longjmp.cxx

eCos/RedBoot for勤研ARM AnywhereII(4510) 含全部源代码

//===========================================================================
//
//      longjmp.cxx
//
//      ISO C standard longjmp() function
//
//===========================================================================
//####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
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//####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    jlarmour
// Contributors: 
// Date:         2000-04-30
// Purpose:     
// Description:  Implements ISO standard non-local jump function longjmp()
//               per ISO C para 7.6.2.1. This is the "real" alternative to
//               the inline version of longjmp()
//             
// Usage:       
//
//####DESCRIPTIONEND####
//
//===========================================================================

// CONFIGURATION

#include <pkgconf/libc_setjmp.h>   // Configuration header

// INCLUDES

#include <cyg/infra/cyg_type.h>    // Common type definitions and support
#include <cyg/infra/cyg_trac.h>    // Common tracing code
#include <cyg/infra/cyg_ass.h>     // Common assertion code
#include <cyg/hal/hal_arch.h>      // HAL architecture specific implementation

// We don't want the inline version of longjmp() defined here
#ifdef CYGIMP_LIBC_SETJMP_INLINES
# undef CYGIMP_LIBC_SETJMP_INLINES
#endif

#include <setjmp.h>                // Header for setjmp/longjmp


// FUNCTIONS

void
longjmp( jmp_buf cyg_buf, int cyg_val)
{
    CYG_REPORT_FUNCNAME( "longjmp" );
    CYG_REPORT_FUNCARG2( "&cyg_buf=%08x, cyg_val=%d", &cyg_buf, cyg_val );

    // ANSI says that if we are passed cyg_val==0, then we change it to 1
    if (cyg_val == 0)
        ++cyg_val;

    // we let the HAL do the work

    HAL_REORDER_BARRIER(); // prevent any chance of optimisation re-ordering
    hal_longjmp( cyg_buf, cyg_val );
    HAL_REORDER_BARRIER(); // prevent any chance of optimisation re-ordering

#ifdef CYGDBG_USE_ASSERTS
    CYG_ASSERT( 0, "longjmp should not have reached this point!" );
#else
    for (;;)
        CYG_EMPTY_STATEMENT;
#endif
} // longjmp()

// EOF longjmp.cxx