mallocng/aligned_alloc: check for malloc failure

[musl] / src / thread / powerpc / clone.s

diff --git a/src/thread/powerpc/clone.s b/src/thread/powerpc/clone.s
index cea69e9..da13f44 100644 (file)
--- a/src/thread/powerpc/clone.s
+++ b/src/thread/powerpc/clone.s
@@ -1,5 +1,6 @@
 .text
 .global __clone
+.hidden __clone
 .type __clone, %function
 __clone:
 # int clone(fn, stack, flags, arg, ptid, tls, ctid)
@@ -13,17 +14,20 @@ __clone:
 # SYS_clone = 120
 # SYS_exit = 1
 
-# in order that the child can find the start func and its arg, we need to store it into
-# non-volative regs. to do so, we have to store those 2 regs into our stackframe, so
-# we can restore them later.
-stw 30, -4(1)
-stw 31, -8(1)
-subi 1, 1, 16 
+# store non-volatile regs r30, r31 on stack in order to put our
+# start func and its arg there
+stwu 30, -16(1)
+stw 31, 4(1)
 
 # save r3 (func) into r30, and r6(arg) into r31
 mr 30, 3
 mr 31, 6
 
+# create initial stack frame for new thread
+clrrwi 4, 4, 4
+li 0, 0
+stwu 0, -16(4)
+
 #move c into first arg
 mr 3, 5
 #mr 4, 4
@@ -37,19 +41,9 @@ li 0, 120
 sc
 
 # check for syscall error
-#this code should be more efficient, but it borks
-#bns+ 1f # jump to label 1 if no summary overflow.
+bns+ 1f # jump to label 1 if no summary overflow.
 #else
-#neg 3, 3 #negate the result (errno)
-#b 2f # jump to epilogue
-
-# this error check code at least does not spoil the clone call.
-#mfcr    0                      # Check for an error
-#rlwinm  4, 0, 0, 3, 3        # by checking for bit 28.
-#cmplwi  0, 4, 0               # It is an error if non-zero.
-#beq     0, 1f                  # Jump if not an error.
-#neg     3, 3                  # Negate the error number.
-#b       2f # jump to epilogue
+neg 3, 3 #negate the result (errno)
 1:
 # compare sc result with 0
 cmpwi cr7, 3, 0
@@ -58,8 +52,7 @@ cmpwi cr7, 3, 0
 bne cr7, 2f
 
 #else: we're the child
-#call funcptr
-# move arg (d) into r3
+#call funcptr: move arg (d) into r3
 mr 3, 31
 #move r30 (funcptr) into CTR reg
 mtctr 30
@@ -72,12 +65,9 @@ sc
 2:
 
 # restore stack
+lwz 30, 0(1)
+lwz 31, 4(1)
 addi 1, 1, 16
-lwz 30, -4(1)
-lwz 31, -8(1)
 
 blr
 
-
-
-