#include <linux/shm.h>
#include <linux/compiler.h>
#include <linux/module.h>
+#include <linux/ipc.h>
#include <asm/branch.h>
#include <asm/cachectl.h>
#include <asm/cacheflush.h>
-#include <asm/ipc.h>
#include <asm/asm-offsets.h>
#include <asm/signal.h>
#include <asm/sim.h>
#include <asm/sysmips.h>
#include <asm/uaccess.h>
-asmlinkage int sys_pipe(nabi_no_regargs volatile struct pt_regs regs)
+/*
+ * For historic reasons the pipe(2) syscall on MIPS has an unusual calling
+ * convention. It returns results in registers $v0 / $v1 which means there
+ * is no need for it to do verify the validity of a userspace pointer
+ * argument. Historically that used to be expensive in Linux. These days
+ * the performance advantage is negligible.
+ */
+asmlinkage int sysm_pipe(nabi_no_regargs volatile struct pt_regs regs)
{
int fd[2];
int error, res;
task_size = STACK_TOP;
+ if (len > task_size)
+ return -ENOMEM;
+
if (flags & MAP_FIXED) {
+ /* Even MAP_FIXED mappings must reside within task_size. */
+ if (task_size - len < addr)
+ return -EINVAL;
+
/*
* We do not accept a shared mapping if it would violate
* cache aliasing constraints.
return addr;
}
- if (len > task_size)
- return -ENOMEM;
do_color_align = 0;
if (filp || (flags & MAP_SHARED))
do_color_align = 1;