The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/alpha/linux/linux_locore.s

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    1 /* $FreeBSD: releng/6.3/sys/alpha/linux/linux_locore.s 69539 2000-12-03 01:30:31Z marcel $ */
    2 
    3 #include <machine/asm.h>
    4 #include <alpha/linux/linux_syscall.h>
    5 
    6 /*
    7  * Signal "trampoline" code. Invoked from RTE setup by sendsig().
    8  *
    9  * On entry, stack & registers look like:
   10  *
   11  *      a0      signal number
   12  *      a1      pointer to siginfo_t
   13  *      a2      pointer to signal context frame (scp)
   14  *      a3      address of handler
   15  *      sp+0    saved hardware state
   16  *                      .
   17  *                      .
   18  *      scp+0   beginning of signal context frame
   19  */
   20 
   21 /*
   22  * System call glue.
   23  */
   24 #define LINUX_SYSCALLNUM(name)                                   \
   25         ___CONCAT(LINUX_SYS_,name)
   26 
   27 #define LINUX_CALLSYS_NOERROR(name)                              \
   28         ldiq    v0, LINUX_SYSCALLNUM(name);                      \
   29         call_pal PAL_OSF1_callsys
   30 
   31 
   32         
   33 NESTED(linux_sigcode,0,0,ra,0,0)
   34         lda     sp, -16(sp)             /* save the sigcontext pointer */
   35         stq     a2, 0(sp)
   36         jsr     ra, (t12)               /* call the signal handler (t12==pv) */
   37         ldq     a0, 0(sp)               /* get the sigcontext pointer */
   38         lda     sp, 16(sp)
   39                                         /* and call sigreturn() with it. */
   40         LINUX_CALLSYS_NOERROR(osf1_sigreturn)
   41         mov     v0, a0                  /* if that failed, get error code */
   42         LINUX_CALLSYS_NOERROR(exit)     /* and call exit() with it. */
   43 XNESTED(linux_esigcode,0)
   44         END(linux_sigcode)
   45 
   46         .data
   47         EXPORT(linux_szsigcode)
   48         .quad   linux_esigcode-linux_sigcode
   49         .text

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