summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/sys_ppc32.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/sys_ppc32.c')
-rw-r--r--arch/powerpc/kernel/sys_ppc32.c135
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/sys_ppc32.c b/arch/powerpc/kernel/sys_ppc32.c
new file mode 100644
index 0000000000..d451a82292
--- /dev/null
+++ b/arch/powerpc/kernel/sys_ppc32.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * sys_ppc32.c: 32-bit system calls with complex calling conventions.
+ *
+ * Copyright (C) 2001 IBM
+ * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
+ * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
+ *
+ * 32-bit system calls with 64-bit arguments pass those in register pairs.
+ * This must be specially dealt with on 64-bit kernels. The compat_arg_u64_dual
+ * in generic compat syscalls is not always usable because the register
+ * pairing is constrained depending on preceding arguments.
+ *
+ * An analogous problem exists on 32-bit kernels with ARCH_HAS_SYSCALL_WRAPPER,
+ * the defined system call functions take the pt_regs as an argument, and there
+ * is a mapping macro which maps registers to arguments
+ * (SC_POWERPC_REGS_TO_ARGS) which also does not deal with these 64-bit
+ * arguments.
+ *
+ * This file contains these system calls.
+ */
+
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/signal.h>
+#include <linux/resource.h>
+#include <linux/times.h>
+#include <linux/smp.h>
+#include <linux/sem.h>
+#include <linux/msg.h>
+#include <linux/shm.h>
+#include <linux/poll.h>
+#include <linux/personality.h>
+#include <linux/stat.h>
+#include <linux/in.h>
+#include <linux/syscalls.h>
+#include <linux/unistd.h>
+#include <linux/sysctl.h>
+#include <linux/binfmts.h>
+#include <linux/security.h>
+#include <linux/compat.h>
+#include <linux/ptrace.h>
+#include <linux/elf.h>
+#include <linux/ipc.h>
+#include <linux/slab.h>
+
+#include <asm/ptrace.h>
+#include <asm/types.h>
+#include <linux/uaccess.h>
+#include <asm/unistd.h>
+#include <asm/time.h>
+#include <asm/mmu_context.h>
+#include <asm/ppc-pci.h>
+#include <asm/syscalls.h>
+#include <asm/switch_to.h>
+
+#ifdef CONFIG_PPC32
+#define PPC32_SYSCALL_DEFINE4 SYSCALL_DEFINE4
+#define PPC32_SYSCALL_DEFINE5 SYSCALL_DEFINE5
+#define PPC32_SYSCALL_DEFINE6 SYSCALL_DEFINE6
+#else
+#define PPC32_SYSCALL_DEFINE4 COMPAT_SYSCALL_DEFINE4
+#define PPC32_SYSCALL_DEFINE5 COMPAT_SYSCALL_DEFINE5
+#define PPC32_SYSCALL_DEFINE6 COMPAT_SYSCALL_DEFINE6
+#endif
+
+PPC32_SYSCALL_DEFINE6(ppc_pread64,
+ unsigned int, fd,
+ char __user *, ubuf, compat_size_t, count,
+ u32, reg6, u32, pos1, u32, pos2)
+{
+ return ksys_pread64(fd, ubuf, count, merge_64(pos1, pos2));
+}
+
+PPC32_SYSCALL_DEFINE6(ppc_pwrite64,
+ unsigned int, fd,
+ const char __user *, ubuf, compat_size_t, count,
+ u32, reg6, u32, pos1, u32, pos2)
+{
+ return ksys_pwrite64(fd, ubuf, count, merge_64(pos1, pos2));
+}
+
+PPC32_SYSCALL_DEFINE5(ppc_readahead,
+ int, fd, u32, r4,
+ u32, offset1, u32, offset2, u32, count)
+{
+ return ksys_readahead(fd, merge_64(offset1, offset2), count);
+}
+
+PPC32_SYSCALL_DEFINE4(ppc_truncate64,
+ const char __user *, path, u32, reg4,
+ unsigned long, len1, unsigned long, len2)
+{
+ return ksys_truncate(path, merge_64(len1, len2));
+}
+
+PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,
+ unsigned int, fd, u32, reg4,
+ unsigned long, len1, unsigned long, len2)
+{
+ return ksys_ftruncate(fd, merge_64(len1, len2));
+}
+
+PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,
+ int, fd, u32, unused, u32, offset1, u32, offset2,
+ size_t, len, int, advice)
+{
+ return ksys_fadvise64_64(fd, merge_64(offset1, offset2), len,
+ advice);
+}
+
+PPC32_SYSCALL_DEFINE6(ppc_sync_file_range2,
+ int, fd, unsigned int, flags,
+ unsigned int, offset1, unsigned int, offset2,
+ unsigned int, nbytes1, unsigned int, nbytes2)
+{
+ loff_t offset = merge_64(offset1, offset2);
+ loff_t nbytes = merge_64(nbytes1, nbytes2);
+
+ return ksys_sync_file_range(fd, offset, nbytes, flags);
+}
+
+#ifdef CONFIG_PPC32
+SYSCALL_DEFINE6(ppc_fallocate,
+ int, fd, int, mode,
+ u32, offset1, u32, offset2, u32, len1, u32, len2)
+{
+ return ksys_fallocate(fd, mode,
+ merge_64(offset1, offset2),
+ merge_64(len1, len2));
+}
+#endif