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! ^; v9 n1 w7 z4 W2 |在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
3 F! a4 h# q1 E8 z/* 重新配置程序入口点 */$ H5 N; c1 x# Y" {+ C/ D0 g" H
-e Entry- /****************************************************************************/
- h E% z' @' U/ Q6 v6 u3 l- L - /* */: [! ?3 i) ^& @+ G) G9 B. `
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */
. x# H* Q4 r0 V }9 c" h. d - /* */+ i% U( D/ M8 x' v/ k
- /* 2015年04月20日 */. X, v6 C+ G! T; `8 }2 a* D/ a8 m
- /* */$ e2 h" l4 P# w2 t* v5 [4 G
- /****************************************************************************/+ S# E: ]; g1 {
- /* 堆栈 */# y# B$ s2 M! s' p) S. n- f
- -stack 0x8000/ x+ l$ s+ f, T/ C
- -heap 0x2000
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8 S) b! ~: s& M. w% ~/ C- /* 重新配置程序入口点 */
8 B/ S/ f9 {0 b$ r; p - -e Entry
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8 d* I: s3 U# `2 j$ x- MEMORY5 }& `7 e) }" P8 b; S4 O
- {( z% H- H' b9 u- Y" A0 X# B l
- #ifdef DSP_CORE
7 q i9 s- n8 Y& H4 x - /****************************************************************************/4 E1 e. R$ T9 M/ D$ D) r# R
- /* */
+ q: ~/ K' N1 _% Z - /* DSP 专有内存区域 */. T; A( V* a4 J$ ?1 `
- /* */
2 Y0 p/ N3 | _" j - /****************************************************************************/
* a* d4 b# a5 j0 H4 j - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */- x: _! `2 F+ W2 q
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */9 [- ~: z' m/ r. c7 g
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */: R) p/ r/ A& u) k0 [
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */. [9 S% |+ g6 m6 j$ y# A
- #endif
复制代码 这是一段汇编代码用于切换到特权模式
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OMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm6 K! L, f4 X5 e: V4 ~/ j' m
- ;******************************************************************************* z' j$ W) {9 |! r# j1 l- T7 ^
- ;
& u& v0 F( ?4 d( D6 v f- C - ; init.asm - Init code routines
2 @9 w- Z0 {5 q+ W! w# j- Z - ;
5 I( g0 F& r2 p0 u$ T7 _ - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
$ l2 }9 [- e$ A# S - ; All rights reserved.
, {* V: [: ~2 t) U3 A% W( r+ L - ;
' s( Y# y' P5 g" B ~, A - ;******************************************************************************3 C+ c0 e9 I: d. R2 M; @2 {
- ;****************************** Global Symbols*******************************
! N. J; i7 v6 Q - .global Entry
; B3 T+ Y( C$ g4 Q - .global start_boot
/ d: m. _# w/ t M - .global __TI_auto_init5 o# w3 ]) n3 q& y- i
- R5 T6 z9 E% |- .ref __stack
0 |& v- s I# t# p. J9 F, K0 m - .ref __STACK_END" x* ]7 P' D2 Q
- .ref bss_start$ f5 d0 T3 K4 o6 n9 r4 o6 G
- .ref bss_end
$ b) D- I* R& h, }7 y+ Y - .ref start_boot) r* p s8 s+ k$ D, N' }
- + X. Y: h" Y/ M9 H2 u: V, w
- ;************************ Internal Definitions ******************************
! p* V; K9 s) P6 s5 E. K - ;- H4 l5 c6 J* p$ W5 N* A; J5 m
- ; Define the stack sizes for different modes. The user/system mode will use
: \0 r J( N2 o( \! l, `2 o$ Z - ; the rest of the total stack size" D7 |. P6 u/ c4 M: O; }1 E* X2 l
- ;$ r I* I( l" L8 L: Y( K& Y1 E
! g1 C1 C: k$ W1 z4 P h- _0 g- UND_STACK_SIZE .set 0x87 c9 o- }# o( ~
- ABT_STACK_SIZE .set 0x8- h ~5 T4 c+ ]; c& m" e; J
- FIQ_STACK_SIZE .set 0x8% ~* L; s% F3 z, A4 m4 m
- IRQ_STACK_SIZE .set 0x500% U+ }" p7 O, o% V- }* o, U
- SVC_STACK_SIZE .set 0x8 o8 S+ |; K4 T) V1 M+ x: n
0 j- R, s8 r$ C2 q& S- D- a- ;
; `* c7 k4 q- ]3 O' [( `* { - ; to set the mode bits in CPSR for different modes
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- 9 Q" W( C2 j" W) [/ N
- MODE_USR .set 0x10
, h( C. a5 Q, g0 j - MODE_FIQ .set 0x11
) _8 w3 j! C C" L - MODE_IRQ .set 0x12
; q8 W8 N8 K4 I1 h! M& I6 D - MODE_SVC .set 0x133 P2 o7 |7 c, _8 {
- MODE_ABT .set 0x17& _( e: j: q$ o, U0 S' N
- MODE_UND .set 0x1B( s4 d1 p: }. L# X$ ], }& O
- MODE_SYS .set 0x1F# S/ T; {6 _, S8 C
( Z$ d( G. u. }/ K# |0 s) Y- I_F_BIT .set 0xC0! z* m& @* {5 D4 q( }* p9 n
+ X+ p4 d! {* C* z/ e9 g5 G! [- ;**************************** Code Seection ***********************************
7 h+ l: k6 p) H I6 o$ G8 b - .text* S6 c3 b e$ r3 \* @6 V; M- @' H
- + M$ F/ e: M$ [- W, n
- ;) m+ l/ `' c3 X, P
- ; This code is assembled for ARM instructions7 B, W0 \3 N7 L" x' a3 ]1 o: a
- ;5 m/ a8 i9 q. P2 Q
- .state32+ E% ~: P2 s- l/ [/ a' J: C$ h- A
- ]* [9 e& u! p% G- O- ;******************************************************************************5 q4 A& h4 R, G$ k" ^1 @, h/ }4 a9 R- v3 N
- ;
; b8 c5 ]4 M6 ]; ]% [6 @" { - ;******************************************************************************
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- ; The reset handler sets up the stack pointers for all the modes. The FIQ and3 d6 M0 U3 F$ R: G% @8 w
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the4 R; o; Q) v) j5 f. v
- ; main() function.
- _1 Q' S t5 |. @ - ;
/ d% h+ @% T3 @! \5 S1 Q! \( Z$ j+ Y) Q - Entry:1 s$ d6 _2 Z4 i9 q2 T9 C% z
- ;
( I# L; o" G( ?* {& J7 D2 o - ; Set up the Stack for Undefined mode) W0 E- L4 Z; A5 L
- ;4 f! y+ k1 P& ~; o9 W: F
- LDR r0, _stackptr ; Read and align the stack pointer J, M/ d' Z: D1 D5 Y% S9 |9 F
- SUB r0, r0, #82 R- h& P7 d: x) N8 ^2 V! i& {
- BIC r0, r0, #7/ p% `& P8 m. J5 M: i! l/ X
- MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode- L3 E0 ?* t2 N0 G7 e3 p* O% R
- MOV sp,r0 ; write the stack pointer
1 `' z+ e: I+ [+ D) x) b1 _ - SUB r0, r0, #UND_STACK_SIZE ; give stack space
; R! o3 h! n; ~2 L2 J - ;
' L$ `$ b8 i$ k, n - ; Set up the Stack for abort mode$ B# Z/ F1 m M3 p6 h
- ;
& `. c! }! M- P8 K7 u - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode' ]' }' t& B/ m. F
- MOV sp, r0 ; write the stack pointer: }3 `, L& W: Z! ]8 d5 p7 \+ j3 _& A' x
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space
+ ?7 S$ x/ v+ n - ;
" q" G8 Y$ U" k. e6 [$ O2 }4 ] - ; Set up the Stack for FIQ mode) @! O! h1 m! I/ ~
- ;0 p2 {$ J2 g8 b- u- @
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode# X6 f" H, f2 d9 B" v
- MOV sp,r0 ; write the stack pointer5 ?: V- X/ a1 N, S+ P4 o
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space5 c7 q! g! T+ H h i' K
- ;9 Y9 V+ ^3 c1 o' B9 g" X6 }8 w
- ; Set up the Stack for IRQ mode4 u; a) x4 z! o* c4 C
- ;
. { J; u L1 H3 { b4 R - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
0 v/ d: J' v y' t- S+ |# Q - MOV sp,r0 ; write the stack pointer
) B ?* W6 O* L4 b# t4 x/ G9 e$ V - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space0 t- h$ K/ R/ R
- ;5 T# R0 ?; Y: J& \/ |
- ; Set up the Stack for SVC mode* E M3 Q9 {4 ~8 R# n4 d' h
- ;
( H% r0 H4 }7 o2 W - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode9 G2 g" ~' H3 o+ K4 C
- MOV sp,r0 ; write the stack pointer7 t7 c2 }( J, d/ _9 F( p) h4 G
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
: E4 G% x0 Q* z/ {9 B - ;% _) E. ]2 w9 N) u U* A
- ; Set up the Stack for USer/System mode
- Z3 m M$ [0 Y - ;* |- N6 A+ p& ^* l/ z3 m' w3 J
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
% _7 j) D0 L, F5 w8 }% t - MOV sp,r0 ; write the stack pointer" g% e( K: Y8 `1 M6 O+ W, c, L1 p
! a+ ?, {/ P' ? D- ;% w6 Y, l5 q' e# f3 u) f. L3 R+ F
- ; Clear the BSS section here `! W+ @2 A3 y0 b" F! ~, d; O9 N
- ;: I* k6 {5 Z; x3 ?3 U* N7 {
- Clear_Bss_Section:* ^1 x* b/ u9 R' k8 e
- * w: x/ G& ` n) `& u3 e
- LDR r0, _bss_start ; Start address of BSS% x4 l2 z2 r2 y+ W' l
- LDR r1, _bss_end ; End address of BSS
" k% A5 }1 ^ Q - SUB r1,r1,#4
9 f% P5 {# N$ S' O - MOV r2, #0
6 O2 d2 I% ]! O6 {% G - Loop:7 p( ], E% j* U; C
- STR r2, [r0], #4 ; Clear one word in BSS' A+ v' I2 Y5 b" _8 a" X3 r
- CMP r0, r1* l( U9 P% T, u5 R- y; e
- BLE Loop ; Clear till BSS end
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- BL __TI_auto_init ; Call TI auto init p8 @# x. T6 W9 B& f
- - u, T- F3 T, Q9 C9 z% h# M
- ;
7 [" t' b; j2 ?1 A- i% p - ; Enter the start_boot function. The execution still happens in system mode
' {3 s2 p. a7 M6 y$ ?! H7 M7 G" k. G - ;
" h7 y8 \+ t7 i0 V4 H1 M' Y - LDR r10, _start_boot ; Get the address of start_boot
* l/ M1 h6 ~3 C6 `! _6 _& R - MOV lr,pc ; Dummy return 7 Z N; P: Q; p- w9 r
- BX r10 ; Branch to start_boot4 R4 k0 G. i3 j3 I' L# U
- SUB pc, pc, #0x08 ; looping$ O( m/ l( z& c- [* h! g
" ~ r0 _/ {6 C+ P- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
! i" A7 v6 _6 _ - ; BX lr' r- B2 C8 L! ^) ^
- ;: o* r: d3 j# F2 z, r" C: s R/ Z$ U6 k
- ; End of the file# _, T! o L* j/ V+ F6 p
- ;- G$ M, y+ J q3 ^
- F) B0 r4 h5 }" t
- _stackptr:; {* I' Y/ U8 V' i( @
- .word __STACK_END! f( I) I: C* H0 K) x' W
- _bss_start:6 t0 m, \" B% M+ Z
- .word bss_start7 ?! X. s8 a: z% k
- _bss_end:
; Q1 C3 P& ?! S& ^ - .word bss_end
: o0 A! k+ \6 O9 \8 a) h$ y - _start_boot:
4 Q. \0 r: E& u6 e# L: w; `. y - .word start_boot7 h9 k$ r4 D: U
- _data_auto_init:; o4 C1 H- q! F( U! N+ a5 t% ^
- .word __TI_auto_init# Q, [6 b' \0 H! F* `. { j ~9 W$ C
- .end4 d, ^8 g \, v9 k% D: Y5 i0 U
- 7 G8 ^* ^$ Q- X# A7 K
- 3 @. @- p' m" t1 A5 T
- 1 e/ R$ u& u6 B; d+ q2 T# o' |
复制代码 - V: h4 k6 R( r: g; l# W
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