diff options
| author | Christian Cunningham <cc@localhost> | 2022-01-22 23:18:22 -0700 |
|---|---|---|
| committer | Christian Cunningham <cc@localhost> | 2022-01-22 23:18:22 -0700 |
| commit | 3ace36ab03f40db05a7876013b7d814a3e5ca171 (patch) | |
| tree | a3961e767c4c6672134bac263e72c4047b45fef1 /src/boot.S | |
| parent | 9c0cb4e1f7df02f24751833b384963917bbf2360 (diff) | |
Added SVC call for clean stack
Diffstat (limited to 'src/boot.S')
| -rw-r--r-- | src/boot.S | 17 |
1 files changed, 14 insertions, 3 deletions
@@ -136,14 +136,25 @@ svc: // TODO: Make supervisor mode return to a specific location // (rather than to a user location) such as the kernel loop cmp r0, #0 - bne 2f + bne 3f cps #0x13 b 1f -2: +3: cmp r0, #2 - bne 1f + bne 2f ldmfd sp!, {r0-r12,lr} b schedule +2: + cmp r0, #3 + bne 1f + ldr r3, =scheduler + ldr r2, [r3, #0] + ldr r1, [r2, #8] // sp_base + cmp r1, #-1 + beq 1f + ldr r3, =stacks_table + mov r0, #0 + strb r0, [r3, r1] 1: ldmfd sp!, {r0-r12,pc}^ io_halt_prefetch: |