7 +57,9 @@
t_wovf: WINDOW_SPILL /* Window Overflow */
t_wunf: WINDOW_FILL /* Window Underflow */
BTRAP(0x7)
- BTRAPS(0x8)
+ BTRAP(0x8)
+ TRAP_DFAULT(0x9)
+ BTRAP(0xa) BTRAP(0xb) BTRAP(0xc) BTRAP(0xd) BTRAP(0xe) BTRAP(0xf)
#if 0
BAD_TRAP(0x10)
t_irq1: TRAP_ENTRY_INTERRUPT(1) /* IRQ Software/SBUS Level 1 */
@@ -80,7 +85,10 @@
t_irq14: TRAP_ENTRY_INTERRUPT(14) /* IRQ Timer #2 */
BTRAP(0x1f)
#endif
- BTRAPS(0x20) BTRAPS(0x28)
+ BTRAPS(0x20)
+ BTRAP(0x28)
+ TRAP_DFAULT(0x29)
+ BTRAP(0x2a) BTRAP(0x2b) BTRAP(0x2c) BTRAP(0x2d) BTRAP(0x2e) BTRAP(0x2f)
BTRAPS(0x30) BTRAPS(0x38)
BTRAPS(0x40) BTRAPS(0x48)
BTRAPS(0x50) BTRAPS(0x58)
@@ -206,6 +214,30 @@
#include "wof.S"
#include "wuf.S"
+/* Data fault handler */
+ .data
+ .align 4
+ .global ignore_dfault
+
+ignore_dfault:
+ .word 0
+
+ .text
+ .align 4
+
+handle_dfault:
+ /* If ignore_dfault is 0, fall through to normal exception handler */
+ sethi %hi(ignore_dfault), %l4
+ ld [%l4 + %lo(ignore_dfault)], %l4
+ tst %l4
+ bz,a bug
+ mov %l7, %g1
+
+ /* Otherwise skip the faulting instruction and return */
+ jmp %l2
+ rett %l2 + 4
+
+
.section .rodata
_BUG_message_0:
.string "Unhandled Exception 0x"
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