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-rw-r--r--libc/sysdeps/linux/m68k/Makefile2
-rw-r--r--libc/sysdeps/linux/m68k/brk.c30
2 files changed, 31 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/m68k/Makefile b/libc/sysdeps/linux/m68k/Makefile
index 36970c6df..a98352198 100644
--- a/libc/sysdeps/linux/m68k/Makefile
+++ b/libc/sysdeps/linux/m68k/Makefile
@@ -33,7 +33,7 @@ CRT0_OBJ = crt0.o crt1.o
SSRC= __longjmp.S bsd-_setjmp.S bsd-setjmp.S clone.S setjmp.S vfork.S
SOBJS=$(patsubst %.S,%.o, $(SSRC))
-CSRC=ptrace.c
+CSRC=ptrace.c brk.c
COBJS=$(patsubst %.c,%.o, $(CSRC))
OBJS=$(SOBJS) $(MOBJ) $(COBJS)
diff --git a/libc/sysdeps/linux/m68k/brk.c b/libc/sysdeps/linux/m68k/brk.c
new file mode 100644
index 000000000..1fe1090d3
--- /dev/null
+++ b/libc/sysdeps/linux/m68k/brk.c
@@ -0,0 +1,30 @@
+/* consider this code LGPL - davidm */
+
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <errno.h>
+
+/* This must be initialized data because commons can't have aliases. */
+void * ___brk_addr = 0;
+
+int brk (void *addr)
+{
+ void *newbrk;
+
+ __asm__ volatile ("movel %2,%/d1\n\t"
+ "moveq %1,%/d0\n\t"
+ "trap #0\n\t"
+ "movel %/d0,%0"
+ :"=g" (newbrk)
+ :"i" (__NR_brk),"g" (addr) : "%d0", "%d1");
+
+ ___brk_addr = newbrk;
+
+ if (newbrk < addr)
+ {
+ __set_errno (ENOMEM);
+ return -1;
+ }
+
+ return 0;
+}