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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句
" Z5 d( v& `! {' s A/* 重新配置程序入口点 */
1 Q* g* Q+ `5 x; i5 r* B-e Entry- /****************************************************************************/& s7 c8 a5 ]' w* ^
- /* */ A. Z; {( B9 z! ?: M% I0 W
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */* f0 H( ?1 S0 L8 S
- /* */
; C' b- C$ j3 } - /* 2015年04月20日 */
% l: S7 T8 W" t. ^8 S - /* */
1 f1 Z( F2 g; j8 R. O - /****************************************************************************/
* c" P5 L8 |# v4 c+ K8 R# \ - /* 堆栈 */0 Q+ q9 s/ M( G4 x+ U* u
- -stack 0x8000
& [* `+ V0 D, @ - -heap 0x2000
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; I& m. J0 M- ~. j: w# @( N- /* 重新配置程序入口点 */( w; u" I6 N: L0 E: t( @% x
- -e Entry
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# _" c3 p% T5 Q, J( I' H- MEMORY- }$ T+ w9 z* A/ d6 v
- {5 r5 ?6 E8 x4 @ G$ C5 f
- #ifdef DSP_CORE* B3 c- K- e6 I1 `
- /****************************************************************************/
# H! G0 T0 M5 @0 n. c - /* */0 O' F7 k, @3 i& J* \* J
- /* DSP 专有内存区域 */
( X- B g- f/ L7 j9 W) a9 j7 h u. y2 p - /* */
4 \* q9 M) V. e$ B2 u - /****************************************************************************/
9 T1 t# J+ T N# d4 c* I; O - DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */0 x# r3 W P* L% S
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */- o5 ^9 R1 | j# z% O8 k C- Y
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */ n$ x0 k9 I5 ]' {6 S1 x1 `
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM */
5 s/ }1 x% j. k4 {: W6 L7 ^1 N - #endif
复制代码 这是一段汇编代码用于切换到特权模式( M, `6 E2 Y3 S+ g
4 i) j2 D( ~3 o: M9 TOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
( A$ t# K- Z6 w2 I% ?( a5 e1 `8 S, H( U- ;******************************************************************************- |% J( e% f, g: c9 a5 l+ f5 J5 z
- ; w3 ?3 n; v: \3 _& s' a
- ; init.asm - Init code routines) f, b3 U: U- p8 @8 r+ m) e; p
- ;
" D7 r. ]+ K5 Z) ?, s; G% n - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/: `7 l- t, `. ^! S' O
- ; All rights reserved.+ A& ^8 C+ b6 H5 v; U
- ;' h7 \) V+ m2 X' }! p& c& S
- ;******************************************************************************2 d" I7 Y0 N8 x+ U' q+ ]2 m! i4 d
- ;****************************** Global Symbols*******************************
9 X" b; e6 D; s& U" `$ r, H - .global Entry+ ^5 g) ~0 ^( o# t0 s$ `; z# y
- .global start_boot
9 D% |7 r8 f$ f' ~+ P - .global __TI_auto_init) I% h* m( ]( j2 R; E N( s' U/ b; I
% d6 l O3 @ S7 C& L9 w- .ref __stack4 E0 T: K0 C* d* m
- .ref __STACK_END% \! B- X- ^6 j5 z+ h
- .ref bss_start& W# m$ W- d1 w# s; i. z
- .ref bss_end- J6 e& M+ d' `- `* R2 b
- .ref start_boot3 @: L: j& X7 t& W
5 W8 ?' j3 v% y, I* c- ;************************ Internal Definitions ******************************
S3 n% ?/ W% Q3 n5 b. [ - ;/ \3 c( p1 v: c0 ^% e/ }* t
- ; Define the stack sizes for different modes. The user/system mode will use
$ W/ i# O1 _; H2 j* n& V - ; the rest of the total stack size- l2 p1 i" R B/ L6 r* f: p
- ; G+ S- i1 {7 S- A7 s; c' p3 m
+ u# b3 y+ J& I9 ~4 U$ l5 F- UND_STACK_SIZE .set 0x8
1 e6 c$ u3 p0 R% K, f - ABT_STACK_SIZE .set 0x8
}! O3 Y$ ~) z0 x - FIQ_STACK_SIZE .set 0x8' S& C D9 }3 B0 N# k% ]# ]
- IRQ_STACK_SIZE .set 0x500
" v, D) I% d4 A- H0 Q! S - SVC_STACK_SIZE .set 0x8
]% c$ X7 k( R0 c9 B* p0 H* p9 S
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- ; to set the mode bits in CPSR for different modes2 i5 _6 J! c, s9 R/ V2 f
- ;+ Q! X. d8 @/ L% w
D: b; I4 R+ ^0 j+ {8 q- MODE_USR .set 0x10
% I+ ~ [! S9 |( _/ Q9 F; x4 t - MODE_FIQ .set 0x11% q# f5 Z1 f5 q( d
- MODE_IRQ .set 0x12' P2 Q6 b4 A4 C3 d
- MODE_SVC .set 0x13
" J4 Q! z, v h% w: O - MODE_ABT .set 0x171 O- G! {9 |$ n
- MODE_UND .set 0x1B
: d; ?2 q* J% Z0 B - MODE_SYS .set 0x1F
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% P# y" N' D9 } a1 g- I_F_BIT .set 0xC0
- k" n$ W0 H |- t - ; }5 f3 g' T# D- M- o4 X+ A# N+ |
- ;**************************** Code Seection ***********************************
( @ q% f) _5 y" O( V& \8 B - .text5 T' v f# j2 M6 Z
- 2 q7 e& T4 X, v- H. X! _- U
- ;$ |6 S; Q& z |
- ; This code is assembled for ARM instructions: I: f7 T6 {$ Q8 ]9 X
- ;
9 {3 { Z$ X+ C - .state32
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" G. F; n; |4 w9 ]- ;******************************************************************************
9 _9 T( j. P/ ?& j( V+ [, e1 l - ;
6 G2 S: ^3 T' Q3 i/ w0 B - ;******************************************************************************2 ~8 v8 W8 Y) A4 O
- ;
, H$ d- m, R; b1 l, e! {4 E - ; The reset handler sets up the stack pointers for all the modes. The FIQ and" ^# K% }8 M5 X. a) T1 w2 i
- ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the7 d' I" j$ B/ B" K$ k; a
- ; main() function.
- K, r; Y9 Y& c6 i6 m - ;
- q7 H; Y6 Z5 y - Entry:6 |* P( e8 V0 h$ D2 q
- ;
' A+ T# L6 a! Q- f: h' N& C8 f) x - ; Set up the Stack for Undefined mode8 W2 f N$ @7 s
- ;
) h7 B3 ~# s k6 J$ l! R; B - LDR r0, _stackptr ; Read and align the stack pointer
' s/ d6 X* U1 b$ L \; q) U7 v - SUB r0, r0, #8% \! X( D- G2 Y* A* l2 Y+ W1 i
- BIC r0, r0, #7
+ Y. o% a( R6 e) P# n - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode5 G# @5 |7 R Q, x
- MOV sp,r0 ; write the stack pointer
: S4 B" u/ }( Z- u& Z# B% M: W& |& D - SUB r0, r0, #UND_STACK_SIZE ; give stack space
8 }, c2 G0 S9 I: B1 g( c% t - ;. `4 p7 @2 ^) u$ M
- ; Set up the Stack for abort mode0 P' u" i$ E# @5 Z( g) m& ^
- ;" @& s6 n6 V; V. n1 J. E8 A
- MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode. j1 a0 x+ D, ~* t
- MOV sp, r0 ; write the stack pointer
( X$ H* o' j3 ] - SUB r0,r0, #ABT_STACK_SIZE ; give stack space8 @- {# H& D) k2 P1 Y! Y! p! }1 u
- ;( \7 A; i1 L- \8 O: s m( q
- ; Set up the Stack for FIQ mode% ~2 h: E! r; s; {) X
- ;, v/ X4 ~4 k1 { p( @
- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode$ @% J% T3 T N- ]# q7 j
- MOV sp,r0 ; write the stack pointer
- a+ r* t! v7 `5 {! u' z8 k; S - SUB r0,r0, #FIQ_STACK_SIZE ; give stack space, ~- x5 ~) H5 L" l
- ;+ P' x8 I, c4 \; E2 Y' i9 I
- ; Set up the Stack for IRQ mode6 @: @$ C- R6 T7 v, h* P1 |
- ;. v$ |* s3 \; d* I! Y% o
- MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode
! [2 N; ~8 P0 A. @2 G- m - MOV sp,r0 ; write the stack pointer
% p/ d9 f- x% K7 E+ t3 M - SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
9 w ` k9 `& q8 ^( V5 Q! [ - ;# j% T4 \, f* H3 a) C, R& K( r5 r) K! N
- ; Set up the Stack for SVC mode. q" I, d5 b/ X) i* o4 O
- ;
! l! P- Q- V2 A- w2 [ - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
; Z3 z" R% U; o) A$ @0 {9 t - MOV sp,r0 ; write the stack pointer3 o* ?$ Y. x0 K0 Y% B- [
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space
- n, z4 ^' @* R+ x - ;" k+ h3 p. C% l+ d, ^" u
- ; Set up the Stack for USer/System mode
4 R3 H; f( r' {* ?7 e8 X& w - ;
0 D, s3 B7 w; ?; f - MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode1 @ i7 ^/ S& m( U% D
- MOV sp,r0 ; write the stack pointer
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- ;
. P9 `) x# y; Q r - ; Clear the BSS section here
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- Clear_Bss_Section:
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& p* q7 j9 A9 m3 B, Y- LDR r0, _bss_start ; Start address of BSS9 B9 _; a8 A6 Y1 I0 I8 d v
- LDR r1, _bss_end ; End address of BSS
8 u" D, n: ]0 J$ |. w - SUB r1,r1,#4$ L1 z- T4 M! m1 M Y( O
- MOV r2, #0
+ ~2 E1 [, v, N4 j- l% a& {# Y - Loop:/ K9 Z$ Z5 _& ]; X* ~, E5 _
- STR r2, [r0], #4 ; Clear one word in BSS8 R& H* w: f# U$ p& h# @9 I( r% s$ S
- CMP r0, r1
# k; K9 ?" N+ C* a0 g - BLE Loop ; Clear till BSS end
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- BL __TI_auto_init ; Call TI auto init$ T3 B: k! G/ i# g' }" u3 T: p
- ! i" G- F/ Q d9 e+ `0 n
- ;
. F7 M8 F* S @; a% B, \0 Z - ; Enter the start_boot function. The execution still happens in system mode. I9 _1 c7 [$ y/ `$ b9 } D
- ;
2 d8 E1 [. J" \' E9 [+ E% C - LDR r10, _start_boot ; Get the address of start_boot2 i3 T2 q- `0 f" I' ?
- MOV lr,pc ; Dummy return 5 j! [9 b7 u' S1 N
- BX r10 ; Branch to start_boot
! b- Z* n9 b" d, c( S/ _6 H5 K3 T - SUB pc, pc, #0x08 ; looping& a! G3 X; l) l9 f9 C
- 8 P! Y; f/ l" U
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
- ^5 m: L0 i5 Z0 K/ A - ; BX lr
* U. V! W X6 Y* ? - ;
4 i6 u, J3 |/ | ]5 c5 V0 U) Z N/ m - ; End of the file
% m5 p n/ z7 H$ q& s" e - ;
# c" K1 }5 d, D) @
: G! x; F6 `8 `$ f" `/ i; w6 @- _stackptr:2 n0 N! C6 j" `
- .word __STACK_END
" y8 w2 Y ?8 u - _bss_start:- U0 c: z1 C; k8 t& d
- .word bss_start# z4 y1 w2 G! ~' k
- _bss_end:& T Y, N* j9 d d* }
- .word bss_end
, W" t/ ?* o9 v. z* Q2 d - _start_boot:
7 b( D2 Z1 j* ?- g% f3 H - .word start_boot* _ f- q: t. R/ B
- _data_auto_init:
8 H( \( p0 ]% o' i9 N" |/ E - .word __TI_auto_init
% c- k" J n6 d+ P/ y5 m0 i - .end
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复制代码
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