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arm: thumb understanding++

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Ciro Santilli 六四事件 法轮功
2019-05-30 00:00:01 +00:00
parent ceadb1d776
commit 1f55dec44c
8 changed files with 140 additions and 41 deletions
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1
userland/arch/arm/freestanding/linux/hello.S
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@@ -6,7 +6,6 @@
.text
.global _start
_start:
asm_main_after_prologue:
/* write */
mov r0, 1 /* stdout */
adr r1, msg /* buffer */

22
userland/arch/arm/freestanding/linux/hello_thumb.S Normal file
View File

@@ -0,0 +1,22 @@
/* https://github.com/cirosantilli/linux-kernel-module-cheat#arm-thumb-encoding */
.thumb_func
.syntax unified
.text
.global _start
_start:
asm_main_after_prologue:
/* write */
mov r0, 1 /* stdout */
adr r1, msg /* buffer */
ldr r2, =len /* len */
mov r7, 4 /* syscall number */
svc 0
/* exit */
mov r0, 0 /* exit status */
mov r7, 1 /* syscall number */
svc 0
msg:
.ascii "hello\n"
len = . - msg