在分析Linux內(nèi)核編譯流程的時(shí)候，看到arch/arm/boot/compressed/piggy.gzip.S將壓縮后的Linux內(nèi)核（arch/arm/boot/compressed/piggy.gzip）包含進(jìn)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:

?

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

仿照piggy.gzip.S實(shí)現(xiàn)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(shù)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: }

?

下面是運(yùn)行main的結(jié)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(zhuǎn)載于:https://www.cnblogs.com/pengdonglin137/p/3599245.html

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