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Date: Sat, 17 Nov 2007 00:31:36 -0500
From: Ulrich Drepper <drepper@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, mingo@...e.hu, tglx@...utronix.de,
torvalds@...ux-foundation.org
Subject: [PATCHv3 2/4] x86&x86-64 support for sys_indirect
This part adds support for sys_indirect on x86 and x86-64.
arch/x86/ia32/ia32entry.S | 2 ++
arch/x86/ia32/sys_ia32.c | 31 +++++++++++++++++++++++++++++++
arch/x86/kernel/syscall_table_32.S | 1 +
include/asm-x86/indirect.h | 5 +++++
include/asm-x86/indirect_32.h | 23 +++++++++++++++++++++++
include/asm-x86/indirect_64.h | 34 ++++++++++++++++++++++++++++++++++
include/asm-x86/unistd_32.h | 3 ++-
include/asm-x86/unistd_64.h | 2 ++
8 files changed, 100 insertions(+), 1 deletion(-)
--- arch/x86/ia32/ia32entry.S
+++ arch/x86/ia32/ia32entry.S
@@ -400,6 +400,7 @@ END(ia32_ptregs_common)
.section .rodata,"a"
.align 8
+ .globl ia32_sys_call_table
ia32_sys_call_table:
.quad sys_restart_syscall
.quad sys_exit
@@ -726,4 +727,5 @@ ia32_sys_call_table:
.quad compat_sys_timerfd
.quad sys_eventfd
.quad sys32_fallocate
+ .quad sys32_indirect /* 325 */
ia32_syscall_end:
--- arch/x86/ia32/sys_ia32.c
+++ arch/x86/ia32/sys_ia32.c
@@ -887,3 +887,34 @@ asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
((u64)len_hi << 32) | len_lo);
}
+
+asmlinkage long sys32_indirect(struct indirect_registers32 __user *userregs,
+ void __user *userparams, size_t paramslen,
+ int flags)
+{
+ extern long (*ia32_sys_call_table[])(u32, u32, u32, u32, u32, u32);
+
+ struct indirect_registers32 regs;
+ long result;
+
+ if (copy_from_user(®s, userregs, sizeof(regs)))
+ return -EFAULT;
+
+ switch (INDIRECT_SYSCALL32(®s))
+ {
+ default:
+ return -EINVAL;
+ }
+
+ if (paramslen > sizeof(union indirect_params))
+ return -EINVAL;
+ result = -EFAULT;
+ if (!copy_from_user(¤t->indirect_params, userparams, paramslen))
+ result = ia32_sys_call_table[regs.eax](regs.ebx, regs.ecx,
+ regs.edx, regs.esi,
+ regs.edi, regs.ebp);
+
+ memset(¤t->indirect_params, '\0', paramslen);
+
+ return result;
+}
--- arch/x86/kernel/syscall_table_32.S
+++ arch/x86/kernel/syscall_table_32.S
@@ -324,3 +324,4 @@ ENTRY(sys_call_table)
.long sys_timerfd
.long sys_eventfd
.long sys_fallocate
+ .long sys_indirect /* 325 */
--- /dev/null
+++ include/asm-x86/indirect_32.h
@@ -0,0 +1,23 @@
+#ifndef _ASM_X86_INDIRECT_32_H
+#define _ASM_X86_INDIRECT_32_H
+
+struct indirect_registers {
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+ __u32 esi;
+ __u32 edi;
+ __u32 ebp;
+};
+
+#define INDIRECT_SYSCALL(regs) (regs)->eax
+
+#define CALL_INDIRECT(regs) \
+ ({ extern long (*sys_call_table[]) (__u32, __u32, __u32, __u32, __u32, __u32); \
+ sys_call_table[INDIRECT_SYSCALL(regs)] ((regs)->ebx, (regs)->ecx, \
+ (regs)->edx, (regs)->esi, \
+ (regs)->edi, (regs)->ebp); \
+ })
+
+#endif
--- /dev/null
+++ include/asm-x86/indirect_64.h
@@ -0,0 +1,34 @@
+#ifndef _ASM_X86_INDIRECT_64_H
+#define _ASM_X86_INDIRECT_64_H
+
+struct indirect_registers {
+ __u64 rax;
+ __u64 rdi;
+ __u64 rsi;
+ __u64 rdx;
+ __u64 r10;
+ __u64 r8;
+ __u64 r9;
+};
+
+struct indirect_registers32 {
+ __u32 eax;
+ __u32 ebx;
+ __u32 ecx;
+ __u32 edx;
+ __u32 esi;
+ __u32 edi;
+ __u32 ebp;
+};
+
+#define INDIRECT_SYSCALL(regs) (regs)->rax
+#define INDIRECT_SYSCALL32(regs) (regs)->eax
+
+#define CALL_INDIRECT(regs) \
+ ({ extern long (*sys_call_table[]) (__u64, __u64, __u64, __u64, __u64, __u64); \
+ sys_call_table[INDIRECT_SYSCALL(regs)] ((regs)->rdi, (regs)->rsi, \
+ (regs)->rdx, (regs)->r10, \
+ (regs)->r8, (regs)->r9); \
+ })
+
+#endif
--- /dev/null
+++ include/asm-x86/indirect.h
@@ -0,0 +1,5 @@
+#ifdef CONFIG_X86_32
+# include "indirect_32.h"
+#else
+# include "indirect_64.h"
+#endif
--- include/asm-x86/unistd_32.h
+++ include/asm-x86/unistd_32.h
@@ -330,10 +330,11 @@
#define __NR_timerfd 322
#define __NR_eventfd 323
#define __NR_fallocate 324
+#define __NR_indirect 325
#ifdef __KERNEL__
-#define NR_syscalls 325
+#define NR_syscalls 326
#define __ARCH_WANT_IPC_PARSE_VERSION
#define __ARCH_WANT_OLD_READDIR
--- include/asm-x86/unistd_64.h
+++ include/asm-x86/unistd_64.h
@@ -635,6 +635,8 @@ __SYSCALL(__NR_timerfd, sys_timerfd)
__SYSCALL(__NR_eventfd, sys_eventfd)
#define __NR_fallocate 285
__SYSCALL(__NR_fallocate, sys_fallocate)
+#define __NR_indirect 286
+__SYSCALL(__NR_indirect, sys_indirect)
#ifndef __NO_STUBS
#define __ARCH_WANT_OLD_READDIR
-
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