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jeremybenn |
/* inst-set-test.S. Instruction set test library for Or1ksim
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*
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* Copyright (C) 1999-2006 OpenCores
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* Copyright (C) 2010 Embecosm Limited
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*
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* Contributors various OpenCores participants
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* Contributor Jeremy Bennett
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*
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* This file is part of OpenRISC 1000 Architectural Simulator.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 3 of the License, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program. If not, see .
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*/
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/* ----------------------------------------------------------------------------
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* Coding conventions
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*
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* A simple rising stack is provided starting at _stack and pointed to by
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* r1. r1 points to the next free word. Only 32-bit registers may be pushed
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* onto the stack.
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*
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* Local labels up to 49 are reserved for macros. Each is used only once in
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* all macros. You can get in a serious mess if you get local label clashing
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* in macros.
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*
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* Arguments to functions are passed in r3 through r8.
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* r9 is the link (return address)
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* r11 is for returning results
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*
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* Only r1 and r2 are preserved across function calls. It is up to the callee
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* to save any other registers required.
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* ------------------------------------------------------------------------- */
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/* ----------------------------------------------------------------------------
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* This library contains the stack implementation and reset sequence and a set
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* of library functions.
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*
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* The functions provided here provide simple utilities that are useful when
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* writing tests in assembler.
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* ------------------------------------------------------------------------- */
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#include "inst-set-test.h"
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/* ----------------------------------------------------------------------------
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* Simple stack, will be pointed to by r1, which is the next empty slot
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* ------------------------------------------------------------------------- */
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.section .stack
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.balign 4
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.global _stack
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_stack:
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.space 0x1000,0x0
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/* ----------------------------------------------------------------------------
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* Exception handling
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* ------------------------------------------------------------------------- */
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.section .boot-text
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/* ----------------------------------------------------------------------------
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* Reset exception
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*
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* Set up the stack and jump to _start
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* ------------------------------------------------------------------------- */
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.org 0x100
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.global _reset
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_reset:
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l.movhi r1,hi(_stack) /* Set up the stack */
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l.ori r1,r1,lo(_stack)
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l.j _start /* Jump to the start of code */
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l.nop
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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 space.
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*
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* Print a message about the instruction triggering the exception. Then
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* replace it by l.nop and return.
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* ------------------------------------------------------------------------- */
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.section .rodata
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50: .string " RANGE 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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.org 0xb00
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.global _range
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_range:
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/* Note exception */
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LOAD_CONST (r3, 50b)
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l.jal _puts
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l.nop
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/* Report problem instruction */
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LOAD_CONST (r3, 51b)
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l.jal _puts
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l.nop
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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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l.nop NOP_REPORT
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/* Report status register */
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LOAD_CONST (r3, 52b)
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l.jal _puts
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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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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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_range_end:
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/* ----------------------------------------------------------------------------
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* End of exception vectors
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*
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* Guarantee the exception vector space does not have general purpose code
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* ------------------------------------------------------------------------- */
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.org 0xffc
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l.nop
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/* ----------------------------------------------------------------------------
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* All subroutines are in the text section.
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* ------------------------------------------------------------------------- */
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.section .text
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/* ----------------------------------------------------------------------------
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* Subroutine to print out a string
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*
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* The string is followed by a newline
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*
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* Parameters:
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* r3 Pointer to the string to print
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* ------------------------------------------------------------------------- */
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.global _puts
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_puts:
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l.add r2,r0,r3 /* Copy the string pointer */
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/* Loop getting and printing each char until end of string */
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60: l.lbz r3,0(r2)
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l.sfeq r3,r0 /* NULL termination? */
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l.bf 61f
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l.addi r2,r2,1 /* Delay slot, move to next char */
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l.j 60b /* Repeat */
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l.nop NOP_PUTC /* Delay slot */
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61: l.jr r9 /* Return */
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out a test name prompt
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*
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* The string is preceded by two spaces
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*
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* Parameters:
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* r3 Pointer to the test name to print
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* ------------------------------------------------------------------------- */
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.global _ptest
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_ptest:
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PUSH(r9) /* Save the return address */
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PUSH(r3) /* Save the test name for later */
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LOAD_STR(r3, " ") /* Prefix */
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l.jal _puts
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l.nop
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POP(r3) /* Test name */
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out "OK"
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*
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* The string is followed by a newline
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* ------------------------------------------------------------------------- */
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.global _pok
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_pok:
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PUSH(r9) /* Save the return address */
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LOAD_STR(r3, "OK\n")
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out "Failed"
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*
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* The string is followed by a ": ", which will then allow a report
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* ------------------------------------------------------------------------- */
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.global _pfail
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_pfail:
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PUSH(r9) /* Save the return address */
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LOAD_STR(r3, "Failed: ")
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out "TRUE"
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* ------------------------------------------------------------------------- */
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.global _ptrue
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_ptrue:
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PUSH(r9) /* Save the return address */
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LOAD_STR(r3, "TRUE")
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out "FALSE"
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* ------------------------------------------------------------------------- */
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.global _pfalse
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_pfalse:
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PUSH(r9) /* Save the return address */
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LOAD_STR(r3, "FALSE")
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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/* ----------------------------------------------------------------------------
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* Subroutine to print out "unexpected"
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*
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* Preceded by a space and followed by a newline
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* ------------------------------------------------------------------------- */
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.global _punexpected
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_punexpected:
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PUSH(r9) /* Save the return address */
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LOAD_STR(r3, " unexpected\n")
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l.jal _puts
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l.nop
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POP (r9)
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l.jr r9
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l.nop
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