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Mon Jun 10 17:50:31 1996 David Mosberger-Tang <davidm@azstarnet.com>

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* sysdeps/unix/alpha/sysdep.h: Move error-handling code in PSEUDO
 	to PSEUDO_END to improve branch-prediction.  Include .frame
 	directive to make syscalls debugabble.
	(PSEUDO_END): New macro.
	* sysdeps/unix/alpha/sysdep.h, sysdeps/alpha/bb_init_func.S,
 	sysdeps/unix/sysv/linux/alpha/brk.S: Use ldiq instead of ldi since
 	latter is illegal under DEC Unix.
This commit is contained in:
Roland McGrath 1996-06-19 06:37:57 +00:00
parent e3829e904a
commit bb486e187e
1 changed files with 33 additions and 17 deletions
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50
sysdeps/unix/alpha/sysdep.h
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@ -58,25 +58,27 @@ Cambridge, MA 02139, USA. */
.frame sp, 0, ra
#endif
/* Note that while it's better structurally, going back to set errno
can make things confusing if you're debugging---it looks like it's jumping
backwards into the previous fn. */
/* Mark the end of function SYM. */
#undef END
#define END(sym) .end sym
/* Note that PSEUDO/PSEUDO_END use label number 1996---do not use a
label of that number between those two macros! */
#ifdef __STDC__
#define PSEUDO(name, syscall_name, args) \
.globl name; \
.align 3; \
.ent name,0; \
\
1: br gp, 2f; \
2: ldgp gp, 0(gp); \
jmp zero, syscall_error; \
\
name##: \
ldi v0, SYS_ify(syscall_name); \
.frame sp, 0, ra \
.prologue 1; /* yes, we do use gp */ \
ldiq v0, SYS_ify(syscall_name); \
.set noat; \
call_pal PAL_callsys; \
.set at; \
bne a3, 1b; \
bne a3, 1996f; \
3:
#else
#define PSEUDO(name, syscall_name, args) \
@ -84,21 +86,35 @@ name##: \
.align 3; \
.ent name,0; \
\
1: br gp, 2f; \
2: ldgp gp, 0(gp); \
jmp zero, syscall_error; \
\
name/**/: \
ldi v0, SYS_ify(syscall_name); \
.frame sp, 0, ra \
.prologue 1; /* yes, we do use gp */ \
ldiq v0, SYS_ify(syscall_name); \
.set noat; \
call_pal PAL_callsys; \
.set at; \
bne a3, 1b; \
bne a3, 1996f; \
3:
#endif
#undef END
#define END(sym) .end sym
#undef PSEUDO_END
#ifdef PIC
/* When building a shared library, we can use a branch since the text
section of the library is much smaller than 4MB. If we ever break
this assumption, the linker will tell us. */
# define PSEUDO_END(sym) \
1996: \
br zero, __syscall_error; \
END(sym)
#else
# define PSEUDO_END(sym) \
1996: \
br gp, 2f; \
2: ldgp gp, 0(gp); \
jmp zero, __syscall_error; \
END(sym)
#endif
#define r0 v0
#define r1 a4