Index: fusl/src/thread/powerpc/syscall_cp.s |
diff --git a/fusl/src/thread/powerpc/syscall_cp.s b/fusl/src/thread/powerpc/syscall_cp.s |
new file mode 100644 |
index 0000000000000000000000000000000000000000..77f8938dc8b7cbf3ad8ad9c283d0231e86c90b02 |
--- /dev/null |
+++ b/fusl/src/thread/powerpc/syscall_cp.s |
@@ -0,0 +1,59 @@ |
+.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 |
+#r3,r4: return values, first args |
+#r5-r10: args |
+#r11-r12: volatile. may be modified during linkage |
+#r13: "small data area" pointer |
+#r14 - r30: local vars |
+#r31: local or environment pointer |
+ |
+#r1, r14-31: belong to the caller, must be saved and restored |
+#r0, r3-r12, ctr, xer: volatile, not preserved |
+#r0,r11,r12: may be altered by cross-module call, |
+#"a func cannot depend on that these regs have the values placed by the caller" |
+ |
+#the fields CR2,CR2,CR4 of the cond reg must be preserved |
+#LR (link reg) shall contain the funcs return address |
+ .text |
+ .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 |
+__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 |
+ |
+ lwz 0, 0(3) #deref pointer into r0 |
+ |
+ cmpwi cr7, 0, 0 #compare r0 with 0, store result in cr7. |
+ beq+ cr7, 1f #jump to label 1 if r0 was 0 |
+ |
+ b __cp_cancel #else call cancel |
+1: |
+ #ok, the cancel flag was not set |
+ # syscall: number goes to r0, the rest 3-8 |
+ mr 0, 4 # put the system call number into r0 |
+ mr 3, 5 # Shift the arguments: arg1 |
+ mr 4, 6 # arg2 |
+ mr 5, 7 # arg3 |
+ mr 6, 8 # arg4 |
+ mr 7, 9 # arg5 |
+ mr 8, 10 # arg6 |
+ sc |
+__cp_end: |
+ bnslr+ # return if no summary overflow. |
+ #else negate result. |
+ neg 3, 3 |
+ blr |
+__cp_cancel: |
+ b __cancel |