android在armv4t中跑
16lz
2021-01-26
http://benno.id.au/blog/2007/11/21/android-neo1973通过这篇文章。决定使用处理未定义指令这种方式。因为最近学了驱动嘛。这是一个练手的机会。
有下面这些指令：（试试吧）
| Opcode | Desription | [PDF] Page Number | C | ASM |
|---|---|---|---|---|
| BLX(1) | Branch, Link, and Exchange | 166 | N/A (Unused in Android) | N/A (Unused in Android) |
| BLX(2) | Branch, Link, and Exchange | 168 | User:Cfriedt20081028 Remove from inline assembly with something like #ifdef HAVE_BLX ... (inline asm) ... #else ... (inline asm with equivalent blx code, as shown to the right) ... #endif | User:Cfriedt20081028 Substitute with a macro reference such as #ifdef HAVE_BLX #define BLX(a) / blx a #else #define BLX(a) / mov pc,lr / bx a #endif |
| CLZ | Count Leading Zeros | 175 | User:Cfriedt20081028 Remove from inline assembly with something like #ifdef HAVE_CLZ ... (inline asm) ... #else ... (inline asm with equivalent clz code, as shown to the right) ... #endif | User:Cfriedt20081029 #ifdef HAVE_CLZ #define CLZ(Rd,Rm) / clz Rd,Rm #else #define CLZ(Rd,Rm) / ... #endif ... CLZ(Rd,Rm) |
| LDRD | Load Registers Doubleword | 200 | User:Cfriedt20081028 Substitute different inline assembly code with something like #ifdef HAVE_LDRD ... (inline asm) ... #else ... (inline asm with ldrd substituted) ... #endif | User:Cfriedt20081028 Substitute with a macro reference such as #ifdef HAVE_LDRD #define LDRD(a,b) / ldrd a,b #else #define LDRD(a,b) / ... #endif |
| PLD | Preload Data | 240 | User:Cfriedt20081028 Remove from inline assembly with something like #ifdef HAVE_PLD ... (inline asm) ... #else ... (inline asm with pld removed) ... #endif | User:Cfriedt20081028 Remove or substitute with a macro reference such as #ifdef HAVE_PLD #define PLD(a,b) / pld a,b #else #define PLD(a,b) #endif ... PLD(r0,#0) |
| SMLA<x><y> | Signed Multiply-Accumulate | 291 | ||
| SMLAL<x><y> | Signed Multiply Accumulate Long | 298 | ||
| SMLAW<y> | Signed Multiply-Accumulate Word | 302 | ||
| SMUL<x><y> | Signed Multiply | 316 | ||
| SMULW<y> | Signed Multiply Word | 320 | ||
| QADD | Saturating Add | 242 | ||
| QDADD | Saturating Double and Add | 249 | ||
| QDSUB | Saturating Double and Subtract | 251 | ||
| QSUB | Saturating Subtract | 253 | ||
| STRD | Store Registers Doubleword | 349 | User:Cfriedt20081028 Substitute different inline assembly code with something like #ifdef HAVE_STRD ... (inline asm) ... #else ... (inline asm without strd) ... #endif |
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