kmips
所属分类：嵌入式/单片机/硬件编程
开发工具：kotlin
文件大小：0KB
下载次数：0
上传日期：2022-03-25 18:02:07
上 传 者：
sh-1993
说明： 用于组装小型代码修补程序的MIPS汇编程序，
(MIPS assembler intended for assembling small code patches,)
文件列表:
.editorconfig (232, 2022-03-25)
CHANGES.md (726, 2022-03-25)
LICENSE (10173, 2022-03-25)
build.gradle (1825, 2022-03-25)
gradle/ (0, 2022-03-25)
gradle/wrapper/ (0, 2022-03-25)
gradle/wrapper/gradle-wrapper.jar (59821, 2022-03-25)
gradle/wrapper/gradle-wrapper.properties (202, 2022-03-25)
gradlew (8070, 2022-03-25)
gradlew.bat (2674, 2022-03-25)
settings.gradle (27, 2022-03-25)
src/ (0, 2022-03-25)
src/main/ (0, 2022-03-25)
src/main/kotlin/ (0, 2022-03-25)
src/main/kotlin/kmips/ (0, 2022-03-25)
src/main/kotlin/kmips/Assembler.kt (21652, 2022-03-25)
src/test/ (0, 2022-03-25)
src/test/kotlin/ (0, 2022-03-25)
src/test/kotlin/kmips/ (0, 2022-03-25)
src/test/kotlin/kmips/AssemblerTest.kt (17145, 2022-03-25)
kmips
-----
kmips is a MIPS assembler that is invoked directly from Kotlin code. It implements MIPS II instruction set, including FPU
(coprocessor 1) instructions. The main purpose of kmips is to provide simple way of writing code patches for compiled
executables. It was successfully used in few fan translations and game modding projects.
kmips is available from the Maven Central repository:
```groovy
compile "com.kotcrab.kmips:kmips:1.6"
```
##### Example code
Assemble some instruction to fill 32 bytes of memory at address 0x08804100 with incrementing value
```kotlin
import kmips.Label
import kmips.Reg.*
import kmips.assemble
assemble(startPc = 0x8804000) {
val loop = Label()
val target = 0x08804100
val bytes = 32
la(s0, target) // write target address
li(t1, 0) // loop counter
li(t2, bytes) // how many bytes to write
label(loop) // 'loop' label will be placed here
sb(t1, 0, s0) // store byte in memory at register s0 with offset 0
addiu(t1, t1, 1) // increment loop counter
addiu(s0, s0, 1) // increment memory address pointer
bne(t1, t2, loop) // jump to `loop` branch if not equal
nop() // ignoring branch delay slot for example simplicity
}
```
Result of running the assembled code:
```
0x08804100: 00 01 02 03 | 04 05 06 07 | 08 09 0A 0B | 0C 0D 0E 0F
0x08804110: 10 11 12 13 | 14 15 16 17 | 18 19 1A 1B | 1C 1D 1E 1F
```
Specifying `startPc` (initial program counter) is necessary for calculating address of branch and jump instructions.
Alternatively to `assemble` which returns a `List` you can also use `assembleAsHexString` or
`assembleAsByteArray`. In any case, the result is ready to be written into the target executable. If you're executable is
relocatable you might also need to manually update relocation table.
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