X-Git-Url: http://nsz.repo.hu/git/?a=blobdiff_plain;f=src%2Fthread%2Fpowerpc%2Fsyscall_cp.s;fp=src%2Fthread%2Fpowerpc%2Fsyscall_cp.s;h=2c97ca041b32e6e1371ed6ec311cd22ef3695c4a;hb=1c8eb8bad791fe9d01d0d4ab77882db634fa933d;hp=0000000000000000000000000000000000000000;hpb=7669d1e334e6b96455eece78da43bf830b93d697;p=musl

diff --git a/src/thread/powerpc/syscall_cp.s b/src/thread/powerpc/syscall_cp.s
new file mode 100644
index 00000000..2c97ca04
--- /dev/null
+++ b/src/thread/powerpc/syscall_cp.s
@@ -0,0 +1,51 @@
+#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
+	.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
+	
+	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 __cancel #else call cancel 
+	# (the return address is not needed, since __cancel never returns)
+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
+	.global __cp_end
+__cp_end:
+	bnslr+ # return if no summary overflow. 
+	#else negate result.
+	neg 3, 3
+	blr