diff options
Diffstat (limited to 'libc/sysdeps/linux/i386')
| -rw-r--r-- | libc/sysdeps/linux/i386/sysdep.h | 126 |
1 files changed, 125 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/i386/sysdep.h b/libc/sysdeps/linux/i386/sysdep.h index ffbde7d96..ff67e8a08 100644 --- a/libc/sysdeps/linux/i386/sysdep.h +++ b/libc/sysdeps/linux/i386/sysdep.h @@ -22,7 +22,131 @@ #define _LINUX_I386_SYSDEP_H 1 #include <sys/syscall.h> -#include <sysdeps/i386/sysdep.h> +#include <common/sysdep.h> + +#ifdef __ASSEMBLER__ + +/* Syntactic details of assembler. */ + +/* ELF uses byte-counts for .align, most others use log2 of count of bytes. */ +#define ALIGNARG(log2) 1<<log2 +/* For ELF we need the `.type' directive to make shared libs work right. */ +#define ASM_TYPE_DIRECTIVE(name,typearg) .type name,typearg; +#define ASM_SIZE_DIRECTIVE(name) .size name,.-name; + +/* In ELF C symbols are asm symbols. */ +#undef NO_UNDERSCORES +#define NO_UNDERSCORES + +/* Define an entry point visible from C. + + There is currently a bug in gdb which prevents us from specifying + incomplete stabs information. Fake some entries here which specify + the current source file. */ +#define ENTRY(name) \ + STABS_CURRENT_FILE1("") \ + STABS_CURRENT_FILE(name) \ + ASM_GLOBAL_DIRECTIVE C_SYMBOL_NAME(name); \ + ASM_TYPE_DIRECTIVE (C_SYMBOL_NAME(name),@function) \ + .align ALIGNARG(4); \ + STABS_FUN(name) \ + C_LABEL(name) \ + cfi_startproc; \ + CALL_MCOUNT + +#undef END +#define END(name) \ + cfi_endproc; \ + ASM_SIZE_DIRECTIVE(name) \ + STABS_FUN_END(name) + +#ifdef HAVE_CPP_ASM_DEBUGINFO +/* Disable that goop, because we just pass -g through to the assembler + and it generates proper line number information directly. */ +# define STABS_CURRENT_FILE1(name) +# define STABS_CURRENT_FILE(name) +# define STABS_FUN(name) +# define STABS_FUN_END(name) +#else +/* Remove the following two lines once the gdb bug is fixed. */ +#define STABS_CURRENT_FILE(name) \ + STABS_CURRENT_FILE1 (#name) +#define STABS_CURRENT_FILE1(name) \ + 1: .stabs name,100,0,0,1b; +/* Emit stabs definition lines. We use F(0,1) and define t(0,1) as `int', + the same way gcc does it. */ +#define STABS_FUN(name) STABS_FUN2(name, name##:F(0,1)) +#define STABS_FUN2(name, namestr) \ + .stabs "int:t(0,1)=r(0,1);-2147483648;2147483647;",128,0,0,0; \ + .stabs #namestr,36,0,0,name; +#define STABS_FUN_END(name) \ + 1: .stabs "",36,0,0,1b-name; +#endif + +/* If compiled for profiling, call `mcount' at the start of each function. */ +#ifdef PROF +/* The mcount code relies on a normal frame pointer being on the stack + to locate our caller, so push one just for its benefit. */ +#define CALL_MCOUNT \ + pushl %ebp; cfi_adjust_cfa_offset (4); movl %esp, %ebp; \ + cfi_def_cfa_register (ebp); call JUMPTARGET(mcount); \ + popl %ebp; cfi_def_cfa (esp, 4); +#else +#define CALL_MCOUNT /* Do nothing. */ +#endif + +#ifdef NO_UNDERSCORES +/* Since C identifiers are not normally prefixed with an underscore + on this system, the asm identifier `syscall_error' intrudes on the + C name space. Make sure we use an innocuous name. */ +#define syscall_error __syscall_error +#define mcount _mcount +#endif + +#undef JUMPTARGET +#ifdef __PIC__ +#define JUMPTARGET(name) name##@PLT +#define SYSCALL_PIC_SETUP \ + pushl %ebx; \ + cfi_adjust_cfa_offset (4); \ + call 0f; \ +0: popl %ebx; \ + cfi_adjust_cfa_offset (-4); \ + addl $_GLOBAL_OFFSET_TABLE+[.-0b], %ebx; + + +# define SETUP_PIC_REG(reg) \ + .ifndef __x86.get_pc_thunk.reg; \ + .section .gnu.linkonce.t.__x86.get_pc_thunk.reg,"ax",@progbits; \ + .globl __x86.get_pc_thunk.reg; \ + .hidden __x86.get_pc_thunk.reg; \ + .type __x86.get_pc_thunk.reg,@function; \ +__x86.get_pc_thunk.reg: \ + movl (%esp), %e##reg; \ + ret; \ + .size __x86.get_pc_thunk.reg, . - __x86.get_pc_thunk.reg; \ + .previous; \ + .endif; \ + call __x86.get_pc_thunk.reg + +# define LOAD_PIC_REG(reg) \ + SETUP_PIC_REG(reg); addl $_GLOBAL_OFFSET_TABLE_, %e##reg + +#else +#define JUMPTARGET(name) name +#define SYSCALL_PIC_SETUP /* Nothing. */ +#endif + +/* Local label name for asm code. */ +#ifndef L +#ifdef HAVE_ELF +#define L(name) .L##name +#else +#define L(name) name +#endif +#endif + +#endif /* __ASSEMBLER__ */ #ifndef offsetof # define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER) |