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Date: Fri, 29 Jun 2007 14:48:52 -0700
From: Davide Libenzi <davidel@...ilserver.org>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ulrich Drepper <drepper@...il.com>, Ingo Molnar <mingo@...e.hu>
Subject: [patch 2/6] sys_indirect RFC - add call_syscall helper to the x86 archs
This patch introduces a new call_syscall() helper for the x86 family
archs, to be used by sys_indirect().
Signed-off-by: Davide Libenzi <davidel@...ilserver.org>
- Davide
---
arch/i386/kernel/entry.S | 18 ++++++++++++++++++
arch/x86_64/kernel/entry.S | 18 ++++++++++++++++++
include/asm-i386/unistd.h | 16 ++++++++++++++++
include/asm-x86_64/unistd.h | 15 +++++++++++++++
4 files changed, 67 insertions(+)
Index: linux-2.6.mod/include/asm-x86_64/unistd.h
===================================================================
--- linux-2.6.mod.orig/include/asm-x86_64/unistd.h 2007-06-29 12:12:42.000000000 -0700
+++ linux-2.6.mod/include/asm-x86_64/unistd.h 2007-06-29 12:57:59.000000000 -0700
@@ -669,6 +669,21 @@
const struct sigaction __user *act,
struct sigaction __user *oact,
size_t sigsetsize);
+extern long call_syscall(unsigned int nr, const unsigned long *params);
+
+static inline int indirect_call_ok(unsigned int nr)
+{
+ switch (nr) {
+ case __NR_clone:
+ case __NR_fork:
+ case __NR_vfork:
+ case __NR_rt_sigsuspend:
+ case __NR_sigaltstack:
+ case __NR_iopl:
+ return 0;
+ }
+ return 1;
+}
#endif /* __ASSEMBLY__ */
#endif /* __KERNEL__ */
Index: linux-2.6.mod/arch/i386/kernel/entry.S
===================================================================
--- linux-2.6.mod.orig/arch/i386/kernel/entry.S 2007-06-29 12:12:42.000000000 -0700
+++ linux-2.6.mod/arch/i386/kernel/entry.S 2007-06-29 12:12:48.000000000 -0700
@@ -1023,6 +1023,24 @@
CFI_ENDPROC
ENDPROC(kernel_thread_helper)
+ENTRY(call_syscall)
+ movl $-ENOSYS, %eax
+ movl 4(%esp), %edx
+ cmpl $(nr_syscalls), %edx
+ jae bad_sysc
+ movl 8(%esp), %eax
+ pushl 20(%eax)
+ pushl 16(%eax)
+ pushl 12(%eax)
+ pushl 8(%eax)
+ pushl 4(%eax)
+ pushl (%eax)
+ call *sys_call_table(,%edx,4)
+ addl $24, %esp
+bad_sysc:
+ ret
+ENDPROC(call_syscall)
+
.section .rodata,"a"
#include "syscall_table.S"
Index: linux-2.6.mod/include/asm-i386/unistd.h
===================================================================
--- linux-2.6.mod.orig/include/asm-i386/unistd.h 2007-06-29 12:12:42.000000000 -0700
+++ linux-2.6.mod/include/asm-i386/unistd.h 2007-06-29 12:57:58.000000000 -0700
@@ -368,5 +368,21 @@
#define cond_syscall(x) asm(".weak\t" #x "\n\t.set\t" #x ",sys_ni_syscall")
#endif
+extern long call_syscall(unsigned int nr, const unsigned long *params);
+
+static inline int indirect_call_ok(unsigned int nr)
+{
+ switch (nr) {
+ case __NR_clone:
+ case __NR_fork:
+ case __NR_vfork:
+ case __NR_rt_sigsuspend:
+ case __NR_sigaltstack:
+ case __NR_iopl:
+ return 0;
+ }
+ return 1;
+}
+
#endif /* __KERNEL__ */
#endif /* _ASM_I386_UNISTD_H_ */
Index: linux-2.6.mod/arch/x86_64/kernel/entry.S
===================================================================
--- linux-2.6.mod.orig/arch/x86_64/kernel/entry.S 2007-06-29 12:12:42.000000000 -0700
+++ linux-2.6.mod/arch/x86_64/kernel/entry.S 2007-06-29 12:12:48.000000000 -0700
@@ -1170,3 +1170,21 @@
sysret
CFI_ENDPROC
ENDPROC(ignore_sysret)
+
+ENTRY(call_syscall)
+ movq $-ENOSYS, %rax
+ cmpl $__NR_syscall_max, %edi
+ ja bad_sysc
+ mov %edi, %eax
+ movq %rsi, %r11
+ movq (%r11), %rdi
+ movq 8(%r11), %rsi
+ movq 16(%r11), %rdx
+ movq 24(%r11), %rcx
+ movq 32(%r11), %r8
+ movq 40(%r11), %r9
+ call *sys_call_table(,%rax,8)
+bad_sysc:
+ ret
+ENDPROC(call_syscall)
+
-
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