URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_AT91FR40008_GCC/] [boot.s] - Blame information for rev 834

Go to most recent revision | Details | Compare with Previous | View Log


        /* Sample initialization file */
 
        .extern main
        .extern exit
 
        .text
        .code 32
 
 
        .align  0
 
        .extern __bss_beg__
        .extern __bss_end__
        .extern __stack_end__
        .extern __data_beg__
        .extern __data_end__
        .extern __data+beg_src__
 
        .global start
        .global endless_loop
 
        /* Stack Sizes */
    .set  UND_STACK_SIZE, 0x00000004
    .set  ABT_STACK_SIZE, 0x00000004
    .set  FIQ_STACK_SIZE, 0x00000004
    .set  IRQ_STACK_SIZE, 0X00000400
    .set  SVC_STACK_SIZE, 0x00000400
 
        /* Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs */
    .set  MODE_USR, 0x10            /* User Mode */
    .set  MODE_FIQ, 0x11            /* FIQ Mode */
    .set  MODE_IRQ, 0x12            /* IRQ Mode */
    .set  MODE_SVC, 0x13            /* Supervisor Mode */
    .set  MODE_ABT, 0x17            /* Abort Mode */
    .set  MODE_UND, 0x1B            /* Undefined Mode */
    .set  MODE_SYS, 0x1F            /* System Mode */
 
    .equ  I_BIT, 0x80               /* when I bit is set, IRQ is disabled */
    .equ  F_BIT, 0x40               /* when F bit is set, FIQ is disabled */
 
 
start:
_start:
_mainCRTStartup:
 
        /* Setup a stack for each mode - note that this only sets up a usable stack
        for system/user, SWI and IRQ modes.   Also each mode is setup with
        interrupts initially disabled. */
    ldr   r0, .LC6
    msr   CPSR_c, #MODE_UND|I_BIT|F_BIT /* Undefined Instruction Mode */
    mov   sp, r0
    sub   r0, r0, #UND_STACK_SIZE
    msr   CPSR_c, #MODE_ABT|I_BIT|F_BIT /* Abort Mode */
    mov   sp, r0
    sub   r0, r0, #ABT_STACK_SIZE
    msr   CPSR_c, #MODE_FIQ|I_BIT|F_BIT /* FIQ Mode */
    mov   sp, r0
    sub   r0, r0, #FIQ_STACK_SIZE
    msr   CPSR_c, #MODE_IRQ|I_BIT|F_BIT /* IRQ Mode */
    mov   sp, r0
    sub   r0, r0, #IRQ_STACK_SIZE
    msr   CPSR_c, #MODE_SVC|I_BIT|F_BIT /* Supervisor Mode */
    mov   sp, r0
    sub   r0, r0, #SVC_STACK_SIZE
    msr   CPSR_c, #MODE_SYS|I_BIT|F_BIT /* System Mode */
    mov   sp, r0
 
        /* We want to start in supervisor mode.  Operation will switch to system
        mode when the first task starts. */
        msr   CPSR_c, #MODE_SVC|I_BIT|F_BIT
 
        /* Clear BSS. */
 
        mov     a2, #0                   /* Fill value */
        mov             fp, a2                  /* Null frame pointer */
        mov             r7, a2                  /* Null frame pointer for Thumb */
 
        ldr             r1, .LC1                /* Start of memory block */
        ldr             r3, .LC2                /* End of memory block */
        subs    r3, r3, r1      /* Length of block */
        beq             .end_clear_loop
        mov             r2, #0
 
.clear_loop:
        strb    r2, [r1], #1
        subs    r3, r3, #1
        bgt             .clear_loop
 
.end_clear_loop:
 
        /* Initialise data. */
 
        ldr             r1, .LC3                /* Start of memory block */
        ldr             r2, .LC4                /* End of memory block */
        ldr             r3, .LC5
        subs    r3, r3, r1              /* Length of block */
        beq             .end_set_loop
 
.set_loop:
        ldrb    r4, [r2], #1
        strb    r4, [r1], #1
        subs    r3, r3, #1
        bgt             .set_loop
 
.end_set_loop:
 
        mov             r0, #0          /* no arguments  */
        mov             r1, #0          /* no argv either */
 
        bl              main
 
endless_loop:
        b               endless_loop
 
 
        .align 0
 
        .LC1:
        .word   __bss_beg__
        .LC2:
        .word   __bss_end__
        .LC3:
        .word   __data_beg__
        .LC4:
        .word   __data_beg_src__
        .LC5:
        .word   __data_end__
        .LC6:
        .word   __stack_end__
 
 
        /* Setup vector table.  Note that undf, pabt, dabt, fiq just execute
        a null loop. */
 
.section .startup,"ax"
         .code 32
         .align 0
 
        b     _start                                            /* reset - _start                       */
        ldr   pc, _undf                                         /* undefined - _undf            */
        ldr   pc, _swi                                          /* SWI - _swi                           */
        ldr   pc, _pabt                                         /* program abort - _pabt        */
        ldr   pc, _dabt                                         /* data abort - _dabt           */
        nop                                                                     /* reserved                                     */
        ldr   pc, [pc,#-0xF20]                          /* IRQ - read the AIC           */
        ldr   pc, _fiq                                          /* FIQ - _fiq                           */
 
_undf:  .word __undf                    /* undefined                            */
_swi:   .word vPortYieldProcessor       /* SWI                                          */
_pabt:  .word __pabt                    /* program abort                        */
_dabt:  .word __dabt                    /* data abort                           */
_fiq:   .word __fiq                     /* FIQ                                          */
 
__undf: b     .                         /* undefined                            */
__pabt: b     .                         /* program abort                        */
__dabt: b     .                         /* data abort                           */
__fiq:  b     .                         /* FIQ                                          */

Line No.	Rev	Author	Line
1	577	jeremybenn	`/* Sample initialization file */`
2
3			`.extern main`
4			`.extern exit`
5
6			`.text`
7			`.code 32`
8
9
10			`.align 0`
11
12			`.extern __bss_beg__`
13			`.extern __bss_end__`
14			`.extern __stack_end__`
15			`.extern __data_beg__`
16			`.extern __data_end__`
17			`.extern __data+beg_src__`
18
19			`.global start`
20			`.global endless_loop`
21
22			`/* Stack Sizes */`
23			`.set UND_STACK_SIZE, 0x00000004`
24			`.set ABT_STACK_SIZE, 0x00000004`
25			`.set FIQ_STACK_SIZE, 0x00000004`
26			`.set IRQ_STACK_SIZE, 0X00000400`
27			`.set SVC_STACK_SIZE, 0x00000400`
28
29			`/* Standard definitions of Mode bits and Interrupt (I & F) flags in PSRs */`
30			`.set MODE_USR, 0x10 /* User Mode */`
31			`.set MODE_FIQ, 0x11 /* FIQ Mode */`
32			`.set MODE_IRQ, 0x12 /* IRQ Mode */`
33			`.set MODE_SVC, 0x13 /* Supervisor Mode */`
34			`.set MODE_ABT, 0x17 /* Abort Mode */`
35			`.set MODE_UND, 0x1B /* Undefined Mode */`
36			`.set MODE_SYS, 0x1F /* System Mode */`
37
38			`.equ I_BIT, 0x80 /* when I bit is set, IRQ is disabled */`
39			`.equ F_BIT, 0x40 /* when F bit is set, FIQ is disabled */`
40
41
42			`start:`
43			`_start:`
44			`_mainCRTStartup:`
45
46			`/* Setup a stack for each mode - note that this only sets up a usable stack`
47			`for system/user, SWI and IRQ modes. Also each mode is setup with`
48			`interrupts initially disabled. */`
49			`ldr r0, .LC6`
50			`msr CPSR_c, #MODE_UND\|I_BIT\|F_BIT /* Undefined Instruction Mode */`
51			`mov sp, r0`
52			`sub r0, r0, #UND_STACK_SIZE`
53			`msr CPSR_c, #MODE_ABT\|I_BIT\|F_BIT /* Abort Mode */`
54			`mov sp, r0`
55			`sub r0, r0, #ABT_STACK_SIZE`
56			`msr CPSR_c, #MODE_FIQ\|I_BIT\|F_BIT /* FIQ Mode */`
57			`mov sp, r0`
58			`sub r0, r0, #FIQ_STACK_SIZE`
59			`msr CPSR_c, #MODE_IRQ\|I_BIT\|F_BIT /* IRQ Mode */`
60			`mov sp, r0`
61			`sub r0, r0, #IRQ_STACK_SIZE`
62			`msr CPSR_c, #MODE_SVC\|I_BIT\|F_BIT /* Supervisor Mode */`
63			`mov sp, r0`
64			`sub r0, r0, #SVC_STACK_SIZE`
65			`msr CPSR_c, #MODE_SYS\|I_BIT\|F_BIT /* System Mode */`
66			`mov sp, r0`
67
68			`/* We want to start in supervisor mode. Operation will switch to system`
69			`mode when the first task starts. */`
70			`msr CPSR_c, #MODE_SVC\|I_BIT\|F_BIT`
71
72			`/* Clear BSS. */`
73
74			`mov a2, #0 /* Fill value */`
75			`mov fp, a2 /* Null frame pointer */`
76			`mov r7, a2 /* Null frame pointer for Thumb */`
77
78			`ldr r1, .LC1 /* Start of memory block */`
79			`ldr r3, .LC2 /* End of memory block */`
80			`subs r3, r3, r1 /* Length of block */`
81			`beq .end_clear_loop`
82			`mov r2, #0`
83
84			`.clear_loop:`
85			`strb r2, [r1], #1`
86			`subs r3, r3, #1`
87			`bgt .clear_loop`
88
89			`.end_clear_loop:`
90
91			`/* Initialise data. */`
92
93			`ldr r1, .LC3 /* Start of memory block */`
94			`ldr r2, .LC4 /* End of memory block */`
95			`ldr r3, .LC5`
96			`subs r3, r3, r1 /* Length of block */`
97			`beq .end_set_loop`
98
99			`.set_loop:`
100			`ldrb r4, [r2], #1`
101			`strb r4, [r1], #1`
102			`subs r3, r3, #1`
103			`bgt .set_loop`
104
105			`.end_set_loop:`
106
107			`mov r0, #0 /* no arguments */`
108			`mov r1, #0 /* no argv either */`
109
110			`bl main`
111
112			`endless_loop:`
113			`b endless_loop`
114
115
116			`.align 0`
117
118			`.LC1:`
119			`.word __bss_beg__`
120			`.LC2:`
121			`.word __bss_end__`
122			`.LC3:`
123			`.word __data_beg__`
124			`.LC4:`
125			`.word __data_beg_src__`
126			`.LC5:`
127			`.word __data_end__`
128			`.LC6:`
129			`.word __stack_end__`
130
131
132			`/* Setup vector table. Note that undf, pabt, dabt, fiq just execute`
133			`a null loop. */`
134
135			`.section .startup,"ax"`
136			`.code 32`
137			`.align 0`
138
139			`b _start /* reset - _start */`
140			`ldr pc, _undf /* undefined - _undf */`
141			`ldr pc, _swi /* SWI - _swi */`
142			`ldr pc, _pabt /* program abort - _pabt */`
143			`ldr pc, _dabt /* data abort - _dabt */`
144			`nop /* reserved */`
145			`ldr pc, [pc,#-0xF20] /* IRQ - read the AIC */`
146			`ldr pc, _fiq /* FIQ - _fiq */`
147
148			`_undf: .word __undf /* undefined */`
149			`_swi: .word vPortYieldProcessor /* SWI */`
150			`_pabt: .word __pabt /* program abort */`
151			`_dabt: .word __dabt /* data abort */`
152			`_fiq: .word __fiq /* FIQ */`
153
154			`__undf: b . /* undefined */`
155			`__pabt: b . /* program abort */`
156			`__dabt: b . /* data abort */`
157			`__fiq: b . /* FIQ */`

Browse

Tools

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [ARM7_AT91FR40008_GCC/] [boot.s] - Blame information for rev 834