Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
tree: c76d4dbec0
Fetching contributors…

Cannot retrieve contributors at this time

file 61 lines (49 sloc) 1.204 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61
.global irq_entry
irq_entry:
/* Save user state */
msr CPSR_c, #0xDF /* System mode */

push {r7} /* Just like in syscall wrapper */
/* Load PIC status */
ldr r7, PIC
ldr r7, [r7]
PIC: .word 0x10140000
/* Most significant bit index */
clz r7, r7
sub r7, r7, #31

push {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}
mov r0, sp

msr CPSR_c, #0xD2 /* IRQ mode */
mrs ip, SPSR
sub lr, lr, #0x4 /* lr is address of next instruction */
stmfd r0!, {ip,lr}

msr CPSR_c, #0xD3 /* Supervisor mode */

/* Load kernel state */
pop {r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}
mov sp, ip
bx lr

.global svc_entry
svc_entry:
/* Save user state */
msr CPSR_c, #0xDF /* System mode */
push {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}
mov r0, sp
msr CPSR_c, #0xD3 /* Supervisor mode */

mrs ip, SPSR
stmfd r0!, {ip,lr}

/* Load kernel state */
pop {r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}
mov sp, ip
bx lr

.global activate
activate:
/* Save kernel state */
mov ip, sp
push {r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}

ldmfd r0!, {ip,lr}
msr SPSR, ip

msr CPSR_c, #0xDF /* System mode */
mov sp, r0
pop {r0,r1,r2,r3,r4,r5,r6,r7,r8,r9,r10,fp,ip,lr}
pop {r7}
msr CPSR_c, #0xD3 /* Supervisor mode */

movs pc, lr
Something went wrong with that request. Please try again.