sm64/enhancements/crash.inc.s
2019-08-25 00:46:40 -04:00

159 lines
4.1 KiB
ArmAsm

# SM64 Crash Handler
# See Readme below.
.set COP0_CAUSE, 13
.set COP0_EPC, 14
.set COP0_BADVADDR, 8
/* ---------------------------------------------------------------
* IMPORTANT README:
* ---------------------------------------------------------------
* To use this crash screen, in lib/__osExceptionPreamble.s, change
* the function to use the following assembly:
*
* lui $k0, %hi(__crash_handler_entry)
* addiu $k0, $k0, %lo(__crash_handler_entry)
* jr $k0
* nop
*
* Doing just a jal __crash_handler_entry will cause mupen recompiler
* errors, so be sure to use the original exception style assembly
* above!
*
* Be sure to add #include "../../enhancements/crash.inc.c" to
* the top of game.c. Add .include "../enhancements/crash.inc.s" to
* the bottom of asm/decompress.s. Add "../enhancements/crash.h" to
* the top of sm64.h, above the CRASH_SCREEN_INCLUDED condition.
*
* See the DEBUG_ASSERT macro on how to call the crash screen for
* detected exceptions.
*/
glabel crashFont
.incbin "enhancements/crash_font.bin"
.align 4
glabel exceptionRegContext
.fill 0x108
glabel pAssertFile
.dword 0
glabel nAssertLine
.dword 0
glabel pAssertExpression
.dword 0
glabel nAssertStopProgram
.dword 0
glabel _n64_assert
lui $at, %hi(pAssertFile)
sw $a0, %lo(pAssertFile)($at)
lui $at, %hi(nAssertLine)
sw $a1, %lo(nAssertLine)($at)
lui $at, %hi(pAssertExpression)
sw $a2, %lo(pAssertExpression)($at)
lui $at, %hi(nAssertStopProgram)
sw $a3, %lo(nAssertStopProgram)($at)
beqz $a3, .end_2
nop
syscall # trigger crash screen
.end_2:
jr $ra
nop
glabel cop0_get_cause
jr $ra
mfc0 $v0, $13 # COP0_CAUSE
glabel cop0_get_epc
jr $ra
mfc0 $v0, $14 # COP0_EPC
glabel cop0_get_badvaddr
jr $ra
mfc0 $v0, $8 # COP0_BADVADDR
# If the error code field of cop0's cause register is non-zero,
# draw crash details to the screen and hang
#
# If there wasn't an error, continue to the original handler
glabel __crash_handler_entry
la $k0, exceptionRegContext
sd $zero, 0x018 ($k0)
sd $at, 0x020 ($k0)
sd $v0, 0x028 ($k0)
sd $v1, 0x030 ($k0)
sd $a0, 0x038 ($k0)
sd $a1, 0x040 ($k0)
sd $a2, 0x048 ($k0)
sd $a3, 0x050 ($k0)
sd $t0, 0x058 ($k0)
sd $t1, 0x060 ($k0)
sd $t2, 0x068 ($k0)
sd $t3, 0x070 ($k0)
sd $t4, 0x078 ($k0)
sd $t5, 0x080 ($k0)
sd $t6, 0x088 ($k0)
sd $t7, 0x090 ($k0)
sd $s0, 0x098 ($k0)
sd $s1, 0x0A0 ($k0)
sd $s2, 0x0A8 ($k0)
sd $s3, 0x0B0 ($k0)
sd $s4, 0x0B8 ($k0)
sd $s5, 0x0C0 ($k0)
sd $s6, 0x0C8 ($k0)
sd $s7, 0x0D0 ($k0)
sd $t8, 0x0D8 ($k0)
sd $t9, 0x0E0 ($k0)
sd $gp, 0x0E8 ($k0)
sd $sp, 0x0F0 ($k0)
sd $s8, 0x0F8 ($k0)
sd $ra, 0x100 ($k0)
mfc0 $t0, $13 # COP0_CAUSE
srl $t0, $t0, 2
andi $t0, $t0, 0x1F
beqz $t0, .end
nop
# cop unusable exception fired twice on startup so we'll ignore it for now
li $at, 0x0B
beq $t0, $at, .end
nop
jal show_crash_screen_and_hang
nop
.end:
ld $zero, 0x018 ($k0)
ld $at, 0x020 ($k0)
ld $v0, 0x028 ($k0)
ld $v1, 0x030 ($k0)
ld $a0, 0x038 ($k0)
ld $a1, 0x040 ($k0)
ld $a2, 0x048 ($k0)
ld $a3, 0x050 ($k0)
ld $t0, 0x058 ($k0)
ld $t1, 0x060 ($k0)
ld $t2, 0x068 ($k0)
ld $t3, 0x070 ($k0)
ld $t4, 0x078 ($k0)
ld $t5, 0x080 ($k0)
ld $t6, 0x088 ($k0)
ld $t7, 0x090 ($k0)
ld $s0, 0x098 ($k0)
ld $s1, 0x0A0 ($k0)
ld $s2, 0x0A8 ($k0)
ld $s3, 0x0B0 ($k0)
ld $s4, 0x0B8 ($k0)
ld $s5, 0x0C0 ($k0)
ld $s6, 0x0C8 ($k0)
ld $s7, 0x0D0 ($k0)
ld $t8, 0x0D8 ($k0)
ld $t9, 0x0E0 ($k0)
ld $gp, 0x0E8 ($k0)
ld $sp, 0x0F0 ($k0)
ld $s8, 0x0F8 ($k0)
ld $ra, 0x100 ($k0)
lui $k0, %hi(__osException)
addiu $k0, $k0, %lo(__osException)
jr $k0 # run the original handler
nop