include/rtems/asm.h

0001 /**
0002  * @file
0003  *
0004  * @ingroup RTEMSScoreCPUSPARCASM
0005  *
0006  * @brief This header file provides interfaces to address problems caused by
0007  *   incompatible flavor of assemblers and toolsets.
0008  *
0009  * This include file attempts to address the problems
0010  * caused by incompatible flavors of assemblers and
0011  * toolsets.  It primarily addresses variations in the
0012  * use of leading underscores on symbols and the requirement
0013  * that register names be preceded by a %.
0014  *
0015  * NOTE: The spacing in the use of these macros
0016  *       is critical to them working as advertised.
0017  */
0018
0019 /*
0020  *  COPYRIGHT:
0021  *
0022  *  This file is based on similar code found in newlib available
0023  *  from ftp.cygnus.com.  The file which was used had no copyright
0024  *  notice.  This file is freely distributable as long as the source
0025  *  of the file is noted.
0026  */
0027
0028 #ifndef _RTEMS_ASM_H
0029 #define _RTEMS_ASM_H
0030
0031 /*
0032  *  Indicate we are in an assembly file and get the basic CPU definitions.
0033  */
0034
0035 #ifndef ASM
0036 #define ASM
0037 #endif
0038
0039 #include <rtems/score/cpuopts.h>
0040 #include <rtems/score/cpu.h>
0041
0042 /**
0043  * @defgroup RTEMSScoreCPUSPARCASM SPARC Assembler Support
0044  *
0045  * @ingroup RTEMSScoreCPUSPARC
0046  *
0047  * @brief SPARC Assembler Support
0048  *
0049  * @{
0050  */
0051
0052 /*
0053  *  Recent versions of GNU cpp define variables which indicate the
0054  *  need for underscores and percents.  If not using GNU cpp or
0055  *  the version does not support this, then you will obviously
0056  *  have to define these as appropriate.
0057  */
0058
0059 /* XXX __USER_LABEL_PREFIX__ and __REGISTER_PREFIX__ do not work on gcc 2.7.0 */
0060 /* XXX The following ifdef magic fixes the problem but results in a warning   */
0061 /* XXX when compiling assembly code.                                          */
0062
0063 #ifndef __USER_LABEL_PREFIX__
0064 #define __USER_LABEL_PREFIX__ _
0065 #endif
0066
0067 #ifndef __REGISTER_PREFIX__
0068 #define __REGISTER_PREFIX__
0069 #endif
0070
0071 /* Use the right prefix for global labels.  */
0072
0073 #define SYM(x) RTEMS_XCONCAT(__USER_LABEL_PREFIX__, x)
0074
0075 /* Use the right prefix for registers.  */
0076
0077 #define REG(x) RTEMS_XCONCAT(__REGISTER_PREFIX__, x)
0078
0079 /*
0080  *  define macros for all of the registers on this CPU
0081  *
0082  *  EXAMPLE:     #define d0 REG (d0)
0083  */
0084
0085 /*
0086  *  Define macros to handle section beginning and ends.
0087  */
0088
0089
0090 #define BEGIN_CODE_DCL .text
0091 #define END_CODE_DCL
0092 #define BEGIN_DATA_DCL .data
0093 #define END_DATA_DCL
0094 #define BEGIN_CODE .text
0095 #define END_CODE
0096 #define BEGIN_DATA
0097 #define END_DATA
0098 #define BEGIN_BSS
0099 #define END_BSS
0100 #define END
0101
0102 /*
0103  *  Following must be tailor for a particular flavor of the C compiler.
0104  *  They may need to put underscores in front of the symbols.
0105  */
0106
0107 #define PUBLIC(sym) .globl SYM (sym)
0108 #define EXTERN(sym) .globl SYM (sym)
0109
0110 /*
0111  *  Entry for traps which jump to a programmer-specified trap handler.
0112  */
0113
0114 #define TRAP(_vector, _handler)  \
0115   mov   %psr, %l0 ; \
0116   sethi %hi(_handler), %l4 ; \
0117   jmp   %l4+%lo(_handler); \
0118   mov   _vector, %l3
0119
0120 /*
0121  *  Used for the reset trap to avoid a supervisor instruction
0122  */
0123
0124 #define RTRAP(_vector, _handler)  \
0125   mov   %g0, %l0 ; \
0126   sethi %hi(_handler), %l4 ; \
0127   jmp   %l4+%lo(_handler); \
0128   mov   _vector, %l3
0129
0130 #endif
0131
0132 /** @} */