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发表于 2017-4-21 14:50:51
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在 ARM 端 StarterWare 例程中 CMD 文件比 DSP 端多了这样一句# _6 B! @- o+ A0 `
/* 重新配置程序入口点 */9 ^# r0 N" i& p! D" D' U/ ^
-e Entry- /****************************************************************************/2 q8 Q: [1 x& p3 U# \& |
- /* */( [# ?* [! w+ k1 }2 u4 F
- /* OMAPL138 及 DSP C6748 内存空间分配定义 */2 j v+ |# ~7 f( o
- /* */
5 I/ T* a% L) x7 b - /* 2015年04月20日 */
7 H, L- W6 J$ _9 G - /* */: u$ m) s- K0 U
- /****************************************************************************/
% }) W0 s: b1 E: \# J - /* 堆栈 */5 N/ p; ]' y) l$ S8 `+ q# V$ N# F
- -stack 0x8000
W9 D! ?% g3 h4 F9 T3 | - -heap 0x2000, A3 c1 v% b9 ~: j
- . P0 P6 ]! J$ [/ r l u% i" W
- /* 重新配置程序入口点 */0 _+ L( K4 `! @; l/ F
- -e Entry9 v, n) x' l0 y* c* q7 |
- 5 v2 W+ b7 s1 P9 D- l T0 c
- MEMORY
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- #ifdef DSP_CORE
6 y) B2 U C. \8 u; r& U9 ] - /****************************************************************************/, H+ d6 e# x1 J( E% Q7 B
- /* */
6 w/ z% y X s; \: a; J+ L - /* DSP 专有内存区域 */" u- b; l& r v: f- f- O
- /* */; D8 E/ @7 z* E; }- }# o6 K
- /****************************************************************************/! _8 F( u& Z$ [
- DSPL2ROM o = 0x00700000 l = 0x00100000 /* 1MB L2 DSP 本地 ROM (DSP ROM Bootloader) */9 X5 N: k6 g( z* {3 E' C7 w( M, `
- DSPL2RAM o = 0x00800000 l = 0x00040000 /* 256kB L2 DSP 本地 RAM */& t5 ~ S0 q- I$ C8 @
- DSPL1PRAM o = 0x00E00000 l = 0x00008000 /* 32kB L1 DSP 本地程序 RAM */# |: e7 a3 J( y2 B- j
- DSPL1DRAM o = 0x00F00000 l = 0x00008000 /* 32kB L1 DSP 本地数据 RAM *// y8 {3 B7 \2 z/ g3 c2 G: Z7 z
- #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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# i( @8 x: r/ j( tOMAPL138_StarterWare_1_10_04_01\system_config\armv5\cgt\init.asm
# C% A& X8 o5 ?9 k+ [. }- ;******************************************************************************/ I x4 X" H( j
- ;
7 v8 d2 s3 i( r$ \5 q$ ~ - ; init.asm - Init code routines# h* I7 Z7 M! S7 A5 n( [3 H. f0 Y
- ;
! P+ \+ }% K# s( Z8 j - ; Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/, y1 h7 s- Q1 [# n/ L1 j
- ; All rights reserved.
+ J. [* o' @ ^ A8 {# H. Z1 X - ;( U, ?5 m$ l; r! ~) i* ]' f: `+ }
- ;******************************************************************************) A6 L' t) O" }- o
- ;****************************** Global Symbols*******************************
) K4 l# m% j W1 i5 V - .global Entry
2 V M5 S+ _+ ?/ i) r0 }2 { - .global start_boot- Q/ ]# s" ^6 b! x4 ^
- .global __TI_auto_init1 ~- n0 t1 a1 N" K' J
- 2 C& k0 q, x. _1 b& b* @6 I4 W
- .ref __stack( M' E% L7 U4 e
- .ref __STACK_END
+ e5 m, v- E" [6 g+ [2 c% D) ~ - .ref bss_start- I% m; {- ?" w8 N) e2 n, ]
- .ref bss_end( M8 g) o- R, A# }) r! d+ q0 v. m k
- .ref start_boot
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- ;************************ Internal Definitions ******************************
0 W2 j; ?% I2 H' D - ;
; p& W% i+ k. |8 f - ; Define the stack sizes for different modes. The user/system mode will use
2 o8 y8 n! E- _! ?3 z$ e0 ~5 P( W - ; the rest of the total stack size) g* \( ^$ |( e% c8 Q) o6 V: ~- u J* R
- ;* m1 t+ C; e) @) p- L5 o
- : C8 E9 w0 D9 r) w" }3 o+ l
- UND_STACK_SIZE .set 0x8' j5 \* Y$ R! q- D/ F! |! o
- ABT_STACK_SIZE .set 0x8" H' c8 x- K: D4 Y$ T% K' h
- FIQ_STACK_SIZE .set 0x8" G; m% E: o0 s! ?9 q* Q
- IRQ_STACK_SIZE .set 0x5006 p8 c/ u9 _% B2 e
- SVC_STACK_SIZE .set 0x8, N! a$ z3 s z, I4 |0 b+ M4 j4 @
- ; ~0 U |) c% k6 q5 A3 e' G
- ;: o3 A6 W6 M6 J1 B
- ; to set the mode bits in CPSR for different modes
* Q a+ Q0 l7 q& X( ~ - ;
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% w% ]8 @! ~$ a$ _4 j* [) C- MODE_USR .set 0x10
1 o5 s3 g3 R: U - MODE_FIQ .set 0x11
5 r: Z7 l: i8 S) t5 ?' a - MODE_IRQ .set 0x12
, n1 D& p0 M2 H - MODE_SVC .set 0x13% |7 I9 s9 C& O5 f' [, q
- MODE_ABT .set 0x17
) o& v" z" x7 `. g - MODE_UND .set 0x1B
$ o2 F. X, N" w, F' x1 F - MODE_SYS .set 0x1F. `# W2 t |- U9 H) Z6 l8 m
- * \6 E/ ~! p- K3 s- U8 c/ O# o
- I_F_BIT .set 0xC00 K) L' L& \) i- Q7 ^
]+ Z% o7 C& I% h0 z2 n/ Y- ;**************************** Code Seection ***********************************7 I. U$ n" R8 e* h* a' B
- .text
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* r/ Z* ~- R- Q e- ;
8 I. E2 j9 E* i, K: k0 e( N* _8 d - ; This code is assembled for ARM instructions9 ] l/ L, N* E7 E# }2 J% l% Q9 J) i. [+ w
- ;
! {% X( [& s( |! K U% w - .state32
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+ f0 z: X; k% Q7 b- ;******************************************************************************. Z8 m6 ?; a- C) A1 F4 i
- ;
, ?% J1 P* a- @' `4 d8 O - ;******************************************************************************
) h) @" M% g. |& y2 f. `2 O - ;' g @: z, o4 Q4 r, k
- ; The reset handler sets up the stack pointers for all the modes. The FIQ and
: g0 G# P: J6 X - ; IRQ shall be disabled during this. Then, clearthe BSS sections, switch to the7 F% A( Y/ o0 F* |. D( H
- ; main() function.( o* g0 G m( Q
- ;5 d( q; l, j, h0 D* d; o3 w8 C
- Entry:
# v: G; F' G) C9 ?1 U - ;) x1 R8 b( {% ]0 A
- ; Set up the Stack for Undefined mode
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- LDR r0, _stackptr ; Read and align the stack pointer
! @5 k& Y! o3 l( G# f7 y - SUB r0, r0, #8& z& P! E3 V# m: x$ r% i( p
- BIC r0, r0, #7
+ }# J) v6 c ^; c# K - MSR cpsr_c, #MODE_UND|I_F_BIT ; switch to undef mode, Q, z- Z1 J* I5 ]3 `- c; g
- MOV sp,r0 ; write the stack pointer
* z; `1 _' L- S3 w4 X" a$ ^+ J# ?1 a - SUB r0, r0, #UND_STACK_SIZE ; give stack space7 T" C$ T8 {- j
- ;
. F4 K6 v) i3 B: h9 {; O - ; Set up the Stack for abort mode/ o# j6 ?/ J6 X9 @
- ;
; R0 D* `, [& h7 `' d8 p - MSR cpsr_c, #MODE_ABT|I_F_BIT ; Change to abort mode
, n) R8 A u3 z5 A2 v+ u - MOV sp, r0 ; write the stack pointer7 v0 p1 C! n9 I: {' T
- SUB r0,r0, #ABT_STACK_SIZE ; give stack space2 K3 P$ V$ R D
- ;
l# ]8 Y) j: f4 `% f8 t5 g8 f - ; Set up the Stack for FIQ mode
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- MSR cpsr_c, #MODE_FIQ|I_F_BIT ; change to FIQ mode8 t' g: A* g {
- MOV sp,r0 ; write the stack pointer' {" p6 i* o2 e
- SUB r0,r0, #FIQ_STACK_SIZE ; give stack space
: B" b3 N) ~" d( s4 w& Q8 c - ;
, K3 d, W0 Q4 H b' g9 G2 z! p; S - ; Set up the Stack for IRQ mode1 H6 {* b8 K5 k$ `9 R: B+ K
- ;
, d; |2 v7 l) P - MSR cpsr_c, #MODE_IRQ|I_F_BIT ; change to IRQ mode5 z: l8 O( U, r; U% c) [+ t
- MOV sp,r0 ; write the stack pointer. I9 w6 u* ^2 t) ?' Y8 m
- SUB r0,r0, #IRQ_STACK_SIZE ; give stack space
' Q; S3 U; N$ Z& X2 q `6 q# v - ;1 x, i8 ?6 W3 G* _3 } T
- ; Set up the Stack for SVC mode
1 r/ u$ l$ i, N7 A7 U4 N9 V1 | - ;
6 L! t. r! C+ Q5 b; Y - MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode! k, O+ Z u5 U2 o9 W# m
- MOV sp,r0 ; write the stack pointer, p) P9 r' g6 i1 I% K
- SUB r0,r0, #SVC_STACK_SIZE ; give stack space; J+ w+ b# p5 |& p: d" |$ P; a
- ;
" A( C# b @6 X3 W2 d1 \5 S8 n - ; Set up the Stack for USer/System mode" D) V; ?7 s/ @; Q/ E' Q& E
- ;9 N8 W7 t w( Z+ Z5 L
- MSR cpsr_c, #MODE_SYS|I_F_BIT ; change to system mode
; w* m4 G& O- r& x8 @! i! j - MOV sp,r0 ; write the stack pointer
; v# H- s" X& g% ~. ~ - 7 I6 H1 J W4 X% e6 n9 i
- ;
* B6 W8 k" S m6 F; w: }9 e% z& a - ; Clear the BSS section here
0 l: K' B; H# A& F1 Z! l - ;
! M$ u& K) E' F0 P - Clear_Bss_Section:7 q3 B' `- s/ ]& G' s
- / u" [' C6 _! ~5 m0 j8 }) T
- LDR r0, _bss_start ; Start address of BSS
K3 @2 c0 L% [8 c' M! C- a& a) }6 x - LDR r1, _bss_end ; End address of BSS
3 D0 e* l d, _ J7 _- a( ?( L - SUB r1,r1,#42 c4 |0 F* n' F2 Z0 C3 `9 [- B
- MOV r2, #0
/ h9 a! l, e& K% Y - Loop:# [: q4 Y( l2 E4 Q' @6 q
- STR r2, [r0], #4 ; Clear one word in BSS
j" k7 W! n7 c2 E( F, B2 S - CMP r0, r1
& P$ `1 z: [) `7 X - BLE Loop ; Clear till BSS end
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- BL __TI_auto_init ; Call TI auto init
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0 \% `3 y5 z" l& u0 O" T6 [- ;
9 w. D$ x1 l" P. z - ; Enter the start_boot function. The execution still happens in system mode& H! P \) W& x* B0 I; A0 x
- ;
$ K4 C$ x/ t; ~ J. b% X& t& Q - LDR r10, _start_boot ; Get the address of start_boot
' b/ k2 t0 M$ P- w: s I3 a- L - MOV lr,pc ; Dummy return
5 Z+ G7 F" r) k. ~3 L6 d - BX r10 ; Branch to start_boot
* _+ }- p1 h ]$ p" c - SUB pc, pc, #0x08 ; looping
! R' y1 k0 ]! L' r% ?- t - * t0 d- X7 w" @
- ; MSR cpsr_c, #MODE_SVC|I_F_BIT ; change to SVC mode
+ \. l3 w; @/ ~' {( [8 f: ` - ; BX lr
- ~) u @5 P3 y' w; K$ n8 s - ;
5 j. i) |! @$ g9 |3 W; i1 d - ; End of the file8 ?: C) w g5 C5 s. m1 J
- ;
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- _stackptr:0 Q0 T% m1 W- j
- .word __STACK_END
" V! r8 U5 B9 o - _bss_start:
8 I: c% u' |0 I - .word bss_start& K- A8 R- ] a, c: a
- _bss_end:
! z* [, a% r* d' E( g - .word bss_end* \6 Z9 C- m# O% E
- _start_boot:
4 d9 I( m. F) h5 t) ? - .word start_boot% p, `/ Q3 A: }3 ?
- _data_auto_init:
2 H4 D4 J- _9 t( g J' Y- g6 x - .word __TI_auto_init
; X0 b+ ~. s, u) x! X) z/ `# D8 Y - .end
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复制代码
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