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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [libgloss/] [mips/] [pmon.S] - Blame information for rev 829

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1 207 jeremybenn
/*
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 * pmon.S -- low-level entry points into PMON monitor.
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 *
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 * Copyright (c) 1996, 1997, 2002 Cygnus Support
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 *
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 * The authors hereby grant permission to use, copy, modify, distribute,
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 * and license this software and its documentation for any purpose, provided
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 * that existing copyright notices are retained in all copies and that this
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 * notice is included verbatim in any distributions. No written agreement,
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 * license, or royalty fee is required for any of the authorized uses.
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 * Modifications to this software may be copyrighted by their authors
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 * and need not follow the licensing terms described here, provided that
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 * the new terms are clearly indicated on the first page of each file where
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 * they apply.
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 */
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#ifdef __mips16
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/* This file contains 32 bit assembly code.  */
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        .set nomips16
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#endif
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#if !defined(__mips64)
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  /* This machine does not support 64-bit operations.  */
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  #define ADDU addu
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  #define SUBU subu
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#else
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  /* This machine supports 64-bit operations.  */
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  #define ADDU daddu
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  #define SUBU dsubu
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#endif
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#include "regs.S"
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        .text
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        .align  2
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#ifdef LSI
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  #define PMON_VECTOR 0xffffffffbfc00200
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#else
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  #define PMON_VECTOR 0xffffffffbfc00500
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#endif
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#ifndef __mips_eabi
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/* Provide named functions for entry into the monitor: */
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#define INDIRECT(name,index)                            \
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        .globl  name;                                   \
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        .ent    name;                                   \
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        .set    noreorder;                              \
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name:   la      $2,+(PMON_VECTOR+((index)*4));          \
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        lw      $2,0($2);                               \
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        j       $2;                                     \
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        nop;                                            \
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        .set    reorder;                                \
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        .end    name
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#else
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#define INDIRECT(name,index)                            \
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        .globl  name;                                   \
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        .ent    name;                                   \
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        .set    noreorder;                              \
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name:   la      $2,+(PMON_VECTOR+((index)*4));          \
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        lw      $2,0($2);                               \
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        SUBU    sp,sp,0x40;                             \
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        sd      ra,0x38(sp);                            \
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        sd      fp,0x30(sp);                            \
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        jal     $2;                                     \
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        move    fp,sp;                                  \
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        ld      ra,0x38(sp);                            \
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        ld      fp,0x30(sp);                            \
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        j       ra;                                     \
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        ADDU    sp,sp,0x40;                             \
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        .set    reorder;                                \
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        .end    name
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#endif
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/* The following magic numbers are for the slots into the PMON monitor */
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/* The first are used as the lo-level library run-time: */
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INDIRECT(read,0)
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INDIRECT(write,1)
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INDIRECT(open,2)
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INDIRECT(close,3)
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/* The following are useful monitor routines: */
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INDIRECT(mon_ioctl,4)
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INDIRECT(mon_printf,5)
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INDIRECT(mon_vsprintf,6)
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INDIRECT(mon_ttctl,7)
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INDIRECT(mon_cliexit,8)
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INDIRECT(mon_getenv,9)
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INDIRECT(mon_onintr,10)
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INDIRECT(mon_flush_cache,11)
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INDIRECT(_flush_cache,11)
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INDIRECT(mon_exception,12)
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/* The following routine is required by the "print()" function: */
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        .globl  outbyte
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        .ent    outbyte
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        .set    noreorder
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outbyte:
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        subu    sp,sp,0x20      /* allocate stack space for string */
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        sd      ra,0x18(sp)     /* stack return address */
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        sd      fp,0x10(sp)     /* stack frame-pointer */
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        move    fp,sp           /* take a copy of the stack pointer */
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        /* We leave so much space on the stack for the string (16
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           characters), since the call to mon_printf seems to corrupt
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           the 8bytes at offset 8 into the string/stack. */
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        sb      a0,0x00(sp)     /* character to print */
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        sb      z0,0x01(sp)     /* NUL terminator */
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        jal     mon_printf      /* and output the string */
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        move    a0,sp           /* take a copy of the string pointer {DELAY SLOT} */
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        move    sp,fp           /* recover stack pointer */
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        ld      ra,0x18(sp)     /* recover return address */
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        ld      fp,0x10(sp)     /* recover frame-pointer */
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        j       ra              /* return to the caller */
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        addu    sp,sp,0x20      /* dump the stack space {DELAY SLOT} */
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        .set    reorder
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        .end    outbyte
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/* The following routine is required by the "sbrk()" function: */
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        .globl  get_mem_info
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        .ent    get_mem_info
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        .set    noreorder
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get_mem_info:
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        # in:  a0 = pointer to 3 word structure
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        # out: void
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        subu    sp,sp,0x18      /* create some stack space */
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        sd      ra,0x00(sp)     /* stack return address */
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        sd      fp,0x08(sp)     /* stack frame-pointer */
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        sd      a0,0x10(sp)     /* stack structure pointer */
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        move    fp,sp           /* take a copy of the stack pointer */
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        # The monitor has already sized memory, but unfortunately we
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        # do not have access to the data location containing the
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        # memory size.
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        jal     __sizemem
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        nop
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        ld      a0,0x10(sp)     # recover structure pointer
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        sw      v0,0(a0)        # amount of memory available
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        # Deal with getting the cache size information:
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        mfc0    a1, C0_CONFIG
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        nop
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        nop
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        andi    a2,a1,0x7 << 9  # bits 11..9 for instruction cache size
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        sll     a2,a2,12 - 8
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        sw      a2,4(a0)
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        andi    a2,a1,0x7 << 6  # bits 8..6 for data cache size
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        sll     a2,a2,12 - 5
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        sw      a2,8(a0)        # data cache size
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        #
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        move    sp,fp           /* recover stack pointer */
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        ld      ra,0x00(sp)     /* recover return address */
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        ld      fp,0x08(sp)     /* recover frame-pointer */
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        j       ra              /* return to the caller */
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        addu    sp,sp,0x18      /* restore stack pointer {DELAY SLOT} */
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        .set    reorder
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        .end    get_mem_info
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#ifdef LSI
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# For the LSI MiniRISC board, we can safely assume that we have
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# at least one megabyte of RAM.
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        .globl  __sizemem
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        .ent    __sizemem
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__sizemem:
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        li      v0,0x100000
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        j       ra
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        .end    __sizemem
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#else
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#endif
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/* EOF pmon.S */

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