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_enter(regs);
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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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PT_REGS_SET_SYSCALL_RETURN(regs, result);
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syscall_trace_leave(regs);
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}
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