ref: 77b464a5d5648bb646467111b8faf719cd5c46b6
parent: 162013b02e76608b9d5cd7f1d2db280e970c27ad
author: Jacob Moody <moody@posixcafe.org>
date: Tue Mar 19 21:11:03 EDT 2024
posix-ppc64le support Tested on power9 Talos II running Debian
--- /dev/null
+++ b/posix-ppc64le/Makefile
@@ -1,0 +1,25 @@
+ROOT=..
+include ../Make.config
+LIB=../libmachdep.a
+
+CFLAGS+= -Wa,-mregnames
+
+OFILES=\
+ getcallerpc.$O\
+ tas.$O
+
+default: $(LIB)
+$(LIB): $(OFILES)
+ $(AR) r $(LIB) $(OFILES)
+ $(RANLIB) $(LIB)
+
+%.$O: %.c
+ $(CC) $(CFLAGS) $*.c
+
+%.$O: %.s
+ $(AS) -o $*.$O $*.s
+
+%.s: %.spp
+ cpp $*.spp >$*.s
+
+
--- /dev/null
+++ b/posix-ppc64le/getcallerpc.c
@@ -1,0 +1,8 @@
+#include "u.h"
+#include "libc.h"
+
+uintptr
+getcallerpc(void *a)
+{+ return ((uintptr*)a)[-1];
+}
--- /dev/null
+++ b/posix-ppc64le/tas.c
@@ -1,0 +1,37 @@
+#include "u.h"
+#include "libc.h"
+
+/*
+ * first argument (l) is in r3 at entry.
+ * r3 contains return value upon return.
+ */
+int
+tas(int *x)
+{+ int v;
+
+ __asm__("\n sync\n"+ " li r0,0\n"
+ " mr r4,%1 /* &l->val */\n"
+ " lis r5,0xdead /* assemble constant 0xdeaddead */\n"
+ " ori r5,r5,0xdead /* \" */\n"
+ "tas1:\n"
+ " lwarx %0,r4,r0 /* v = l->val with reservation */\n"
+ " cmp cr0,0,%0,r0 /* v == 0 */\n"
+ " bne tas0\n"
+ " stwcx. r5,r4,r0 /* if (l->val same) l->val = 0xdeaddead */\n"
+ " bne tas1\n"
+ "tas0:\n"
+ " sync\n"
+ " isync\n"
+ : "=r" (v)
+ : "r" (x)
+ : "cc", "memory", "r0", "r4", "r5"
+ );
+ switch(v) {+ case 0: return 0;
+ case 0xdeaddead: return 1;
+ default: print("tas: corrupted 0x%lux\n", v);+ }
+ return 0;
+}