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authorSteven J. Magnani <steve@digidescorp.com>2010-11-10 19:27:57 +0100
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2010-11-10 19:44:36 +0100
commit54f73a98f6b841f05484e2275c860ae61d49aae2 (patch)
tree17478ac53eb5d0c3f770a27960c90439631a590e
parent2be86fb41e29def10eec97e5f663cc8147227358 (diff)
microblaze: syscall interface
Fix the microblaze syscall interface. Recent mainline kernels no longer carry userland code to invoke syscalls and microblaze can use the uClibc generic code. Signed-off-by: Steven J. Magnani <steve@digidescorp.com> Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
-rw-r--r--libc/sysdeps/linux/microblaze/bits/syscalls.h54
-rw-r--r--libc/sysdeps/linux/microblaze/syscall.c51
2 files changed, 48 insertions, 57 deletions
diff --git a/libc/sysdeps/linux/microblaze/bits/syscalls.h b/libc/sysdeps/linux/microblaze/bits/syscalls.h
index b21851333..f4bdc4522 100644
--- a/libc/sysdeps/linux/microblaze/bits/syscalls.h
+++ b/libc/sysdeps/linux/microblaze/bits/syscalls.h
@@ -4,12 +4,54 @@
# error "Never use <bits/syscalls.h> directly; include <sys/syscall.h> instead."
#endif
-#include <features.h>
-/* Do something very evil for now. Until we create our own syscall
- * macros, short circuit bits/sysnum.h and use asm/unistd.h instead */
-#warning "fixme -- add arch specific syscall macros.h"
-#include <asm/unistd.h>
+#ifndef __ASSEMBLER__
-#endif /* _BITS_SYSCALLS_H */
+#include <errno.h>
+
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
+ ({ \
+ register int __ret __asm__("r3"); \
+ register int _scno __asm__("r12") = name; \
+ LOAD_ARGS_##nr (args); \
+ __asm__ __volatile__("brki r14, 0x8" \
+ : "=r" (__ret) \
+ : "r"(_scno) ASM_ARGS_##nr \
+ : __SYSCALL_CLOBBERS ); \
+ __ret; \
+ })
+
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+ ((unsigned int)(val) >= 0xfffff001U)
+#define LOAD_ARGS_0() do { } while(0)
+#define ASM_ARGS_0
+#define LOAD_ARGS_1(a1) \
+ register int _a1 __asm__("r5") = (int)(a1); \
+ LOAD_ARGS_0()
+#define ASM_ARGS_1 ASM_ARGS_0, "r"(_a1)
+#define LOAD_ARGS_2(a1, a2) \
+ register int _a2 __asm__("r6") = (int)(a2); \
+ LOAD_ARGS_1(a1)
+#define ASM_ARGS_2 ASM_ARGS_1, "r"(_a2)
+#define LOAD_ARGS_3(a1, a2, a3) \
+ register int _a3 __asm__("r7") = (int)(a3); \
+ LOAD_ARGS_2(a1, a2)
+#define ASM_ARGS_3 ASM_ARGS_2, "r"(_a3)
+#define LOAD_ARGS_4(a1, a2, a3, a4) \
+ register int _a4 __asm__("r8") = (int)(a4); \
+ LOAD_ARGS_3(a1, a2, a3)
+#define ASM_ARGS_4 ASM_ARGS_3, "r"(_a4)
+#define LOAD_ARGS_5(a1, a2, a3, a4, a5) \
+ register int _a5 __asm__("r9") = (int)(a5); \
+ LOAD_ARGS_4(a1, a2, a3, a4)
+#define ASM_ARGS_5 ASM_ARGS_4, "r"(_a5)
+#define LOAD_ARGS_6(a1, a2, a3, a4, a5, a6) \
+ register int _a6 __asm__("r10") = (int)(a6); \
+ LOAD_ARGS_5(a1, a2, a3, a4, a5)
+#define ASM_ARGS_6 ASM_ARGS_5, "r"(_a6)
+
+#define __SYSCALL_CLOBBERS "r4", "r14", "cc", "memory"
+
+#endif /* __ASSEMBLER__ */
+#endif /* _BITS_SYSCALLS_H */
diff --git a/libc/sysdeps/linux/microblaze/syscall.c b/libc/sysdeps/linux/microblaze/syscall.c
deleted file mode 100644
index 0e07e4595..000000000
--- a/libc/sysdeps/linux/microblaze/syscall.c
+++ /dev/null
@@ -1,51 +0,0 @@
-/*
- * libc/sysdeps/linux/microblaze/syscall.c -- generic syscall function for linux/microblaze
- *
- * Copyright (C) 2003 John Williams <jwilliams@itee.uq.edu.au>
- * Copyright (C) 2002 NEC Corporation
- * Copyright (C) 2002 Miles Bader <miles@gnu.org>
- *
- * This file is subject to the terms and conditions of the GNU Lesser
- * General Public License. See the file COPYING.LIB in the main
- * directory of this archive for more details.
- *
- * Written by Miles Bader <miles@gnu.org>
- */
-
-#include <errno.h>
-#include <sys/syscall.h>
-
-typedef unsigned long arg_t;
-
-/* Invoke `system call' NUM, passing it the remaining arguments.
- This is completely system-dependent, and not often useful. */
-long
-syscall (long num, arg_t a1, arg_t a2, arg_t a3, arg_t a4, arg_t a5, arg_t a6)
-{
- /* We don't know how many arguments are valid, so A5 and A6 are fetched
- off the stack even for (the majority of) system calls with fewer
- arguments; hopefully this won't cause any problems. A1-A4 are in
- registers, so they're OK. */
- register arg_t a __asm__ (SYSCALL_ARG0) = a1;
- register arg_t b __asm__ (SYSCALL_ARG1) = a2;
- register arg_t c __asm__ (SYSCALL_ARG2) = a3;
- register arg_t d __asm__ (SYSCALL_ARG3) = a4;
- register arg_t e __asm__ (SYSCALL_ARG4) = a5;
- register arg_t f __asm__ (SYSCALL_ARG5) = a6;
- register unsigned long syscall __asm__ (SYSCALL_NUM) = num;
- register unsigned long ret __asm__ (SYSCALL_RET);
- unsigned long ret_sav;
-
- *((unsigned long *)0xFFFF4004) = (unsigned int)('+');
- __asm__ ("brlid r17, 08x; nop;"
- : "=r" (ret)
- : "r" (syscall), "r" (a), "r" (b), "r" (c), "r" (d), "r" (e), "r" (f)
- : SYSCALL_CLOBBERS);
-
- ret_sav=ret;
- *((unsigned long *)0xFFFF4004) = (unsigned int)('-');
-
-
-
- __syscall_return (long, ret);
-}