5d7f2fdf16
* build-globals.sh
- Only look in the nuttx for external symbols used when loading
dynamic shared objects
* include/elf64.h
- Correct the type of fields in the Elf64_Phdr structure
* libs/libc/dlfcn/lib_dlclose.c
- Distinguish between ET_DYN and other objects as the former
has both text and data in a single allocation to reserve
GOT offsets
* libs/libc/dlfcn/lib_dlopen.c
- Code formatting
* libs/libc/modlib/modlib_bind.c
- Distinguish between relocation entry sizes by section type
- Handle RELA style relocations
* libs/libc/modlib/modlib_globals.S
- Formatting fixes
- Symbols should not be weak - they exist or they don't
* include/nuttx/lib/modlib.h
- Add an inidcator to module_s to distinguish between ET_DYN and other
* libs/libc/modlib/modlib_load.c
- ET_DYN objects need to keep the relative displacement between the text
and data sections due to GOT references from the former to the latter.
This also implies that linking may require modification from the default
for the shared objects being produced. For example, default alignment may
mean nearly 64K of wasted space.
* libs/libc/modlib/modlib_unload.c
sched/module/mod_rmmod.c
- Distingusih between freeing of ET_DYN storage and other as the former
is a single allocation.
* libs/libc/modlib/mod_insmod.c
- Cater for ET_DYN objects having init and preinit sections
137 lines
3.6 KiB
Bash
Executable File
137 lines
3.6 KiB
Bash
Executable File
#!/usr/bin/env bash
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############################################################################
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# tools/build-globals.sh
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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#
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# Script to create modlib_global.S which contains a structure define
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# the API names and addresses we will export for resolving symbols in
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# dynamic loaded shared objects. Typically these are libc APIs.
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#
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# Symbols to ignore within the NuttX libraries
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#
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FILTER="^lib_low|^FUNCTION|^STUB|^__start|^_vect|^arm_|^arp_|^bch|^binfmt|^blake|^block_|^cdcacm|^chksum|^clock_|^close_|^crypto_|^devif_|^devnull|^devuran|^devzero|^emerg|^epoll_|^elf_|^_dbgR|^dq_|^env_|^file_|^files_|^fs_|^ftl_|^g_|^get_|^group_|^global|^hcom|^i2c_|^inode_|^iob_|^irq_|^kmm_|^lfs_|^lib_|^local_|^mm_|^modlib_|^mpu_|^mq_|^nglobals|^net_|^netdev_|^nx|^pipecommon|^posix_spawn_file|^psock_|^ramlog|^rammap|^readline_|^register_|^sched_|^sockfd|^spawn_|^sq_|^stm32|^symtab_|^syslog_|^syslogstream|^task_|^tcp_|^timer_|^uart_|^ub[12]|^udp_|^umm_|^umount|^unload_|^unregister|^up_|^usb|^usrsock_|^watchdog|^wd_|globalNames$|nglobals$|global_table$|^\.l"
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if [ -z "${NM}" ]; then
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NM="nm"
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fi
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#
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# Extract symbols from the runtime
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#
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SYMS=`cat System.map | awk '{print $3}' | sort | grep -Ev ${FILTER}`
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SYM=(${SYMS})
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GLOBALS="libs/libc/modlib/modlib_globals.S"
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#
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# Generate the modlib_xxxx_globals.S file
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#
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cat >${GLOBALS} <<__EOF__
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#ifdef __CYGWIN__
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# define SYMBOL(s) _##s
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# define GLOBAL .global
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# define SECTION .data
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.macro GLOBAL ep
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.global SYMBOL(\ep)
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.type SYMBOL(\ep), "object"
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.endm
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.macro SIZE ep
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.endm
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#elif defined(__ELF__)
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# define SYMBOL(s) s
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# define SECTION .data
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.macro GLOBAL ep
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.global SYMBOL(\ep)
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.type SYMBOL(\ep), "object"
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.endm
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.macro SIZE ep
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.size SYMBOL(\ep), . - SYMBOL(\ep)
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.endm
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#else
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# define SYMBOL(s) _##s
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# define SECTION .section __DATA,__data
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.macro GLOBAL ep
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.private_extern SYMBOL(\ep)
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.globl SYMBOL(\ep)
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.endm
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.macro SIZE ep
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.endm
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#endif
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#if __SIZEOF_POINTER__ == 8
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.macro globalEntry index, ep
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.quad .l\index
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.quad \ep
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.endm
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# define ALIGN 8
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#else
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.macro globalEntry index, ep
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.long .l\index
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.long \ep
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.endm
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# define ALIGN 4
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#endif
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#ifdef __ARM_ARCH_ISA_THUMB2
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# ifdef __ARM_ARCH_7M__
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.arch armv7e-m
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# elif defined ___ARM_ARCH 8
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.arch armv8-m.base
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#endif
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#ifdef __ARM_ASM_SYNTAX_UNIFIED__
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.syntax unified
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#endif
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.thumb
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#endif
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.data
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.align ALIGN
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GLOBAL globalNames
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SYMBOL(globalNames):
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__EOF__
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for ((i = 0; i < ${#SYM[@]}; i++))
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do
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echo ".l${i}: .string \"${SYM[$i]}\"" >>${GLOBALS}
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done
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cat >>${GLOBALS} <<__EOF__
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SIZE globalNames
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.align ALIGN
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GLOBAL nglobals
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SYMBOL(nglobals):
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.word ${#SYM[@]}
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SIZE nglobals
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.align ALIGN
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GLOBAL global_table
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SYMBOL(global_table):
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__EOF__
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for ((i = 0; i < ${#SYM[@]}; i++))
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do
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echo " globalEntry ${i}, ${SYM[$i]}" >>${GLOBALS}
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done
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cat >>${GLOBALS} <<__EOF__
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SIZE global_table
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__EOF__
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echo "${#SYM[@]} symbols defined"
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