| 1 | /* |
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| 2 | * pmon.S -- low-level entry points into PMON monitor. |
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| 3 | * |
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| 4 | * Copyright (c) 1996, 1997, 2002 Cygnus Support |
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| 5 | * |
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| 6 | * The authors hereby grant permission to use, copy, modify, distribute, |
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| 7 | * and license this software and its documentation for any purpose, provided |
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| 8 | * that existing copyright notices are retained in all copies and that this |
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| 9 | * notice is included verbatim in any distributions. No written agreement, |
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| 10 | * license, or royalty fee is required for any of the authorized uses. |
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| 11 | * Modifications to this software may be copyrighted by their authors |
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| 12 | * and need not follow the licensing terms described here, provided that |
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| 13 | * the new terms are clearly indicated on the first page of each file where |
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| 14 | * they apply. |
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| 15 | */ |
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| 16 | |
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| 17 | #ifdef __mips16 |
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| 18 | /* This file contains 32 bit assembly code. */ |
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| 19 | .set nomips16 |
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| 20 | #endif |
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| 21 | |
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| 22 | #if !defined(__mips64) |
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| 23 | /* This machine does not support 64-bit operations. */ |
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| 24 | #define ADDU addu |
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| 25 | #define SUBU subu |
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| 26 | #else |
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| 27 | /* This machine supports 64-bit operations. */ |
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| 28 | #define ADDU daddu |
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| 29 | #define SUBU dsubu |
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| 30 | #endif |
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| 31 | |
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| 32 | #include "regs.S" |
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| 33 | |
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| 34 | .text |
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| 35 | .align 2 |
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| 36 | |
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| 37 | #ifdef LSI |
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| 38 | #define PMON_VECTOR 0xffffffffbfc00200 |
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| 39 | #else |
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| 40 | #define PMON_VECTOR 0xffffffffbfc00500 |
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| 41 | #endif |
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| 42 | |
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| 43 | #ifndef __mips_eabi |
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| 44 | /* Provide named functions for entry into the monitor: */ |
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| 45 | #define INDIRECT(name,index) \ |
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| 46 | .globl name; \ |
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| 47 | .ent name; \ |
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| 48 | .set noreorder; \ |
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| 49 | name: la $2,+(PMON_VECTOR+((index)*4)); \ |
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| 50 | lw $2,0($2); \ |
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| 51 | j $2; \ |
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| 52 | nop; \ |
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| 53 | .set reorder; \ |
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| 54 | .end name |
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| 55 | |
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| 56 | #else |
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| 57 | #define INDIRECT(name,index) \ |
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| 58 | .globl name; \ |
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| 59 | .ent name; \ |
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| 60 | .set noreorder; \ |
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| 61 | name: la $2,+(PMON_VECTOR+((index)*4)); \ |
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| 62 | lw $2,0($2); \ |
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| 63 | SUBU sp,sp,0x40; \ |
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| 64 | sd ra,0x38(sp); \ |
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| 65 | sd fp,0x30(sp); \ |
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| 66 | jal $2; \ |
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| 67 | move fp,sp; \ |
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| 68 | ld ra,0x38(sp); \ |
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| 69 | ld fp,0x30(sp); \ |
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| 70 | j ra; \ |
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| 71 | ADDU sp,sp,0x40; \ |
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| 72 | .set reorder; \ |
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| 73 | .end name |
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| 74 | #endif |
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| 75 | |
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| 76 | |
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| 77 | /* The following magic numbers are for the slots into the PMON monitor */ |
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| 78 | /* The first are used as the lo-level library run-time: */ |
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| 79 | INDIRECT(read,0) |
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| 80 | INDIRECT(write,1) |
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| 81 | INDIRECT(open,2) |
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| 82 | INDIRECT(close,3) |
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| 83 | /* The following are useful monitor routines: */ |
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| 84 | INDIRECT(mon_ioctl,4) |
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| 85 | INDIRECT(mon_printf,5) |
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| 86 | INDIRECT(mon_vsprintf,6) |
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| 87 | INDIRECT(mon_ttctl,7) |
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| 88 | INDIRECT(mon_cliexit,8) |
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| 89 | INDIRECT(mon_getenv,9) |
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| 90 | INDIRECT(mon_onintr,10) |
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| 91 | INDIRECT(mon_flush_cache,11) |
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| 92 | INDIRECT(_flush_cache,11) |
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| 93 | INDIRECT(mon_exception,12) |
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| 94 | |
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| 95 | /* The following routine is required by the "print()" function: */ |
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| 96 | .globl outbyte |
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| 97 | .ent outbyte |
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| 98 | .set noreorder |
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| 99 | outbyte: |
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| 100 | subu sp,sp,0x20 /* allocate stack space for string */ |
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| 101 | sd ra,0x18(sp) /* stack return address */ |
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| 102 | sd fp,0x10(sp) /* stack frame-pointer */ |
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| 103 | move fp,sp /* take a copy of the stack pointer */ |
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| 104 | /* We leave so much space on the stack for the string (16 |
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| 105 | characters), since the call to mon_printf seems to corrupt |
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| 106 | the 8bytes at offset 8 into the string/stack. */ |
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| 107 | sb a0,0x00(sp) /* character to print */ |
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| 108 | sb z0,0x01(sp) /* NUL terminator */ |
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| 109 | jal mon_printf /* and output the string */ |
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| 110 | move a0,sp /* take a copy of the string pointer {DELAY SLOT} */ |
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| 111 | |
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| 112 | move sp,fp /* recover stack pointer */ |
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| 113 | ld ra,0x18(sp) /* recover return address */ |
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| 114 | ld fp,0x10(sp) /* recover frame-pointer */ |
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| 115 | j ra /* return to the caller */ |
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| 116 | addu sp,sp,0x20 /* dump the stack space {DELAY SLOT} */ |
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| 117 | .set reorder |
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| 118 | .end outbyte |
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| 119 | |
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| 120 | /* The following routine is required by the "sbrk()" function: */ |
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| 121 | .globl get_mem_info |
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| 122 | .ent get_mem_info |
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| 123 | .set noreorder |
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| 124 | get_mem_info: |
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| 125 | # in: a0 = pointer to 3 word structure |
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| 126 | # out: void |
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| 127 | subu sp,sp,0x18 /* create some stack space */ |
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| 128 | sd ra,0x00(sp) /* stack return address */ |
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| 129 | sd fp,0x08(sp) /* stack frame-pointer */ |
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| 130 | sd a0,0x10(sp) /* stack structure pointer */ |
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| 131 | move fp,sp /* take a copy of the stack pointer */ |
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| 132 | |
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| 133 | # The monitor has already sized memory, but unfortunately we |
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| 134 | # do not have access to the data location containing the |
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| 135 | # memory size. |
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| 136 | |
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| 137 | jal __sizemem |
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| 138 | nop |
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| 139 | |
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| 140 | ld a0,0x10(sp) # recover structure pointer |
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| 141 | sw v0,0(a0) # amount of memory available |
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| 142 | |
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| 143 | # Deal with getting the cache size information: |
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| 144 | mfc0 a1, C0_CONFIG |
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| 145 | nop |
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| 146 | nop |
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| 147 | andi a2,a1,0x7 << 9 # bits 11..9 for instruction cache size |
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| 148 | sll a2,a2,12 - 8 |
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| 149 | sw a2,4(a0) |
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| 150 | andi a2,a1,0x7 << 6 # bits 8..6 for data cache size |
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| 151 | sll a2,a2,12 - 5 |
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| 152 | sw a2,8(a0) # data cache size |
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| 153 | # |
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| 154 | move sp,fp /* recover stack pointer */ |
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| 155 | ld ra,0x00(sp) /* recover return address */ |
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| 156 | ld fp,0x08(sp) /* recover frame-pointer */ |
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| 157 | j ra /* return to the caller */ |
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| 158 | addu sp,sp,0x18 /* restore stack pointer {DELAY SLOT} */ |
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| 159 | .set reorder |
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| 160 | .end get_mem_info |
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| 161 | |
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| 162 | #ifdef LSI |
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| 163 | |
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| 164 | # For the LSI MiniRISC board, we can safely assume that we have |
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| 165 | # at least one megabyte of RAM. |
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| 166 | |
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| 167 | .globl __sizemem |
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| 168 | .ent __sizemem |
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| 169 | __sizemem: |
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| 170 | li v0,0x100000 |
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| 171 | j ra |
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| 172 | .end __sizemem |
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| 173 | #else |
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| 174 | |
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| 175 | |
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| 176 | #endif |
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| 177 | /* EOF pmon.S */ |
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