Mercurial > hg > Members > innparusu > xv6-rpi
comparison src/entry-clang.S @ 13:f28daf1e47c1
clang-arm
| author | mir3636 |
|---|---|
| date | Fri, 16 Feb 2018 17:44:49 +0900 |
| parents | src/entry.S@ad95e7f82f1e |
| children |
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| 12:ad95e7f82f1e | 13:f28daf1e47c1 |
|---|---|
| 1 #include "arm.h" | |
| 2 #include "memlayout.h" | |
| 3 | |
| 4 .text | |
| 5 .code 32 | |
| 6 | |
| 7 .global _start | |
| 8 | |
| 9 _start: | |
| 10 # clear the entry bss section, the svc stack, and kernel page table | |
| 11 LDR r1, =edata_entry | |
| 12 LDR r2, =end_entry | |
| 13 MOV r3, #0x00 | |
| 14 | |
| 15 1: | |
| 16 CMP r1, r2 | |
| 17 # STMLTIA r1!, {r3} | |
| 18 STMIALT r1!, {r3} | |
| 19 BLT 1b | |
| 20 | |
| 21 # initialize stack pointers for svc modes | |
| 22 MSR CPSR_cxsf, #(SVC_MODE|NO_INT) | |
| 23 LDR sp, =svc_stktop | |
| 24 | |
| 25 BL start | |
| 26 B . | |
| 27 | |
| 28 # during startup, kernel stack uses user address, now switch it to kernel addr | |
| 29 .global jump_stack | |
| 30 jump_stack: | |
| 31 MOV r0, sp | |
| 32 ADD r0, r0, #KERNBASE | |
| 33 MOV sp, r0 | |
| 34 MOV pc, lr |