diff options
| author | Christian Cunningham <cc@localhost> | 2022-02-01 20:36:30 -0700 |
|---|---|---|
| committer | Christian Cunningham <cc@localhost> | 2022-02-01 20:36:30 -0700 |
| commit | 7d3884b5cfc282dbdfe5d9a22d8b2b343280b8af (patch) | |
| tree | a3e5e5376c35cce48d1e2d907720646448c5e2ba /src/exceptions | |
| parent | 98793badc1c1d3e4bfd735fdecd3d2d731701ab3 (diff) | |
Thread yield control to any other threads
Diffstat (limited to 'src/exceptions')
| -rw-r--r-- | src/exceptions/svc.S | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/src/exceptions/svc.S b/src/exceptions/svc.S index 51c6479..7e6a327 100644 --- a/src/exceptions/svc.S +++ b/src/exceptions/svc.S @@ -12,12 +12,13 @@ svc: beq svc_000002 cmp r0, #1 beq svc_000001 - cmp r0, #1 + cmp r0, #0 beq svc_000000 svc_000000: - cps #0x13 - b svc_exit -svc_000001: + bl yield + ldmfd sp!, {r0-r12,lr} + b schedule +svc_000001: // Get time mov r2, #0x3004 movt r2, #0x3F00 ldr r0, [r2, #4] // <- SYS_TIMER_CLO @@ -25,10 +26,10 @@ svc_000001: str r0, [sp] // Return value str r1, [sp, #4] // Return value hi b svc_exit -svc_000002: +svc_000002: // Run Schedule ldmfd sp!, {r0-r12,lr} b schedule -svc_000003: +svc_000003: // Clean task stack ldr r3, =scheduler ldr r2, [r3, #0] // struct Thread* rthread ldr r1, [r2, #8] // sp_base |