elf_support.h revision 1.1.2.2
1 1.1.2.2 pgoyette /* $NetBSD: elf_support.h,v 1.1.2.2 2018/03/30 06:20:12 pgoyette Exp $ */ 2 1.1.2.2 pgoyette 3 1.1.2.2 pgoyette /*- 4 1.1.2.2 pgoyette * Copyright (c) 2018 The NetBSD Foundation, Inc. 5 1.1.2.2 pgoyette * All rights reserved. 6 1.1.2.2 pgoyette * 7 1.1.2.2 pgoyette * Redistribution and use in source and binary forms, with or without 8 1.1.2.2 pgoyette * modification, are permitted provided that the following conditions 9 1.1.2.2 pgoyette * are met: 10 1.1.2.2 pgoyette * 1. Redistributions of source code must retain the above copyright 11 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer. 12 1.1.2.2 pgoyette * 2. Redistributions in binary form must reproduce the above copyright 13 1.1.2.2 pgoyette * notice, this list of conditions and the following disclaimer in the 14 1.1.2.2 pgoyette * documentation and/or other materials provided with the distribution. 15 1.1.2.2 pgoyette * 16 1.1.2.2 pgoyette * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 1.1.2.2 pgoyette * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 1.1.2.2 pgoyette * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 1.1.2.2 pgoyette * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 1.1.2.2 pgoyette * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 1.1.2.2 pgoyette * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 1.1.2.2 pgoyette * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 1.1.2.2 pgoyette * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 1.1.2.2 pgoyette * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 1.1.2.2 pgoyette * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 1.1.2.2 pgoyette * POSSIBILITY OF SUCH DAMAGE. 27 1.1.2.2 pgoyette */ 28 1.1.2.2 pgoyette #ifndef _SPARC_ELF_SUPPORT_H 29 1.1.2.2 pgoyette #define _SPARC_ELF_SUPPORT_H 30 1.1.2.2 pgoyette 31 1.1.2.2 pgoyette static inline void 32 1.1.2.2 pgoyette sparc_write_branch(void *where_, void *target) 33 1.1.2.2 pgoyette { 34 1.1.2.2 pgoyette const unsigned int BAA = 0x30800000U; /* ba,a (offset / 4) */ 35 1.1.2.2 pgoyette const unsigned int SETHI = 0x03000000U; /* sethi %hi(0), %g1 */ 36 1.1.2.2 pgoyette const unsigned int JMP = 0x81c06000U; /* jmpl %g1+%lo(0), %g0 */ 37 1.1.2.2 pgoyette 38 1.1.2.2 pgoyette unsigned int *where = (unsigned int *)where_; 39 1.1.2.2 pgoyette unsigned long value = (unsigned long)target; 40 1.1.2.2 pgoyette unsigned long offset = value - (unsigned long)where; 41 1.1.2.2 pgoyette 42 1.1.2.2 pgoyette #define HIVAL(v, s) (((v) >> (s)) & 0x003fffffU) 43 1.1.2.2 pgoyette #define LOVAL(v, s) (((v) >> (s)) & 0x000003ffU) 44 1.1.2.2 pgoyette if (offset + 0x800000 <= 0x7ffffc) { 45 1.1.2.2 pgoyette /* Displacement is within 8MB, use a direct branch. */ 46 1.1.2.2 pgoyette where[0] = BAA | ((offset >> 2) & 0x3fffff); 47 1.1.2.2 pgoyette __asm volatile("iflush %0+0" : : "r" (where)); 48 1.1.2.2 pgoyette return; 49 1.1.2.2 pgoyette } 50 1.1.2.2 pgoyette 51 1.1.2.2 pgoyette /* 52 1.1.2.2 pgoyette * The absolute address is a 32bit value. 53 1.1.2.2 pgoyette * This can be encoded as: 54 1.1.2.2 pgoyette * sethi %hi(value), %g1 55 1.1.2.2 pgoyette * jmp %g1+%lo(value) 56 1.1.2.2 pgoyette */ 57 1.1.2.2 pgoyette where[1] = JMP | LOVAL(value, 0); 58 1.1.2.2 pgoyette __asm volatile("iflush %0+4" : : "r" (where)); 59 1.1.2.2 pgoyette where[0] = SETHI | HIVAL(value, 10); 60 1.1.2.2 pgoyette __asm volatile("iflush %0+0" : : "r" (where)); 61 1.1.2.2 pgoyette #undef HIVAL 62 1.1.2.2 pgoyette #undef LOVAL 63 1.1.2.2 pgoyette } 64 1.1.2.2 pgoyette #endif 65
Indexes created Mon Oct 20 03:09:53 GMT 2025