diff options
Diffstat (limited to 'gcc/ada/sigtramp-vxworks-vxsim.c')
| -rw-r--r-- | gcc/ada/sigtramp-vxworks-vxsim.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/gcc/ada/sigtramp-vxworks-vxsim.c b/gcc/ada/sigtramp-vxworks-vxsim.c new file mode 100644 index 0000000..7e9f2b8 --- /dev/null +++ b/gcc/ada/sigtramp-vxworks-vxsim.c @@ -0,0 +1,146 @@ +/**************************************************************************** + * * + * GNAT COMPILER COMPONENTS * + * * + * S I G T R A M P * + * * + * Asm Implementation File * + * * + * Copyright (C) 2011-2015, Free Software Foundation, Inc. * + * * + * GNAT is free software; you can redistribute it and/or modify it under * + * terms of the GNU General Public License as published by the Free Soft- * + * ware Foundation; either version 3, or (at your option) any later ver- * + * sion. GNAT is distributed in the hope that it will be useful, but WITH- * + * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * + * or FITNESS FOR A PARTICULAR PURPOSE. * + * * + * As a special exception under Section 7 of GPL version 3, you are granted * + * additional permissions described in the GCC Runtime Library Exception, * + * version 3.1, as published by the Free Software Foundation. * + * * + * In particular, you can freely distribute your programs built with the * + * GNAT Pro compiler, including any required library run-time units, using * + * any licensing terms of your choosing. See the AdaCore Software License * + * for full details. * + * * + * GNAT was originally developed by the GNAT team at New York University. * + * Extensive contributions were provided by Ada Core Technologies Inc. * + * * + ****************************************************************************/ + +/******************************************************** + * VxWorks VXSIM version of the __gnat_sigtramp service * + ********************************************************/ + +#undef CPU + +#ifndef __RTP__ +#define CPU SIMNT +#else +#define CPU SIMPENTIUM +#endif + +#include "sigtramp.h" +/* See sigtramp.h for a general explanation of functionality. */ + +#include <vxWorks.h> +#include <arch/../regs.h> +#ifndef __RTP__ +#include <sigLib.h> +#else +#include <signal.h> +#include <regs.h> + +typedef struct mcontext + { + REG_SET regs; + } mcontext_t; + +typedef struct ucontext + { + mcontext_t uc_mcontext; /* register set */ + struct ucontext * uc_link; /* not used */ + sigset_t uc_sigmask; /* set of signals blocked */ + stack_t uc_stack; /* stack of context signaled */ + } ucontext_t; +#endif + +/* ---------------------- + -- General comments -- + ---------------------- + + Stubs are generated from toplevel asms and .cfi directives, much simpler + to use and check for correctness than manual encodings of CFI byte + sequences. The general idea is to establish CFA as sigcontext->sc_pregs + (for DKM) and mcontext (for RTP) and state where to find the registers as + offsets from there. + + As of today, we support a stub providing CFI info for common + registers (GPRs, LR, ...). We might need variants with support for floating + point or altivec registers as well at some point. + + Checking which variant should apply and getting at sc_pregs / mcontext + is simpler to express in C (we can't use offsetof in toplevel asms and + hardcoding constants is not workable with the flurry of VxWorks variants), + so this is the choice for our toplevel interface. + + Note that the registers we "restore" here are those to which we have + direct access through the system sigcontext structure, which includes + only a partial set of the non-volatiles ABI-wise. */ + +/* ------------------------------------------- + -- Prototypes for our internal asm stubs -- + ------------------------------------------- + + Eventhough our symbols will remain local, the prototype claims "extern" + and not "static" to prevent compiler complaints about a symbol used but + never defined. */ + +/* sigtramp stub providing CFI info for common registers. */ + +extern void __gnat_sigtramp_vxsim_common +(int signo, void *siginfo, void *sigcontext, + __sigtramphandler_t * handler, void * sc_pregs); + + +/* ------------------------------------- + -- Common interface implementation -- + ------------------------------------- + + We enforce optimization to minimize the overhead of the extra layer. */ + +void __gnat_sigtramp_vxsim (int signo, void *si, void *sc, + __sigtramphandler_t * handler) + __attribute__((optimize(2))); + +void __gnat_sigtramp_vxsim (int signo, void *si, void *sc, + __sigtramphandler_t * handler) +{ +#ifdef __RTP__ + mcontext_t *mcontext = &((ucontext_t *) sc)->uc_mcontext; + + /* Pass MCONTEXT in the fifth position so that the assembly code can find + it at the same stack location or in the same register as SC_PREGS. */ + __gnat_sigtramp_vxsim_common (signo, si, mcontext, handler, mcontext); +#else + struct sigcontext * sctx = (struct sigcontext *) sc; + + __gnat_sigtramp_vxsim_common (signo, si, sctx, handler, sctx->sc_pregs); +#endif +} + +/* Include the target specific bits. */ +#include "sigtramp-vxworks-target.inc" + +/* sigtramp stub for common registers. */ + +#define TRAMP_COMMON __gnat_sigtramp_vxsim_common + +asm (SIGTRAMP_START(TRAMP_COMMON)); +asm (CFI_DEF_CFA); +asm (CFI_COMMON_REGS); +asm (SIGTRAMP_BODY); +asm (SIGTRAMP_END(TRAMP_COMMON)); + + |