Subject: [PATCH v4 08/20] powerpc: Include all arch-specific syscall prototypes

From: Rohan McLure <[email-masked]>
Date: Wed, 24 Aug 2022 12:05:36 +1000

Forward declare all syscall handler prototypes where a generic prototype
is not provided in either linux/syscalls.h or linux/compat.h in
asm/syscalls.h. This is required for compile-time type-checking for
syscall handlers, which is implemented later in this series.

32-bit compatibility syscall handlers are expressed in terms of types in
ppc32.h. Expose this header globally.

Signed-off-by: Rohan McLure <[email-masked]>
---
V1 -> V2: Explicitly include prototypes.
V2 -> V3: Remove extraneous #include <asm/compat.h> and ppc_fallocate
prototype. Rename header.
---
 arch/powerpc/include/asm/syscalls.h          | 90 +++++++++++++-----
 .../ppc32.h => include/asm/syscalls_32.h}    |  0
 arch/powerpc/kernel/signal_32.c              |  2 +-
 arch/powerpc/perf/callchain_32.c             |  2 +-
 4 files changed, 70 insertions(+), 24 deletions(-)

diff --git a/arch/powerpc/include/asm/syscalls.h b/arch/powerpc/include/asm/syscalls.h
index 3e3aff0835a6..91417dee534e 100644
--- a/arch/powerpc/include/asm/syscalls.h
+++ b/arch/powerpc/include/asm/syscalls.h
@@ -8,45 +8,91 @@
 #include <linux/types.h>
 #include <linux/compat.h>
 
+#ifdef CONFIG_PPC64
+#include <asm/syscalls_32.h>
+#endif
+#include <asm/unistd.h>
+#include <asm/ucontext.h>
+
 struct rtas_args;
 
+#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
+
+/*
+ * PowerPC architecture-specific syscalls
+ */
+
+long sys_rtas(struct rtas_args __user *uargs);
+long sys_ni_syscall(void);
+
+#ifdef CONFIG_PPC64
+long sys_ppc64_personality(unsigned long personality);
+#ifdef CONFIG_COMPAT
+long compat_sys_ppc64_personality(unsigned long personality);
+#endif /* CONFIG_COMPAT */
+#endif /* CONFIG_PPC64 */
+
+/* Parameters are reordered for powerpc to avoid padding */
+long sys_ppc_fadvise64_64(int fd, int advice,
+			  u32 offset_high, u32 offset_low,
+			  u32 len_high, u32 len_low);
+long sys_swapcontext(struct ucontext __user *old_ctx,
+		     struct ucontext __user *new_ctx, long ctx_size);
 long sys_mmap(unsigned long addr, size_t len,
 	      unsigned long prot, unsigned long flags,
 	      unsigned long fd, off_t offset);
 long sys_mmap2(unsigned long addr, size_t len,
 	       unsigned long prot, unsigned long flags,
 	       unsigned long fd, unsigned long pgoff);
-long sys_ppc64_personality(unsigned long personality);
-long sys_rtas(struct rtas_args __user *uargs);
-long sys_ppc_fadvise64_64(int fd, int advice, u32 offset_high, u32 offset_low,
-			  u32 len_high, u32 len_low);
+long sys_switch_endian(void);
 
-#ifdef CONFIG_COMPAT
-unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
-			       unsigned long prot, unsigned long flags,
-			       unsigned long fd, unsigned long pgoff);
-
-compat_ssize_t compat_sys_pread64(unsigned int fd, char __user *ubuf, compat_size_t count,
-				  u32 reg6, u32 pos1, u32 pos2);
+#ifdef CONFIG_PPC32
+long sys_sigreturn(void);
+long sys_debug_setcontext(struct ucontext __user *ctx, int ndbg,
+			  struct sig_dbg_op __user *dbg);
+#endif
 
-compat_ssize_t compat_sys_pwrite64(unsigned int fd, const char __user *ubuf, compat_size_t count,
-				   u32 reg6, u32 pos1, u32 pos2);
+long sys_rt_sigreturn(void);
 
-compat_ssize_t compat_sys_readahead(int fd, u32 r4, u32 offset1, u32 offset2, u32 count);
+long sys_subpage_prot(unsigned long addr,
+		      unsigned long len, u32 __user *map);
 
-int compat_sys_truncate64(const char __user *path, u32 reg4,
-			  unsigned long len1, unsigned long len2);
+#ifdef CONFIG_COMPAT
+long compat_sys_swapcontext(struct ucontext32 __user *old_ctx,
+			    struct ucontext32 __user *new_ctx,
+			    int ctx_size);
+long compat_sys_old_getrlimit(unsigned int resource,
+			      struct compat_rlimit __user *rlim);
+long compat_sys_sigreturn(void);
+long compat_sys_rt_sigreturn(void);
 
-int compat_sys_ftruncate64(unsigned int fd, u32 reg4, unsigned long len1,
-			   unsigned long len2);
+/* Architecture-specific implementations in sys_ppc32.c */
 
+long compat_sys_mmap2(unsigned long addr, size_t len,
+		      unsigned long prot, unsigned long flags,
+		      unsigned long fd, unsigned long pgoff);
+long compat_sys_ppc_pread64(unsigned int fd,
+			    char __user *ubuf, compat_size_t count,
+			    u32 reg6, u32 pos1, u32 pos2);
+long compat_sys_ppc_pwrite64(unsigned int fd,
+			     const char __user *ubuf, compat_size_t count,
+			     u32 reg6, u32 pos1, u32 pos2);
+long compat_sys_ppc_readahead(int fd, u32 r4,
+			      u32 offset1, u32 offset2, u32 count);
+long compat_sys_ppc_truncate64(const char __user *path, u32 reg4,
+			       unsigned long len1, unsigned long len2);
+long compat_sys_ppc_ftruncate64(unsigned int fd, u32 reg4,
+				unsigned long len1, unsigned long len2);
 long compat_sys_ppc32_fadvise64(int fd, u32 unused, u32 offset1, u32 offset2,
 				size_t len, int advice);
+long compat_sys_ppc_sync_file_range2(int fd, unsigned int flags,
+				     unsigned int offset1,
+				     unsigned int offset2,
+				     unsigned int nbytes1,
+				     unsigned int nbytes2);
+#endif /* CONFIG_COMPAT */
 
-long compat_sys_sync_file_range2(int fd, unsigned int flags,
-				 unsigned int offset1, unsigned int offset2,
-				 unsigned int nbytes1, unsigned int nbytes2);
-#endif
+#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
 
 #endif /* __KERNEL__ */
 #endif /* __ASM_POWERPC_SYSCALLS_H */
diff --git a/arch/powerpc/kernel/ppc32.h b/arch/powerpc/include/asm/syscalls_32.h
similarity index 100%
rename from arch/powerpc/kernel/ppc32.h
rename to arch/powerpc/include/asm/syscalls_32.h
diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index 157a7403e3eb..c114c7f25645 100644
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -43,7 +43,7 @@
 #include <asm/tm.h>
 #include <asm/asm-prototypes.h>
 #ifdef CONFIG_PPC64
-#include "ppc32.h"
+#include <asm/syscalls_32.h>
 #include <asm/unistd.h>
 #else
 #include <asm/ucontext.h>
diff --git a/arch/powerpc/perf/callchain_32.c b/arch/powerpc/perf/callchain_32.c
index b83c47b7947f..ea8cfe3806dc 100644
--- a/arch/powerpc/perf/callchain_32.c
+++ b/arch/powerpc/perf/callchain_32.c
@@ -19,7 +19,7 @@
 #include "callchain.h"
 
 #ifdef CONFIG_PPC64
-#include "../kernel/ppc32.h"
+#include <asm/syscalls_32.h>
 #else  /* CONFIG_PPC64 */
 
 #define __SIGNAL_FRAMESIZE32	__SIGNAL_FRAMESIZE
-- 
2.34.1