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powerpc: Enable compile-time check for syscall handlers

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The table of syscall handlers and registered compatibility syscall
handlers has in past been produced using assembly, with function
references resolved at link time. This moves link-time errors to
compile-time, by rewriting systbl.S in C, and including the
linux/syscalls.h, linux/compat.h and asm/syscalls.h headers for
prototypes.

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rohan McLure <rmclure@linux.ibm.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220921065605.1051927-18-rmclure@linux.ibm.com
This commit is contained in:
Rohan McLure 2022-09-21 16:55:57 +10:00 committed by Michael Ellerman
parent 8cd1def4b8
commit 39859aea41
1 changed files with 11 additions and 21 deletions
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32
arch/powerpc/kernel/systbl.S → arch/powerpc/kernel/systbl.c
View file

@ -10,36 +10,26 @@
* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
*/
#include <asm/ppc_asm.h>
#include <linux/syscalls.h>
#include <linux/compat.h>
#include <asm/unistd.h>
#include <asm/syscalls.h>
#ifdef CONFIG_RELOCATABLE
.section .data.rel.ro,"aw"
#else
.section .rodata,"a"
#endif
#define __SYSCALL_WITH_COMPAT(nr, entry, compat) __SYSCALL(nr, entry)
#define __SYSCALL(nr, entry) [nr] = (unsigned long) &entry,
#ifdef CONFIG_PPC64
.p2align 3
#define __SYSCALL(nr, entry) .8byte entry
#else
.p2align 2
#define __SYSCALL(nr, entry) .long entry
#endif
#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native)
.globl sys_call_table
sys_call_table:
const unsigned long sys_call_table[] = {
#ifdef CONFIG_PPC64
#include <asm/syscall_table_64.h>
#else
#include <asm/syscall_table_32.h>
#endif
};
#ifdef CONFIG_COMPAT
#undef __SYSCALL_WITH_COMPAT
#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat)
.globl compat_sys_call_table
compat_sys_call_table:
#define compat_sys_sigsuspend sys_sigsuspend
const unsigned long compat_sys_call_table[] = {
#include <asm/syscall_table_32.h>
#endif
};
#endif /* CONFIG_COMPAT */