/*      $NetBSD: __sigtramp2.S,v 1.8 2021/11/20 19:26:20 thorpej Exp $  */

/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
*  Software Distribution Coordinator  or  [email protected]
*  School of Computer Science
*  Carnegie Mellon University
*  Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/

#include "SYS.h"
#include "assym.h"

/*
* The Alpha signal trampoline is invoked only to return from
* the signal; the kernel calls the signal handler directly.
*
* On entry, the stack looks like:
*
*              ucontext structure      [128] == sp + sizeof(siginfo_t)]
*      sp->    siginfo structure       [0]
*
* The DWARF register numbers for the general purpose registers are the
* same as the architected register numbers.  For Alpha, there is a DWARF
* pseudo-register for signal handler return addresses.
*/

#if defined(__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__)
#define DWARF_SIGRETURN_REG             __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__
#else
#define DWARF_SIGRETURN_REG             64
#endif

#define CFI_OFFSET_DWARF_REG(d, r)      .cfi_offset d, r*8
#define CFI_OFFSET(r)                   CFI_OFFSET_DWARF_REG(r, r)

       .cfi_startproc simple
       .cfi_signal_frame
       .cfi_def_cfa _REG_SP, SIZEOF_SIGINFO + UC_GREGS
       CFI_OFFSET(_REG_V0)
       CFI_OFFSET(_REG_T0)
       CFI_OFFSET(_REG_T1)
       CFI_OFFSET(_REG_T2)
       CFI_OFFSET(_REG_T3)
       CFI_OFFSET(_REG_T4)
       CFI_OFFSET(_REG_T5)
       CFI_OFFSET(_REG_T6)
       CFI_OFFSET(_REG_T7)
       CFI_OFFSET(_REG_S0)
       CFI_OFFSET(_REG_S1)
       CFI_OFFSET(_REG_S2)
       CFI_OFFSET(_REG_S3)
       CFI_OFFSET(_REG_S4)
       CFI_OFFSET(_REG_S5)
       CFI_OFFSET(_REG_S6)
       CFI_OFFSET(_REG_A0)
       CFI_OFFSET(_REG_A1)
       CFI_OFFSET(_REG_A2)
       CFI_OFFSET(_REG_A3)
       CFI_OFFSET(_REG_A4)
       CFI_OFFSET(_REG_A5)
       CFI_OFFSET(_REG_T8)
       CFI_OFFSET(_REG_T9)
       CFI_OFFSET(_REG_T10)
       CFI_OFFSET(_REG_T11)
       CFI_OFFSET(_REG_RA)
       CFI_OFFSET(_REG_T12)    /* a.k.a. _REG_PV */
       CFI_OFFSET(_REG_AT)
       CFI_OFFSET(_REG_GP)
       CFI_OFFSET(_REG_SP)
       .cfi_return_column DWARF_SIGRETURN_REG
       CFI_OFFSET_DWARF_REG(DWARF_SIGRETURN_REG, _REG_PC)

/*
* The unwind entry includes one instruction slot prior to the trampoline
* because the unwinder will look up to (return PC - 1 insn) while unwinding.
* Normally this would be the jump / branch, but since there isn't one in
* this case, we place an explicit nop there instead.
*/
       nop

NESTED_NOPROFILE(__sigtramp_siginfo_2,0,0,ra,0,0)
       ldgp    gp,0(ra)
       lda     a0,(SIZEOF_SIGINFO)(sp) /* get pointer to ucontext */
       CALLSYS_NOERROR(setcontext)     /* and call setcontext() with it */
       ldiq    a0,-1                   /* if that failed, set an exit code */
       CALLSYS_NOERROR(exit)           /* and call exit() */
       .cfi_endproc
END(__sigtramp_siginfo_2)

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