i386 unify sysdep.h

Signed-off-by: Austin Foxley <austinf@cetoncorp.com>

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)