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