f87ea91d98
Redo the calculation of NR_syscalls since that disappeared from i386 and use a similar mechanism on x86_64. We now figure out the size of the system call table in arch code and stick that in syscall_table_size. arch/um/kernel/skas/syscall.c defines NR_syscalls in terms of that since its the only thing that needs to know how many system calls there are. The old mechananism that was used on x86_64 is gone. arch/um/include/sysdep-i386/syscalls.h got some formatting since I was looking at it. Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: WANG Cong <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/kernel.h"
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#include "linux/ptrace.h"
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#include "kern_util.h"
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#include "sysdep/ptrace.h"
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#include "sysdep/syscalls.h"
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extern int syscall_table_size;
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#define NR_syscalls (syscall_table_size / sizeof(void *))
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void handle_syscall(struct uml_pt_regs *r)
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{
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struct pt_regs *regs = container_of(r, struct pt_regs, regs);
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long result;
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int syscall;
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syscall_trace(r, 0);
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/*
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* This should go in the declaration of syscall, but when I do that,
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* strace -f -c bash -c 'ls ; ls' breaks, sometimes not tracing
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* children at all, sometimes hanging when bash doesn't see the first
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* ls exit.
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* The assembly looks functionally the same to me. This is
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* gcc version 4.0.1 20050727 (Red Hat 4.0.1-5)
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* in case it's a compiler bug.
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*/
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syscall = UPT_SYSCALL_NR(r);
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if ((syscall >= NR_syscalls) || (syscall < 0))
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result = -ENOSYS;
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else result = EXECUTE_SYSCALL(syscall, regs);
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REGS_SET_SYSCALL_RETURN(r->gp, result);
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syscall_trace(r, 1);
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}
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