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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
: I$ `7 M' Z" Q8 h8 m* e/* 重新配置程序入口点 */
( l4 o, `1 b. ?-e Entry- /****************************************************************************/* X, F+ q: C( {8 O$ C8 U8 ]
- /* */
, f; z$ ^9 {3 T# y+ f% l - /* OMAPL138 及 DSP C6748 内存空间分配定义 */
z' K4 @2 {8 X! k: r - /* */
/ _& o* x! d5 v# ^4 D; T, K - /* 2015年04月20日 */
& T2 x3 ?8 B, V" f0 q2 ^# Y' | - /* */
- m- j) ]* f2 S" }3 \ C$ F - /****************************************************************************/
! I( s' d2 C7 v/ W3 l+ g/ w1 S - /* 堆栈 */0 [' Z1 i3 c% M- w3 H/ h) c/ a
- -stack 0x8000
0 B) J* @* X, j- H - -heap 0x20001 z" Y1 Y: n* S1 v
- 1 D! b9 ?7 M! p- @
- /* 重新配置程序入口点 */
( }, G9 v+ Y0 Q3 h5 n0 z - -e Entry! o4 F( L/ ]; n6 H* G
- 0 O0 J. p5 t2 I. x
- MEMORY/ h6 O3 X- r9 B; M7 Z0 j; M
- {
: r' ?. S+ j7 Y9 G9 m; u' R - #ifdef DSP_CORE
8 w9 y8 U8 f# c. r, G! J# p - /****************************************************************************/
3 ~/ I% G! t3 K+ D7 T) `& U - /* */4 z5 u' ]9 Q, I! L1 ]( A
- /* DSP 专有内存区域 */
6 C+ T$ }2 y% Y1 y1 o' K9 T& ^) O - /* */; c9 | E* O8 f
- /****************************************************************************/
8 Q5 c( x! [, v. _9 d7 t - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */
4 ^( Y7 p7 O; q( u; i( H5 [2 A - DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */
, J$ y/ K- a- f - DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */0 O7 A8 J+ d) V2 @4 Y( c1 V L
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
, z( s$ j _ [9 Z/ |, Y - #endif
复制代码 这是一段汇编代码用于切换到特权模式6 \+ ]- J) F, t# _# f
. u, e5 {, d/ j, ^6 L8 c6 FOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
# `. D$ ]! M/ `" f2 @5 t- ;******************************************************************************5 ?& T8 l: ?! a3 L
- ;
% A n# d$ v* y9 W& Q - ; init.asm - Init code routines3 F7 N+ W- R/ g5 F7 ^; ]* m
- ;( \0 n% P- g# k, ]) z% i1 N
- ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/2 F8 Q6 O* i6 I4 } W$ O1 B4 S
- ; All rights reserved.1 }* d) W. r" o0 i4 w
- ;$ P- g' Q" v% n
- ;******************************************************************************
9 C8 W8 J2 L" L- a& p% \ - ;****************************** Global Symbols*******************************. _ e# F) o; L' o7 ]. V+ e: g: D
- .global Entry
& c& K1 T8 |4 V5 D \ - .global start_boot3 c) f" V6 w; x. z
- .global __TI_auto_init' ]; y0 P, S& e5 ^4 N K
5 `4 V$ Z: J7 Q% _& O1 u2 m- .ref __stack
" t* w( N7 n' _ }2 _. x. l: r - .ref __STACK_END
# n4 w- x9 j* p - .ref bss_start/ ], z# R0 T- {7 X3 n5 i8 G9 ^
- .ref bss_end) P$ \6 F" q1 { c6 x
- .ref start_boot9 a0 O+ J1 Z6 g# z$ n
- ! G, w5 ]+ d6 R' V$ I
- ;************************ Internal Definitions ******************************: q7 m+ u7 b; l% J
- ;3 r1 m2 ?& X3 ^9 K
- ; Define the stack sizes for different modes. The user/system mode will use$ k w1 O+ t* s8 H
- ; the rest of the total stack size
- V8 T$ s4 _. H - ;
3 C* ?+ N& F7 X: Q. b - " R# k% E5 b7 V) ]$ c
- UND_STACK_SIZE .set 0x8$ @- d4 x0 S: I* P
- ABT_STACK_SIZE .set 0x8
, [. l- Y6 B$ _2 ^ - FIQ_STACK_SIZE .set 0x8 V7 s' x. C- a4 O
- IRQ_STACK_SIZE .set 0x500
4 G- O! y5 m9 { - SVC_STACK_SIZE .set 0x8# w2 ~8 N! K7 b( F# Q7 b
1 q/ X2 X; @- y' u- ;
' B# t. I) t, o: O" W# u - ; to set the mode bits in CPSR for different modes
' ~' L+ f: H9 y# G* Y7 p9 S - ;& T9 v4 D, v( g: t- [" p. }
n; C4 ]: _( n) B7 g1 \2 E; \, L- MODE_USR .set 0x10
9 D( N, J8 l/ @ - MODE_FIQ .set 0x11
1 s6 L! Y' d% W& T7 z- P/ i - MODE_IRQ .set 0x12- L |$ |2 v3 i) Z1 S7 [ h
- MODE_SVC .set 0x138 }' T* E2 z& x+ y/ N* ?: r
- MODE_ABT .set 0x17
6 I% v# G3 S; ~% d8 c+ x1 T k - MODE_UND .set 0x1B; q. ?! k8 \# i& w7 i) a0 l% _
- MODE_SYS .set 0x1F+ A( s' C0 ]7 r: X/ C8 O- d
% `% H8 u5 Q/ f$ j, R5 a4 z- I_F_BIT .set 0xC0
+ v* ?4 x8 m( c4 K* C8 q0 Q$ N
3 h7 @) {: z7 J7 Y1 @- ;**************************** Code Seection ***********************************
, c; G8 Z( `( l - .text' J a( Q) j) W: T* G o9 Q! R
- * {; G+ {/ g' V8 X' h5 i* e
- ;
4 l9 i l% D7 a) E# Z - ; This code is assembled for ARM instructions
* v" Y4 `6 R6 }; I* E4 w - ;4 ]7 I" Z9 s7 p+ S
- .state32
& j2 h7 t9 U7 r1 ?: M7 c1 y' C
- [! N# x! o) j' u. z) S" T- ;******************************************************************************0 _" D; [# L! l$ a; j% u% x, ^
- ;
7 g( b3 \0 S! v: v2 y7 I - ;******************************************************************************
u+ N1 Y4 o8 e - ;
. {: {; ]# L& e - ; The reset handler sets up the stack pointers for all the modes. The FIQ and+ U' z+ _% G" i
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the
' `# a1 e! |9 j" C - ; main() function.
* G/ c" `% |; d' w& j - ;1 ~, p3 n# x% }. o5 x9 v; L
- Entry:# w; N& `8 v7 @4 ^+ H8 G
- ;7 I B% C& M3 e
- ; Set up the Stack for Undefined mode
9 I$ d8 e# i" J - ;
' C+ `% F* X B) E' K" l - LDR r0, _stackptr ; Read and align the stack pointer7 j' b- d) K o& P& z/ j
- SUB r0, r0, #81 K# E% Z( {0 b) G
- BIC r0, r0, #7
: ?* C8 l* m* s _5 r0 f - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode+ R( j: R+ V7 @1 ?3 p+ d; S
- MOV sp,r0 ; write the stack pointer7 p% E9 E3 o5 S6 u- H
- SUB r0, r0, #UND_STACK_SIZE ; give stack space
; s6 H g9 j$ y) k" ] - ;) t" A2 s* u ?
- ; Set up the Stack for abort mode
) o1 s0 j# y. N! f7 `3 i- W - ;
" H% B; e1 [8 e+ @2 G) ~* G3 E - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode3 O- i! d0 @+ i2 U4 e8 s& [+ i' }
- MOV sp, r0 ; write the stack pointer
/ N9 X# L0 }# r f - SUB r0,r0, #ABT_STACK_SIZE ; give stack space
2 n/ d: o7 K3 v* Y' }8 ~! N - ;
2 |- p4 `9 n" m" `' }* q - ; Set up the Stack for FIQ mode
* L% W) M6 T: z! Y* a) O7 T: L - ; k6 a9 F; i, n& T9 d( e+ Y& H
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode5 o6 T0 I6 B2 v' h" S# J
- MOV sp,r0 ; write the stack pointer
# f1 L- r$ O* Y6 |+ R/ ^8 H - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space2 ~; P; h/ d: B: T! N* h
- ;
; N$ {0 U, F1 r) h - ; Set up the Stack for IRQ mode, F, a$ ?5 I0 Z# ~/ h% f9 @
- ;
, }( ?2 \( t) E7 h0 Y8 `! [6 r/ ?' F - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode: w# e$ w( b- _( k. N" {, f
- MOV sp,r0 ; write the stack pointer
' r9 U2 o4 @, t6 O - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
" H, K9 F$ [* E$ P0 n4 R3 f7 U - ;
2 Q8 g- j: t" P$ ]; y2 N4 F; V - ; Set up the Stack for SVC mode% p# }/ [8 \. ]$ P# x9 W
- ;! r; M$ h5 [+ e9 ]5 ^$ n. m
- MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode/ J, ~' C- Z3 e" ~
- MOV sp,r0 ; write the stack pointer
3 E7 F4 o3 @ w4 Q; H - SUB r0,r0, #SVC_STACK_SIZE ; give stack space7 s' W7 P8 a) L& v; y$ A4 b# X
- ;
2 ?; J( y# h, V. {$ } - ; Set up the Stack for USer/System mode/ w. h; J" m8 V
- ;
+ s/ e; P8 |* j; f- J. O8 m - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode8 N9 B, e0 x% o/ S3 ~
- MOV sp,r0 ; write the stack pointer
4 C2 S6 O q! w
6 R/ P* X: j/ `) o9 _# Z- ;
2 Z |) v3 E% z; V$ t - ; Clear the BSS section here* P6 _ `3 L2 O& m% d8 @1 d
- ;: z* Q$ P' P( @* u2 G
- Clear_Bss_Section:
{; ~3 L$ d" d; w9 {- l- y5 ?
: t9 f: u: B5 c8 d- LDR r0, _bss_start ; Start address of BSS
5 l; [4 s9 @4 H2 K( O; l. M6 Y - LDR r1, _bss_end ; End address of BSS/ E* Y7 i3 T& W* g5 I( i
- SUB r1,r1,#43 F' F. q6 N" N
- MOV r2, #0
+ i' W5 H7 {" h- h4 @% G9 C - Loop:
( K* W$ u# y, V @; M9 O0 k - STR r2, [r0], #4 ; Clear one word in BSS
^7 C3 q3 R- g; @ - CMP r0, r1! ?9 X g9 d! Z" E1 d
- BLE Loop ; Clear till BSS end
! m0 o* {( t4 |! o; D - 7 g0 s# [1 p7 H4 p
- BL __TI_auto_init ; Call TI auto init6 b/ L- @! A d) g/ L
) y: C6 S% k7 p! E; p- ;
& b/ [2 q( I' a X: D# p# \* R# ^0 n - ; Enter the start_boot function. The execution still happens in system mode, }- n: f$ R9 y! e( ~
- ;; g+ ~: R3 H* b' i |
- LDR r10, _start_boot ; Get the address of start_boot; z( R+ A4 v- Z! r* w; J) I9 ^ M: `
- MOV lr,pc ; Dummy return
' g, x- T9 ~/ K/ C# D3 h3 Z - BX r10 ; Branch to start_boot
J5 W3 Y% b- `$ e" Q - SUB pc, pc, #0x08 ; looping; B2 {% K4 }( s
- ~$ h9 G% @! _% f
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode+ ~! Y; u/ M* C. a2 y& L
- ; BX lr
- i; C! }$ t0 [3 J. a; `. |% u - ;
- R- f1 [# D) n6 r; J3 R - ; End of the file3 c- ]3 P, r8 _7 m5 W8 d
- ;
3 c1 i% X" _$ {& T# W - - }- s7 t3 H0 v
- _stackptr:$ ]) `$ ^7 m. U# c% Y8 q/ t& K2 p
- .word __STACK_END
- r; U# o$ r C - _bss_start:
$ b+ B, m+ B, v6 ]5 _: P - .word bss_start
- n$ {* y* X, }. Q7 P3 o - _bss_end:
- a9 _2 F9 t+ Q! M9 Q( y - .word bss_end0 v7 l: o: _$ k" y
- _start_boot:7 ^7 \* b$ Y7 p8 y; d
- .word start_boot2 j) U" S1 o- \0 q- ]1 K
- _data_auto_init:$ q6 a v4 W N7 E
- .word __TI_auto_init
) c0 K5 s$ y$ Q1 M$ @7 V. A - .end
7 ^, V1 S# G8 V! N7 ~, B - 6 G$ {8 s) n) T4 x
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% c" O0 _0 P& H3 [" P- O
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