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