forked from luck/tmp_suning_uos_patched
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
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/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <unistd.h>
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#include <signal.h>
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#include <errno.h>
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#include <asm/unistd.h>
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#include "sysdep/ptrace.h"
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#include "sigcontext.h"
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#include "ptrace_user.h"
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#include "task.h"
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#include "user_util.h"
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#include "kern_util.h"
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#include "syscall_user.h"
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#include "tt.h"
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void syscall_handler_tt(int sig, union uml_pt_regs *regs)
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{
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void *sc;
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long result;
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int syscall;
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#ifdef UML_CONFIG_DEBUG_SYSCALL
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int index;
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#endif
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syscall = UPT_SYSCALL_NR(regs);
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sc = UPT_SC(regs);
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SC_START_SYSCALL(sc);
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#ifdef UML_CONFIG_DEBUG_SYSCALL
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index = record_syscall_start(syscall);
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#endif
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syscall_trace(regs, 0);
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result = execute_syscall_tt(regs);
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/* regs->sc may have changed while the system call ran (there may
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* have been an interrupt or segfault), so it needs to be refreshed.
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*/
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UPT_SC(regs) = sc;
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SC_SET_SYSCALL_RETURN(sc, result);
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syscall_trace(regs, 1);
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#ifdef UML_CONFIG_DEBUG_SYSCALL
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record_syscall_end(index, result);
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#endif
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}
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void do_sigtrap(void *task)
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{
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UPT_SYSCALL_NR(TASK_REGS(task)) = -1;
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}
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void do_syscall(void *task, int pid, int local_using_sysemu)
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{
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unsigned long proc_regs[FRAME_SIZE];
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if(ptrace_getregs(pid, proc_regs) < 0)
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tracer_panic("Couldn't read registers");
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UPT_SYSCALL_NR(TASK_REGS(task)) = PT_SYSCALL_NR(proc_regs);
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if(((unsigned long *) PT_IP(proc_regs) >= &_stext) &&
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((unsigned long *) PT_IP(proc_regs) <= &_etext))
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tracer_panic("I'm tracing myself and I can't get out");
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/* advanced sysemu mode set syscall number to -1 automatically */
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if (local_using_sysemu==2)
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return;
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/* syscall number -1 in sysemu skips syscall restarting in host */
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if(ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_NR_OFFSET,
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local_using_sysemu ? -1 : __NR_getpid) < 0)
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tracer_panic("do_syscall : Nullifying syscall failed, "
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"errno = %d", errno);
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}
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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