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C for DSP56800E
User Stack Allocation
122
Targeting MC56F83xx/DSP5685x Controllers
In cases where the SP is modified by a run-time dependent amount, a warning is
issued.
Listing 6.1 Example 1 – Legal modification of SP Using Inline Assembly
#define EnterCritical() { asm(adda #2,SP);\
asm(move.l SR,X:(SP)+); \
asm(bfset #0x0300,SR); \
asm(nop); \
asm(nop);}
#define ExitCritical() { asm(deca.l SP);\
a sm(m o v e.l x : (SP) - , SR) ; \
asm(nop);\
asm(nop);}
#pragma check_inline_sp_effects on
int func()
{
int a=1, b=1, c;
EnterCritical();
C = a+b;
ExitCritical();
}
This case will work because there are no control flow merge points. SP is modified
consistently along all paths from the beginning to the end of the function and is
properly aligned.
Listing 6.2 Example 2 – Illegal Modification of SP using Inline Assembly
#define EnterCritical() { asm(adda #2,SP);\
asm(move.l SR,X:(SP)+); \
asm(bfset #0x0300,SR); \
asm(nop); \
asm(nop);}
#define ExitCritical() { asm(deca.l SP);\
a sm(m o v e.l x : (SP) - , SR) ; \
- Revised 2003/08/15 1
- How to Contact Metrowerks 2
- Table of Contents 3
- 6 C for DSP56800E 113 4
- 8 Debugging for DSP56800E 189 5
- A Porting Issues 353 7
- Introduction 10
- CodeWarrior IDE 10
- References 11
- Getting Started 13
- Creating a Project 15
- Project Wizard 16
- Finish dialog box (Figure 19
- 2.4) appears 19
- Stationery 21
- Development Studio 29
- Overview 29
- Development Process 30
- Manage Files (1) 31
- Project Files 32
- Editing Code 33
- Development Studio Overview 34
- Debugging 36
- Target Settings 37
- Changing Target Settings 39
- XML Files 41
- Restoring Target Settings 41
- C/C++ Language 45
- Element Purpose Comments 47
- C/C++ Preprocessor 48
- Table 4.6 49
- C/C++ Warnings 50
- M56800E Assembler 54
- M56800E Processor 56
- ELF Disassembler 59
- M56800E Linker 61
- Remote Debugging 66
- M56800E Target (Debugging) 67
- Remote Debug Options 71
- Processor Expert Overview 76
- Processor Expert Beans 78
- Processor Expert Menu 79
- Item Subitem Action 80
- Processor Expert Windows 83
- Bean Inspector 84
- Target CPU Window 86
- Memory Map Window 91
- CPU Types Overview 92
- Resource Meter 93
- Installed Beans Overview 94
- Peripherals Usage Inspector 95
- Processor Expert Interface 100
- Processor Expert Tutorial 100
- IRQA and 101
- GPIO_C0. The 101
- Listing 5.1 File Events.c 105
- C for DSP56800E 113
- Type Option Setting Size 114
- Passing Values to Functions 115
- Stack Frame and Alignment 119
- User Stack Allocation 120
- , b, or c may not be correct 123
- Data Alignment Requirements 125
- Word and Byte Pointers 126
- Code and Data Storage 127
- Large Data Model Support 129
- Optimizing Code 132
- Deadstripping and Link Order 133
- Deadstripping and Link Order 134
- Inline Assembly Language 135
- Inline Assembly Overview 136
- Assembly Language Quick Guide 137
- Language 140
- Intrinsic Functions 141
- Fractional Arithmetic 142
- Absolute/Negate 145
- L_negate 146
- Addition/Subtraction 147
- Deposit/Extract 153
- L_deposit_h 154
- L_deposit_l 154
- Division 155
- Multiplication/MAC 158
- L_mult_ls 163
- Normalization 164
- Rounding 167
- Shifting 168
- L_shlftNs 174
- L_shlfts 175
- L_shrtNs 177
- __mod_init 179
- __mod_initint16 180
- __mod_start 180
- __mod_access 181
- __mod_update 181
- __mod_stop 181
- __mod_getint16 182
- __mod_setint16 182
- Modulo Buffer Examples 183
- Points to Remember 185
- Modulo Addressing Error Codes 186
- Function Possible Error Code 187
- Code Meaning 187
- Debugging for DSP56800E 189
- Command Converter Server 190
- Converter Server 191
- Protocol to Parallel Port 191
- Protocol to PCI 194
- 1. Click the Add button 195
- Load/Save Memory 197
- History Combo Box 198
- Radio Buttons 199
- Memory Type Combo Box 199
- Address Text Field 199
- Size Text Field 199
- Dialog Box Controls 199
- Fill Memory 200
- Fill Expression Text Field 201
- Save/Restore Registers 202
- Register Group List 203
- EOnCE Debugger Features 204
- Special Counters 205
- Trace Buffer 207
- Set Trigger Panel 209
- Using the DSP56800E Simulator 211
- Cycle/Instruction Count 212
- Memory Map 213
- Setting Breakpoints 217
- Setting Watchpoints 218
- Register Details Window 220
- Viewing X: Memory 221
- Viewing P: Memory 223
- • Mixed (Figure 8.26 225
- Command-Line Debugging 227
- Command-Line Debugging Tasks 229
- View Debugging Command Hints 230
- Stop an Executing Script 231
- [func_name 233
- [ -rd 252
- [ id_num 252
- [ address filename 255
- [re]start 258
- System-Level Connect 264
- Debugging in the Flash Memory 265
- M56800E Target 268
- High-Speed Simultaneous 269
- Transfer 269
- Host-Side Client Interface 270
- HSST Host Program Example 276
- Target Library Interface 278
- HSST_setvbuf 279
- HSST_write 280
- HSST_read 281
- HSST_flush 282
- HSST_size 282
- HSST_raw_read 283
- HSST_raw_write 283
- HSST_set_log_dir 284
- HSST Target Program Example 285
- Figure 9.1 Restart HSST 286
- ELF Linker and Command 287
- Memory Segment 288
- Closure Blocks 288
- Sections Segment 289
- Linker Command File Syntax 290
- Arithmetic Operations 291
- Comments 291
- Deadstrip Prevention 292
- Expressions and Assignments 293
- Integral Types 293
- File Selection 294
- Function Selection 294
- ROM to RAM Copying 295
- Stack and Heap 297
- (location counter) 298
- ALIGNALL 300
- FORCE_ACTIVE 301
- KEEP_SECTION 302
- REF_INCLUDE 304
- SECTIONS 304
- WRITEB (expression); 307
- WRITEH (expression); 307
- WRITEW (expression); 308
- Response File 309
- Sample Build Script 310
- Arguments 310
- DSP56800E Command-Line Tools 311
- Compiler 312
- Assembler 323
- Libraries and Runtime 325
- Console and File I/O 326
- Host File Location 327
- DSP56800E 328
- Runtime Initialization 329
- Libraries and Runtime Code 331
- EOnCE Library 332
- _eonce_Initialize 334
- _eonce_SetTrigger 335
- _eonce_SetCounterTrigger 336
- _eonce_ClearTrigger 337
- _eonce_GetCounters 338
- _eonce_GetCounterStatus 338
- _eonce_SetupTraceBuffer 339
- _eonce_GetTraceBuffer 340
- _eonce_ClearTraceBuffer 340
- _eonce_StartTraceBuffer 341
- _eonce_HaltTraceBuffer 341
- _eonce_EnableDEBUGEV 342
- _eonce_EnableLimitTrigger 342
- Definitions 343
- Return Codes 344
- Normal Trigger Modes 344
- Counter Trigger Modes 346
- Data Selection Modes 347
- Counter Function Modes 348
- Normal Unit Action Options 348
- Counter Unit Action Options 349
- Accumulating Trigger Options 349
- Miscellaneous Trigger Options 350
- Trace Buffer Capture Options 351
- Trace Buffer Full Options 352
- Porting Issues 353
- DSP56800x New Project 355
- Stationery Wizard 355
- • Resulting Target Rules 356
- • Rule Notes 356
- Page Rules 357
- Resulting Target Rules 359
- Rule Notes 360
- New Project Dialog Box 362
- Target Pages 363
- Expert Option Page 366
- Expert Page 368
- “Page Rules.” 368
- Data Memory Model Page 369
- External/Internal Memory Page 370
- Finish Page 371
- Pragmas for the DSP56800 373
- Pragma Scope 374
- Pragma Reference 375
- ANSI_strict 376
- <istring> 382
- Optional Arguments: 382
- <ustring> 382
- <accmode> 382
- *str2 = 'Y'; 384
- #pragma inline_depth(n) 390
- #pragma inline_depth(smart) 390
- #pragma inline_max_size(n); 390
- Interrupt 396
- #pragma mark itemName 397
- #pragma mark 397
- #pragma mpwc_relax on 399
- #pragma notonce 400
- #pragma once [ on ] 400
- [...data..] 410
- #include "file" 419
- #include <file> 420
- Illegal Pragmas 432
- Checking Settings 432
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