From: Martin Schwidefsky <schwidefsky@de.ibm.com>
To: libc-hacker@sources.redhat.com
Subject: [PATCH] svc 0 for s390*.
Date: Mon, 03 Mar 2003 14:30:00 -0000 [thread overview]
Message-ID: <200303031528.56685.schwidefsky@de.ibm.com> (raw)
Hi
kernel 2.5.63 introduced 9 new system calls. This pushes the system call
numbers on s390* over 256. The immediate system call number embedded
in the svc instruction is limited to 256. This makes it necessary to introduce
a second svc path. We will use the svc 0 and general purpose register %r1
for this. The new style system call will take two instructions instead of one,
e.g. "svc 42" will be "lhi %r1,42; svc0". The old style direct svcs will of
course continue to work. Patch and ChangeLog for the glibc part of this
are attached.
blue skies,
Martin.
2003-03-03 Martin Schwidefsky <schwidefsky@de.ibm.com>
* sysdeps/unix/sysv/linux/s390/s390-32/syscall.S (syscall): Add support
for system call numbers > 255.
* sysdeps/unix/sysv/linux/s390/s390-32/syscall.h (DO_CALL,
INLINE_SYSCALL, INTERNAL_SYSCALL_DIRECT, INTERNAL_SYSCALL_SVC0,
INTERNAL_SYSCALL): Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/syscall.S (syscall): Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/syscall.h (DO_CALL,
INLINE_SYSCALL, INTERNAL_SYSCALL_DIRECT, INTERNAL_SYSCALL_SVC0,
INTERNAL_SYSCALL): Likewise.
diff -urN libc/sysdeps/unix/sysv/linux/s390/s390-32/syscall.S libc-s390/sysdeps/unix/sysv/linux/s390/s390-32/syscall.S
--- libc/sysdeps/unix/sysv/linux/s390/s390-32/syscall.S Fri Jul 6 06:56:19 2001
+++ libc-s390/sysdeps/unix/sysv/linux/s390/s390-32/syscall.S Mon Mar 3 10:59:47 2003
@@ -37,15 +37,19 @@
lr %r4,%r5 /* third parameter */
lr %r5,%r6 /* fourth parameter */
l %r6,192(%r15) /* fifth parameter */
- basr %r7,0
-.L0: ex %r1,.L1-.L0(%r7) /* lsb of R1 is subsituted as SVC number */
- l %r15,0(0,%r15) /* load back chain */
- lm %r6,15,24(%r15) /* load registers */
+ basr %r7,0
+0: cl %r1,4f-0b(%r7) /* svc number < 256? */
+ jl 2f
+1: svc 0
+ j 3f
+2: ex %r1,1b-0b(%r7) /* lsb of R1 is subsituted as SVC number */
+3: l %r15,0(%r15) /* load back chain */
+ lm %r6,15,24(%r15) /* load registers */
lhi %r0,-4095
clr %r2,%r0 /* check R2 for error */
jnl SYSCALL_ERROR_LABEL
br %r14 /* return to caller */
-.L1: .word 0x0A00 /* opcode for SVC 0 */
+4: .long 256
PSEUDO_END (syscall)
diff -urN libc/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h libc-s390/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h
--- libc/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h Tue Jan 28 13:04:49 2003
+++ libc-s390/sysdeps/unix/sysv/linux/s390/s390-32/sysdep.h Mon Mar 3 10:59:47 2003
@@ -133,7 +133,12 @@
*/
#define DO_CALL(syscall, args) \
- svc SYS_ify (syscall)
+ .if SYS_ify (syscall) < 256; \
+ svc SYS_ify (syscall); \
+ .else; \
+ lhi %r1,SYS_ify (syscall); \
+ svc 0; \
+ .endif
#define ret \
br 14
@@ -154,8 +159,8 @@
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
-#undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL(name, err, nr, args...) \
+#undef INTERNAL_SYSCALL_DIRECT
+#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
({ \
DECLARGS_##nr(args) \
register int _ret asm("2"); \
@@ -165,6 +170,25 @@
: "i" (__NR_##name) ASMFMT_##nr \
: "memory" ); \
_ret; })
+
+#undef INTERNAL_SYSCALL_SVC0
+#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
+ ({ \
+ DECLARGS_##nr(args) \
+ register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
+ register int _ret asm("2"); \
+ asm volatile ( \
+ "svc 0\n\t" \
+ : "=d" (_ret) \
+ : "d" (_nr), "i" (__NR_##name) ASMFMT_##nr \
+ : "memory" ); \
+ _ret; })
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+ (((__NR_##name) < 256) ? \
+ INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
+ INTERNAL_SYSCALL_SVC0(name, err,nr, args))
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
diff -urN libc/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S libc-s390/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
--- libc/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S Tue Jan 28 13:04:49 2003
+++ libc-s390/sysdeps/unix/sysv/linux/s390/s390-64/syscall.S Mon Mar 3 10:59:47 2003
@@ -37,16 +37,20 @@
lgr %r4,%r5 /* Third parameter. */
lgr %r5,%r6 /* Fourth parameter. */
lg %r6,320(%r15) /* Fifth parameter. */
- basr %r7,0
-.L0: ex %r1,.L1-.L0(%r7) /* Lsb of R1 is subsituted as SVC number. */
- lg %r15,0(%r15) /* Load back chain. */
+ basr %r7,0
+0: clg %r1,4f-0b(%r7) /* svc number < 256? */
+ jl 2f
+1: svc 0
+ j 3f
+2: ex %r1,1b-0b(%r7) /* lsb of R1 is subsituted as SVC number */
+3: lg %r15,0(%r15) /* load back chain */
lmg %r6,15,48(%r15) /* Load registers. */
lghi %r0,-4095
clgr %r2,%r0 /* Check R2 for error. */
jgnl SYSCALL_ERROR_LABEL
br %r14 /* Return to caller. */
-.L1: .word 0x0A00 /* Opcode for SVC 0. */
+4: .quad 256
PSEUDO_END (syscall)
diff -urN libc/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h libc-s390/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h
--- libc/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h Tue Jan 28 13:04:49 2003
+++ libc-s390/sysdeps/unix/sysv/linux/s390/s390-64/sysdep.h Mon Mar 3 10:59:47 2003
@@ -122,7 +122,12 @@
*/
#define DO_CALL(syscall, args) \
- svc SYS_ify (syscall)
+ .if SYS_ify (syscall) < 256; \
+ svc SYS_ify (syscall); \
+ .else; \
+ lghi %r1,SYS_ify (syscall); \
+ svc 0; \
+ .endif
#define ret \
br 14
@@ -143,8 +148,8 @@
#undef INTERNAL_SYSCALL_DECL
#define INTERNAL_SYSCALL_DECL(err) do { } while (0)
-#undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL(name, err, nr, args...) \
+#undef INTERNAL_SYSCALL_DIRECT
+#define INTERNAL_SYSCALL_DIRECT(name, err, nr, args...) \
({ \
DECLARGS_##nr(args) \
register int _ret asm("2"); \
@@ -154,6 +159,25 @@
: "i" (__NR_##name) ASMFMT_##nr \
: "memory" ); \
_ret; })
+
+#undef INTERNAL_SYSCALL_SVC0
+#define INTERNAL_SYSCALL_SVC0(name, err, nr, args...) \
+ ({ \
+ DECLARGS_##nr(args) \
+ register unsigned long _nr asm("1") = (unsigned long)(__NR_##name); \
+ register int _ret asm("2"); \
+ asm volatile ( \
+ "svc 0\n\t" \
+ : "=d" (_ret) \
+ : "d" (_nr), "i" (__NR_##name) ASMFMT_##nr \
+ : "memory" ); \
+ _ret; })
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+ (((__NR_##name) < 256) ? \
+ INTERNAL_SYSCALL_DIRECT(name, err, nr, args) : \
+ INTERNAL_SYSCALL_SVC0(name, err,nr, args))
#undef INTERNAL_SYSCALL_ERROR_P
#define INTERNAL_SYSCALL_ERROR_P(val, err) \
next reply other threads:[~2003-03-03 14:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-03 14:30 Martin Schwidefsky [this message]
2003-03-03 18:32 ` Ulrich Drepper
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