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2001-04-16 Joel Sherrill <joel@OARcorp.com>

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* start/start.S, startup/bspstart.c, startup/linkcmds:
	Modifications made with Gregory Menke <gregory.menke@gsfc.nasa.gov>
	as he debugged this BSP using a logic analyzer.
This commit is contained in:
Joel Sherrill
2001-04-16 19:30:12 +00:00
parent 090de1adf5
commit 3491e9e544
3 changed files with 130 additions and 81 deletions
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6
c/src/lib/libbsp/mips/genmongoosev/ChangeLog
View File

@@ -1,3 +1,9 @@
2001-04-16 Joel Sherrill <joel@OARcorp.com>
* start/start.S, startup/bspstart.c, startup/linkcmds:
Modifications made with Gregory Menke <gregory.menke@gsfc.nasa.gov>
as he debugged this BSP using a logic analyzer.
2001-03-14 Joel Sherrill <joel@OARcorp.com>
* clock/clockdrv.c, console/conscfg.c, include/bsp.h, start/start.S,

201
c/src/lib/libbsp/mips/genmongoosev/start/start.S
View File

@@ -27,17 +27,8 @@
.set nomips16
#endif
#include <asm.h>
#include "regs.S"
/*
* Set up some room for a stack. We just grab a chunk of memory.
*/
#define STACK_SIZE 0x4000
#define GLOBAL_SIZE 0x2000
#define STARTUP_STACK_SIZE 0x0100
/* This is for referencing addresses that are not in the .sdata or
.sbss section under embedded-pic, or before we've set up gp. */
#ifdef __mips_embedded_pic
@@ -50,10 +41,43 @@
# define LA(t,x) la t,x
#endif /* __mips_embedded_pic */
.comm __memsize, 12
.comm __lstack, STARTUP_STACK_SIZE
.comm __stackbase,4
#define zero $0
#define AT $1 /* assembler temporaries */
#define v0 $2 /* value holders */
#define v1 $3
#define a0 $4 /* arguments */
#define a1 $5
#define a2 $6
#define a3 $7
#define t0 $8 /* temporaries */
#define t1 $9
#define t2 $10
#define t3 $11
#define t4 $12
#define t5 $13
#define t6 $14
#define t7 $15
#define s0 $16 /* saved registers */
#define s1 $17
#define s2 $18
#define s3 $19
#define s4 $20
#define s5 $21
#define s6 $22
#define s7 $23
#define t8 $24 /* temporaries */
#define t9 $25
#define k0 $26 /* kernel registers */
#define k1 $27
#define gp $28 /* global pointer */
#define sp $29 /* stack pointer */
#define s8 $30 /* saved register */
#define fp $30 /* frame pointer (old usage) */
#define ra $31 /* return address */
.text
.align 2
@@ -62,11 +86,43 @@
* start of the .text section.
*/
nop
.globl _start
.ent _start
_start:
.set noreorder
# Get the address of start into $5 in a position independent fashion.
# This lets us know whether we have been relocated or not.
$LF1 = . + 8
bal $LF1
nop
_branch:
move $5, $31 # $5 == where are we
li $6, 0x8002000c # $6 == where we want to be
beq $5, $6, _start_in_ram
nop
# relocate the code from EEPROM to RAM
la $7, _edata
relocate:
lw $8, ($5) # $8 = *EEPROM
addu $5, $5, 4 # EEPROM++
sw $8, ($6) # *RAM = $8
addu $6, $6, 4 # RAM++
bne $6, $7, relocate # copied all the way to edata?
nop
la $6, _start_in_ram
jr $6
nop
.end _start
.globl _start_in_ram
.ent _start_in_ram
_start_in_ram:
nop
#ifdef __mips_embedded_pic
PICBASE = .+8
bal PICBASE
@@ -116,9 +172,6 @@ _start:
* zero out the bss section.
*/
.globl __memsize
.globl get_mem_info .text
.globl __stack
.globl __global
.globl zerobss
.ent zerobss
zerobss:
@@ -129,22 +182,7 @@ zerobss:
bltu v0,v1,3b
addiu v0,v0,4 # executed in delay slot
la t0, __lstack # make a small stack so we
addiu sp, t0, STARTUP_STACK_SIZE # can run some C code
la a0, __memsize # get the usable memory size
jal get_mem_info
nop
/* setup the stack pointer */
LA (t0, __stack) # is __stack set ?
bne t0,zero,4f
nop
/* NOTE: a0[0] contains the amount of memory available, and
not the last memory address. */
lw t0,0(a0) # last address of memory available
la t1,K0BASE # cached kernel memory
addu t0,t0,t1 # get the end of memory address
la t0, _stack_init # initialize stack so we
/* We must subtract 24 bytes for the 3 8 byte arguments to main, in
case main wants to write them back to the stack. The caller is
supposed to allocate stack space for parameters in registers in
@@ -154,73 +192,36 @@ zerobss:
Some ports need a larger alignment for the stack, so we subtract
32, which satisifes the stack for the arguments and keeps the
stack pointer better aligned. */
subu t0,t0,32 # and generate a starting stack-pointer
4:
subu t0,t0,32
move sp,t0 # set stack pointer
sw sp,__stackbase # keep this for future ref
.end zerobss
/*
* initialize target specific stuff. Only execute these
* functions it they exist.
*/
#if 0
.globl hardware_init_hook .text
.globl software_init_hook .text
.globl __do_global_dtors .text
.globl atexit .text
#endif
.globl exit .text
.globl init
.ent init
init:
#if 0
LA (t9, hardware_init_hook) # init the hardware if needed
beq t9,zero,6f
nop
jal t9
nop
6:
LA (t9, software_init_hook) # init the hardware if needed
beq t9,zero,7f
nop
jal t9
nop
7:
LA (a0, __do_global_dtors)
jal atexit
nop
#endif
#ifdef GCRT0
.globl _ftext
.globl _extext
LA (a0, _ftext)
LA (a1, _etext)
jal monstartup
nop
#endif
move a0,zero # set argc to 0
jal boot_card # call the program start function
nop
# fall through to the "exit" routine
jal exit # call libc exit to run the G++
jal _sys_exit # call libc exit to run the G++
# destructors
move a0,v0 # pass through the exit code
.end init
/*
* Exit from the application. Normally we cause a user trap
* to return to the ROM monitor for another run. NOTE: This is
* the only other routine we provide in the crt0.o object, since
* it may be tied to the "_start" routine. It also allows
* executables that contain a complete world to be linked with
* just the crt0.o object.
* _sys_exit -- Exit from the application. Normally we cause a user trap
* to return to the ROM monitor for another run. NOTE: This is
* the only other routine we provide in the crt0.o object, since
* it may be tied to the "_start" routine. It also allows
* executables that contain a complete world to be linked with
* just the crt0.o object.
*/
FRAME(_sys_exit,sp,0,ra)
.globl _sys_exit
.ent _sys_exit
_sys_exit:
7:
#ifdef GCRT0
jal _mcleanup
@@ -231,6 +232,44 @@ FRAME(_sys_exit,sp,0,ra)
nop
b 7b # but loop back just in-case
nop
ENDFRAME(_sys_exit)
.end _sys_exit
#define FRAME(name,frm_reg,offset,ret_reg) \
.globl name; \
.ent name; \
name:; \
.frame frm_reg,offset,ret_reg
#define ENDFRAME(name) \
.end name
FRAME(mips_enable_interrupts,sp,0,ra)
mfc0 t0,C0_SR /* get status reg */
nop
or t0,t0,a0
mtc0 t0,C0_SR /* save updated status reg */
j ra
nop
ENDFRAME(mips_enable_interrupts)
#define SR_IEC 0x00000001 /* cur interrupt enable, 1 => enable */
#define C0_SR $12 /* status register */
/*
FRAME(_CPU_ISR_Set_level,sp,0,ra)
nop
mfc0 t0,C0_SR
andi a0, SR_IEC
or t0, a0
mtc0 t0,C0_SR
nop
j ra
ENDFRAME(_CPU_ISR_Set_level)
*/
.section vectors
.align 2
FRAME(__ISR_MAIN,sp,0,ra)
ENDFRAME(__ISR_MAIN)
/* EOF crt0.S */

4
c/src/lib/libbsp/mips/genmongoosev/startup/bspstart.c
View File

@@ -19,6 +19,8 @@
#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/libcsupport.h>
#include <libcpu/mongoose-v.h>
/*
* The original table from the application and our copy of it with
@@ -69,6 +71,7 @@ void bsp_pretasking_hook(void)
#endif
}
/*
* bsp_start
@@ -92,6 +95,7 @@ void bsp_start( void )
BSP_Configuration.work_space_start = (void *) &WorkspaceBase;
MONGOOSEV_WRITE( MONGOOSEV_PERIPHERAL_FUNCTION_INTERRUPT_CAUSE_REGISTER, 0 );
mips_set_sr( 0xff00 ); /* all interrupts unmasked but globally off */
/* depend on the IRC to take care of things */
mips_install_isr_entries();