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Line 77... |
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l.j _start /* Jump to the start of code */
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l.j _start /* Jump to the start of code */
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l.nop
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l.nop
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/* ----------------------------------------------------------------------------
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/* ----------------------------------------------------------------------------
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* Range exception
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* Alignment exception
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*
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*
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* Don't be tempted to use the LOAD_STR macro here, it will dump us back into
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* Don't be tempted to use the LOAD_STR macro here, it will dump us back into
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* text space.
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* text section.
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*
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* The handling is a bit dubious at present. We just patch the instruction and
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* restart. This will go wrong in branch delay slots. Really we need to single
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* step past and then continue.
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*
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*
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* Print a message about the instruction triggering the exception. Then
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* Print a message identifying the exception type.
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* replace it by l.nop and return.
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* ------------------------------------------------------------------------- */
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* ------------------------------------------------------------------------- */
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.section .rodata
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.section .rodata
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50: .string " RANGE exception\n"
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50: .string " ALIGNMENT exception\n"
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51: .string " - caused by: "
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52: .string " - SR value: "
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.section .boot-text
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.section .boot-text
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.org 0xb00
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.org 0x600
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.global _range
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.global _align
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_range:
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_align:
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/* Note exception */
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/* Report exception */
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LOAD_CONST (r3, 50b)
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LOAD_CONST (r3, 50b)
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l.jal _puts
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l.jal _puts
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l.nop
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l.nop
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/* Report problem instruction */
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/* Patch with l.nop */
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l.mfspr r2,r0,SPR_EPCR_BASE /* Addr of problem instr */
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LOAD_CONST (r3, 0x15000000) /* l.nop */
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l.sw 0(r2),r3
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/* All done */
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l.rfe
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_align_end:
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/* ----------------------------------------------------------------------------
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* Illegal instruction exception
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*
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* Don't be tempted to use the LOAD_STR macro here, it will dump us back into
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* text section.
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*
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* The handling is a bit dubious at present. We just patch the instruction and
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* restart. This will go wrong in branch delay slots. Really we need to single
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* step past and then continue.
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*
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* Print a message identifying the exception type.
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* ------------------------------------------------------------------------- */
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.section .rodata
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51: .string " ILLEGAL INSTRUCTION exception\n"
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.section .boot-text
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.org 0x700
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.global _illegal
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_illegal:
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/* Report exception */
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LOAD_CONST (r3, 51b)
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LOAD_CONST (r3, 51b)
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l.jal _puts
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l.jal _puts
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l.nop
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l.nop
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/* Patch with l.nop */
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l.mfspr r2,r0,SPR_EPCR_BASE /* Addr of problem instr */
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l.mfspr r2,r0,SPR_EPCR_BASE /* Addr of problem instr */
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l.lws r3,0(r2) /* The actual instruction */
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LOAD_CONST (r3, 0x15000000) /* l.nop */
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l.nop NOP_REPORT
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l.sw 0(r2),r3
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/* All done */
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l.rfe
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_illegal_end:
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/* Report status register */
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/* ----------------------------------------------------------------------------
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* Range exception
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*
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* Don't be tempted to use the LOAD_STR macro here, it will dump us back into
|
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* text section.
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*
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* The handling is a bit dubious at present. We just patch the instruction and
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* restart. This will go wrong in branch delay slots. Really we need to single
|
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* step past and then continue.
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*
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* Print a message identifying the exception type.
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* ------------------------------------------------------------------------- */
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.section .rodata
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52: .string " RANGE exception\n"
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.section .boot-text
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.org 0xb00
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.global _range
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_range:
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/* Report exception */
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LOAD_CONST (r3, 52b)
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LOAD_CONST (r3, 52b)
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l.jal _puts
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l.jal _puts
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l.nop
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l.nop
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l.mfspr r3,r0,SPR_ESR_BASE /* Status reg */
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l.nop NOP_REPORT
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/* Patch with l.nop */
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/* Patch with l.nop */
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l.mfspr r2,r0,SPR_EPCR_BASE /* Addr of problem instr */
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l.mfspr r2,r0,SPR_EPCR_BASE /* Addr of problem instr */
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LOAD_CONST (r3, 0x15000000) /* l.nop */
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LOAD_CONST (r3, 0x15000000) /* l.nop */
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l.sw 0(r2),r3
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l.sw 0(r2),r3
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