在分析Linux內核編譯流程的時候，看到arch/arm/boot/compressed/piggy.gzip.S將壓縮后的Linux內核（arch/arm/boot/compressed/piggy.gzip）包含進來:

1: .section .piggydata,#alloc 2: .globl input_data 3: t_data: 4: .incbin "arch/arm/boot/compressed/piggy.gzip" 5: .globl input_data_end 6: t_data_end:

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我們是不是也可以利用這種方法將一副圖片作為可執行程序的一個段，然后再程序中訪問這個段來達到顯示圖片的目的？下面是我的做法：

仿照piggy.gzip.S實現demo.S:

1: .section .peng 2: .incbin "./logo.jpg"

main.c

1: #include <stdio.h> 2:? 3: extern unsigned int __peng_start; 4: extern unsigned int __peng_end; 5:? 6: char *p = (char *)(&__peng_start); 7: //我們要獲取__peng_start的存放地址，作為字符串首地址，或者數組名來使用。 8: int main(int argc, const char *argv[]) 9: { 10: int i; 11: unsigned int len = 0; 12:? 13: len = (unsigned int)(&__peng_end) - (unsigned int)(&__peng_start); 14:? 15: printf("len = %x\n", len); 16:? 17: printf("%p\n", &__peng_start); 18: printf("%p\n", &__peng_end); 19:? 20: for(i=0; i<len; i++) 21: { 22: if (i % 16 == 0) 23: { 24: printf("\n"); 25: } 26: printf("%3x ", *p++&0xff); 27: } 28:? 29:? 30: return 0; 31: }

Makefile

1: CC=gcc -Wall 2:? 3: main:main.o demo.o 4: $(CC) $^ -Tload.lds -o $@ 5:? 6: main.o:main.c 7:? 8: demo.o:demo.S 9:? 10:? 11: clean: 12: $(RM) *.o main

load.lds

1: OUTPUT_FORMAT("elf32-i386", "elf32-i386", 2: "elf32-i386") 3: OUTPUT_ARCH(i386) 4: ENTRY(_start) 5: SEARCH_DIR("/usr/i486-linux-gnu/lib32"); SEARCH_DIR("/usr/local/lib32"); SEARCH_DIR("/lib32"); SEARCH_DIR("/usr/lib32"); SEARCH_DIR("/usr/i486-linux-gnu/lib"); SEARCH_DIR("/usr/local/lib"); SEARCH_DIR("/lib"); SEARCH_DIR("/usr/lib"); 6: SECTIONS 7: { 8: /* Read-only sections, merged into text segment: */ 9: PROVIDE (__executable_start = SEGMENT_START("text-segment", 0x08048000)); . = SEGMENT_START("text-segment", 0x08048000) + SIZEOF_HEADERS; 10: .interp : { *(.interp) } 11: .note.gnu.build-id : { *(.note.gnu.build-id) } 12: .hash : { *(.hash) } 13: .gnu.hash : { *(.gnu.hash) } 14: .dynsym : { *(.dynsym) } 15: .dynstr : { *(.dynstr) } 16: .gnu.version : { *(.gnu.version) } 17: .gnu.version_d : { *(.gnu.version_d) } 18: .gnu.version_r : { *(.gnu.version_r) } 19: .peng : 20: { 21: . = ALIGN(4); 22: __peng_start = .; 23: *(.peng); 24: __peng_end = .; 25: . = ALIGN(4); 26: } 27: .rel.dyn : 28: { 29: *(.rel.init) 30: *(.rel.text .rel.text.* .rel.gnu.linkonce.t.*) 31: *(.rel.fini) 32: *(.rel.rodata .rel.rodata.* .rel.gnu.linkonce.r.*) 33: *(.rel.data.rel.ro* .rel.gnu.linkonce.d.rel.ro.*) 34: *(.rel.data .rel.data.* .rel.gnu.linkonce.d.*) 35: *(.rel.tdata .rel.tdata.* .rel.gnu.linkonce.td.*) 36: *(.rel.tbss .rel.tbss.* .rel.gnu.linkonce.tb.*) 37: *(.rel.ctors) 38: *(.rel.dtors) 39: *(.rel.got) 40: *(.rel.bss .rel.bss.* .rel.gnu.linkonce.b.*) 41: *(.rel.ifunc) 42: } 43: .rel.plt : 44: { 45: *(.rel.plt) 46: PROVIDE_HIDDEN (__rel_iplt_start = .); 47: *(.rel.iplt) 48: PROVIDE_HIDDEN (__rel_iplt_end = .); 49: } 50: .init : 51: { 52: KEEP (*(.init)) 53: } =0x90909090 54: .plt : { *(.plt) *(.iplt) } 55: .text : 56: { 57: *(.text.unlikely .text.*_unlikely) 58: *(.text .stub .text.* .gnu.linkonce.t.*) 59: /* .gnu.warning sections are handled specially by elf32.em. */ 60: *(.gnu.warning) 61: } =0x90909090 62: .fini : 63: { 64: KEEP (*(.fini)) 65: } =0x90909090 66: PROVIDE (__etext = .); 67: PROVIDE (_etext = .); 68: PROVIDE (etext = .); 69: .rodata : { *(.rodata .rodata.* .gnu.linkonce.r.*) } 70: .rodata1 : { *(.rodata1) } 71: .eh_frame_hdr : { *(.eh_frame_hdr) } 72: .eh_frame : ONLY_IF_RO { KEEP (*(.eh_frame)) } 73: .gcc_except_table : ONLY_IF_RO { *(.gcc_except_table .gcc_except_table.*) } 74: /* Adjust the address for the data segment. We want to adjust up to 75: the same address within the page on the next page up. */ 76: . = ALIGN (CONSTANT (MAXPAGESIZE)) - ((CONSTANT (MAXPAGESIZE) - .) & (CONSTANT (MAXPAGESIZE) - 1)); . = DATA_SEGMENT_ALIGN (CONSTANT (MAXPAGESIZE), CONSTANT (COMMONPAGESIZE)); 77: /* Exception handling */ 78: .eh_frame : ONLY_IF_RW { KEEP (*(.eh_frame)) } 79: .gcc_except_table : ONLY_IF_RW { *(.gcc_except_table .gcc_except_table.*) } 80: /* Thread Local Storage sections */ 81: .tdata : { *(.tdata .tdata.* .gnu.linkonce.td.*) } 82: .tbss : { *(.tbss .tbss.* .gnu.linkonce.tb.*) *(.tcommon) } 83: .preinit_array : 84: { 85: PROVIDE_HIDDEN (__preinit_array_start = .); 86: KEEP (*(.preinit_array)) 87: PROVIDE_HIDDEN (__preinit_array_end = .); 88: } 89: .init_array : 90: { 91: PROVIDE_HIDDEN (__init_array_start = .); 92: KEEP (*(SORT(.init_array.*))) 93: KEEP (*(.init_array)) 94: PROVIDE_HIDDEN (__init_array_end = .); 95: } 96: .fini_array : 97: { 98: PROVIDE_HIDDEN (__fini_array_start = .); 99: KEEP (*(.fini_array)) 100: KEEP (*(SORT(.fini_array.*))) 101: PROVIDE_HIDDEN (__fini_array_end = .); 102: } 103: .ctors : 104: { 105: /* gcc uses crtbegin.o to find the start of 106: the constructors, so we make sure it is 107: first. Because this is a wildcard, it 108: doesn't matter if the user does not 109: actually link against crtbegin.o; the 110: linker won't look for a file to match a 111: wildcard. The wildcard also means that it 112: doesn't matter which directory crtbegin.o 113: is in. */ 114: KEEP (*crtbegin.o(.ctors)) 115: KEEP (*crtbegin?.o(.ctors)) 116: /* We don't want to include the .ctor section from 117: the crtend.o file until after the sorted ctors. 118: The .ctor section from the crtend file contains the 119: end of ctors marker and it must be last */ 120: KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors)) 121: KEEP (*(SORT(.ctors.*))) 122: KEEP (*(.ctors)) 123: } 124: .dtors : 125: { 126: KEEP (*crtbegin.o(.dtors)) 127: KEEP (*crtbegin?.o(.dtors)) 128: KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors)) 129: KEEP (*(SORT(.dtors.*))) 130: KEEP (*(.dtors)) 131: } 132: .jcr : { KEEP (*(.jcr)) } 133: .data.rel.ro : { *(.data.rel.ro.local* .gnu.linkonce.d.rel.ro.local.*) *(.data.rel.ro* .gnu.linkonce.d.rel.ro.*) } 134: .dynamic : { *(.dynamic) } 135: .got : { *(.got) *(.igot) } 136: . = DATA_SEGMENT_RELRO_END (12, .); 137: .got.plt : { *(.got.plt) *(.igot.plt) } 138: .data : 139: { 140: *(.data .data.* .gnu.linkonce.d.*) 141: SORT(CONSTRUCTORS) 142: } 143: .data1 : { *(.data1) } 144: _edata = .; PROVIDE (edata = .); 145: __bss_start = .; 146: .bss : 147: { 148: *(.dynbss) 149: *(.bss .bss.* .gnu.linkonce.b.*) 150: *(COMMON) 151: /* Align here to ensure that the .bss section occupies space up to 152: _end. Align after .bss to ensure correct alignment even if the 153: .bss section disappears because there are no input sections. 154: FIXME: Why do we need it? When there is no .bss section, we don't 155: pad the .data section. */ 156: . = ALIGN(. != 0 ? 32 / 8 : 1); 157: } 158: . = ALIGN(32 / 8); 159: . = ALIGN(32 / 8); 160: _end = .; PROVIDE (end = .); 161: . = DATA_SEGMENT_END (.); 162: /* Stabs debugging sections. */ 163: .stab 0 : { *(.stab) } 164: .stabstr 0 : { *(.stabstr) } 165: .stab.excl 0 : { *(.stab.excl) } 166: .stab.exclstr 0 : { *(.stab.exclstr) } 167: .stab.index 0 : { *(.stab.index) } 168: .stab.indexstr 0 : { *(.stab.indexstr) } 169: .comment 0 : { *(.comment) } 170: /* DWARF debug sections. 171: Symbols in the DWARF debugging sections are relative to the beginning 172: of the section so we begin them at 0. */ 173: /* DWARF 1 */ 174: .debug 0 : { *(.debug) } 175: .line 0 : { *(.line) } 176: /* GNU DWARF 1 extensions */ 177: .debug_srcinfo 0 : { *(.debug_srcinfo) } 178: .debug_sfnames 0 : { *(.debug_sfnames) } 179: /* DWARF 1.1 and DWARF 2 */ 180: .debug_aranges 0 : { *(.debug_aranges) } 181: .debug_pubnames 0 : { *(.debug_pubnames) } 182: /* DWARF 2 */ 183: .debug_info 0 : { *(.debug_info .gnu.linkonce.wi.*) } 184: .debug_abbrev 0 : { *(.debug_abbrev) } 185: .debug_line 0 : { *(.debug_line) } 186: .debug_frame 0 : { *(.debug_frame) } 187: .debug_str 0 : { *(.debug_str) } 188: .debug_loc 0 : { *(.debug_loc) } 189: .debug_macinfo 0 : { *(.debug_macinfo) } 190: /* SGI/MIPS DWARF 2 extensions */ 191: .debug_weaknames 0 : { *(.debug_weaknames) } 192: .debug_funcnames 0 : { *(.debug_funcnames) } 193: .debug_typenames 0 : { *(.debug_typenames) } 194: .debug_varnames 0 : { *(.debug_varnames) } 195: /* DWARF 3 */ 196: .debug_pubtypes 0 : { *(.debug_pubtypes) } 197: .debug_ranges 0 : { *(.debug_ranges) } 198: .gnu.attributes 0 : { KEEP (*(.gnu.attributes)) } 199: /DISCARD/ : { *(.note.GNU-stack) *(.gnu_debuglink) *(.gnu.lto_*) } 200: }

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下面是運行main的結果：

用winhex打開logo.jpg可以看到如下：

可以看到二者是一致的。（29626 = 0x73BA）

轉載于:https://www.cnblogs.com/pengdonglin137/p/3599245.html

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