+.global __cp_begin
+.hidden __cp_begin
+.global __cp_end
+.hidden __cp_end
+.global __cp_cancel
+.hidden __cp_cancel
+.hidden __cancel
+.global __syscall_cp_asm
+.hidden __syscall_cp_asm
+
#r0: volatile. may be modified during linkage.
#r1: stack frame: 16 byte alignment.
#r2: tls/thread pointer on pp32
#the fields CR2,CR2,CR4 of the cond reg must be preserved
#LR (link reg) shall contain the funcs return address
.text
- .global __syscall_cp_asm
.type __syscall_cp_asm,%function
__syscall_cp_asm:
# at enter: r3 = pointer to self->cancel, r4: syscall no, r5: first arg, r6: 2nd, r7: 3rd, r8: 4th, r9: 5th, r10: 6th
- .global __cp_begin
__cp_begin:
# r3 holds first argument, its a pointer to self->cancel.
# we must compare the dereferenced value with 0 and jump to __cancel if its not
cmpwi cr7, 0, 0 #compare r0 with 0, store result in cr7.
beq+ cr7, 1f #jump to label 1 if r0 was 0
- b __cancel #else call cancel
- # (the return address is not needed, since __cancel never returns)
+ b __cp_cancel #else call cancel
1:
#ok, the cancel flag was not set
# syscall: number goes to r0, the rest 3-8
mr 7, 9 # arg5
mr 8, 10 # arg6
sc
- .global __cp_end
__cp_end:
bnslr+ # return if no summary overflow.
#else negate result.
neg 3, 3
blr
+__cp_cancel:
+ b __cancel