1 /* Copyright (C) 2003, 2004 Red Hat, Inc.
2 * Contributed by Alexandre Oliva <aoliva@redhat.com>
3 * Based on ../i386/dl-sysdep.h
5 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
9 * Various assembly language/system dependent hacks that are required
10 * so that we can minimize the amount of platform specific code.
14 * Define this if the system uses RELOCA.
16 #undef ELF_USES_RELOCA
18 /* JMPREL relocs are inside the DT_RELA table. */
19 #define ELF_MACHINE_PLTREL_OVERLAP
21 #define DL_NO_COPY_RELOCS
24 * Initialization sequence for a GOT. Copy the resolver function
25 * descriptor and the pointer to the elf_resolve/link_map data
26 * structure. Initialize the got_value in the module while at that.
28 #define INIT_GOT(GOT_BASE,MODULE) \
30 (MODULE)->loadaddr.got_value = (GOT_BASE); \
31 GOT_BASE[0] = ((unsigned long *)&_dl_linux_resolve)[0]; \
32 GOT_BASE[1] = ((unsigned long *)&_dl_linux_resolve)[1]; \
33 GOT_BASE[2] = (unsigned long) MODULE; \
36 /* Here we define the magic numbers that this dynamic loader should accept */
37 #define MAGIC1 EM_CYGNUS_FRV
40 /* Used for error messages */
41 #define ELF_TARGET "FR-V"
49 } __attribute__((__aligned__(8)));
52 extern int _dl_linux_resolve(void) __attribute__((__visibility__("hidden")));
54 /* 16KiB page alignment. Should perhaps be made dynamic using
55 getpagesize(), based on AT_PAGESZ from auxvt? */
56 #define PAGE_ALIGN 0xffffc000
57 #define ADDR_ALIGN 0x3fff
58 #define OFFS_ALIGN 0x7fffc000
62 /* We must force strings used early in the bootstrap into the data
63 segment, such that they are referenced with GOTOFF instead of
64 GPREL, because GPREL needs the GOT to have already been
66 #undef SEND_EARLY_STDERR
67 #define SEND_EARLY_STDERR(S) \
68 do { static char __s[] = (S); SEND_STDERR (__s); } while (0)
70 #define DL_LOADADDR_TYPE struct elf32_fdpic_loadaddr
72 #define DL_RELOC_ADDR(ADDR, LOADADDR) \
73 (__reloc_pointer ((void*)(ADDR), (LOADADDR).map))
75 #define DL_ADDR_TO_FUNC_PTR(ADDR, LOADADDR) \
76 ((void(*)(void)) _dl_funcdesc_for ((void*)(ADDR), (LOADADDR).got_value))
78 #define _dl_stabilize_funcdesc(val) \
79 ({ __asm__ ("" : "+m" (*(val))); (val); })
81 #define DL_CALL_FUNC_AT_ADDR(ADDR, LOADADDR, SIGNATURE, ...) \
82 ({ struct funcdesc_value fd = { (void*)(ADDR), (LOADADDR).got_value }; \
83 void (*pf)(void) = (void*) _dl_stabilize_funcdesc (&fd); \
84 (* SIGNATURE pf)(__VA_ARGS__); })
86 #define DL_INIT_LOADADDR_BOOT(LOADADDR, BASEADDR) \
87 (__dl_init_loadaddr_map (&(LOADADDR), dl_boot_got_pointer, \
88 dl_boot_ldsomap ?: dl_boot_progmap))
90 #define DL_INIT_LOADADDR_PROG(LOADADDR, BASEADDR) \
91 (__dl_init_loadaddr_map (&(LOADADDR), 0, dl_boot_progmap))
93 #define DL_INIT_LOADADDR_EXTRA_DECLS \
94 int dl_init_loadaddr_load_count;
95 #define DL_INIT_LOADADDR(LOADADDR, BASEADDR, PHDR, PHDRCNT) \
96 (dl_init_loadaddr_load_count = \
97 __dl_init_loadaddr (&(LOADADDR), (PHDR), (PHDRCNT)))
98 #define DL_INIT_LOADADDR_HDR(LOADADDR, ADDR, PHDR) \
99 (__dl_init_loadaddr_hdr ((LOADADDR), (ADDR), (PHDR), \
100 dl_init_loadaddr_load_count))
101 #define DL_LOADADDR_UNMAP(LOADADDR, LEN) \
102 (__dl_loadaddr_unmap ((LOADADDR), (NULL)))
103 #define DL_LIB_UNMAP(LIB, LEN) \
104 (__dl_loadaddr_unmap ((LIB)->loadaddr, (LIB)->funcdesc_ht))
105 #define DL_LOADADDR_BASE(LOADADDR) \
106 ((LOADADDR).got_value)
108 /* This is called from dladdr(), such that we map a function
109 descriptor's address to the function's entry point before trying to
110 find in which library it's defined. */
111 #define DL_LOOKUP_ADDRESS(ADDRESS) (_dl_lookup_address (ADDRESS))
113 #define DL_ADDR_IN_LOADADDR(ADDR, TPNT, TFROM) \
114 (! (TFROM) && __dl_addr_in_loadaddr ((void*)(ADDR), (TPNT)->loadaddr))
116 /* Make sure we only load libraries that use the same number of
117 general-purpose and floating-point registers the dynamic loader was
119 #define DL_CHECK_REG_COUNT(flags) \
120 (((flags & EF_FRV_GPR_MASK) == EF_FRV_GPR_32 ? __FRV_GPR__ == 32 : 1) \
121 && ((flags & EF_FRV_GPR_MASK) == EF_FRV_GPR_64 ? __FRV_GPR__ == 64 : 1) \
122 && ((flags & EF_FRV_FPR_MASK) == EF_FRV_FPR_32 ? __FRV_FPR__ == 32 : 1) \
123 && ((flags & EF_FRV_FPR_MASK) == EF_FRV_FPR_64 ? __FRV_FPR__ == 64 : 1) \
124 && ((flags & EF_FRV_FPR_MASK) == EF_FRV_FPR_NONE ? __FRV_FPR__ == 0 : 1))
126 /* We only support loading FDPIC independently-relocatable shared
127 libraries. It probably wouldn't be too hard to support loading
128 shared libraries that require relocation by the same amount, but we
129 don't know that they exist or would be useful, and the dynamic
130 loader code could leak the whole-library map unless we keeping a
131 bit more state for DL_LOADADDR_UNMAP and DL_LIB_UNMAP, so let's
132 keep things simple for now. */
133 #define DL_CHECK_LIB_TYPE(epnt, piclib, _dl_progname, libname) \
136 if (((epnt)->e_flags & EF_FRV_FDPIC) && ! ((epnt)->e_flags & EF_FRV_PIC)) \
140 _dl_internal_error_number = LD_ERROR_NOTDYN; \
141 _dl_dprintf(2, "%s: '%s' is not an FDPIC shared library" \
142 "\n", (_dl_progname), (libname)); \
147 if (! DL_CHECK_REG_COUNT ((epnt)->e_flags)) \
149 _dl_internal_error_number = LD_ERROR_NOTDYN; \
150 _dl_dprintf(2, "%s: '%s' assumes different register counts" \
151 "\n", (_dl_progname), (libname)); \
157 /* We want want to apply all relocations in the interpreter during
158 bootstrap. Because of this, we have to skip the interpreter
159 relocations in _dl_parse_relocation_information(), see
161 #define DL_SKIP_BOOTSTRAP_RELOC(SYMTAB, INDEX, STRTAB) 0
164 #define _DL_PREAD(FD, BUF, SIZE, OFFSET) \
165 (_dl_pread((FD), (BUF), (SIZE), (OFFSET)))
168 /* We want to return to dlsym() a function descriptor if the symbol
169 turns out to be a function. */
170 #define DL_FIND_HASH_VALUE(TPNT, TYPE_CLASS, SYM) \
171 (((TYPE_CLASS) & ELF_RTYPE_CLASS_DLSYM) \
172 && ELF32_ST_TYPE((SYM)->st_info) == STT_FUNC \
173 ? _dl_funcdesc_for (DL_RELOC_ADDR ((SYM)->st_value, (TPNT)->loadaddr), \
174 (TPNT)->loadaddr.got_value) \
175 : DL_RELOC_ADDR ((SYM)->st_value, (TPNT)->loadaddr))
177 #define DL_GET_READY_TO_RUN_EXTRA_PARMS \
178 , struct elf32_fdpic_loadmap *dl_boot_progmap
179 #define DL_GET_READY_TO_RUN_EXTRA_ARGS \