Xv6 with picoc & Linkage editor: asm.h Source File

Xv6 with picoc & Linkage editor v1.0

The project delineate mutual cohesion between c library, linkage editor ( linker), interpreter and operating system by porting the same on xv6 kernel

File List

00001 //
00002 // assembler macros to create x86 segments
00003 //
00004 
00005 #define SEG_NULLASM                                             \
00006         .word 0, 0;                                             \
00007         .byte 0, 0, 0, 0
00008 
00009 // The 0xC0 means the limit is in 4096-byte units
00010 // and (for executable segments) 32-bit mode.
00011 #define SEG_ASM(type,base,lim)                                  \
00012         .word (((lim) >> 12) & 0xffff), ((base) & 0xffff);      \
00013         .byte (((base) >> 16) & 0xff), (0x90 | (type)),         \
00014                 (0xC0 | (((lim) >> 28) & 0xf)), (((base) >> 24) & 0xff)
00015 
00016 #define STA_X     0x8       // Executable segment
00017 #define STA_E     0x4       // Expand down (non-executable segments)
00018 #define STA_C     0x4       // Conforming code segment (executable only)
00019 #define STA_W     0x2       // Writeable (non-executable segments)
00020 #define STA_R     0x2       // Readable (executable segments)
00021 #define STA_A     0x1       // Accessed