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* [glibc] powerpc: Consolidate Linux syscall definition
@ 2020-02-15 0:13 Adhemerval Zanella
0 siblings, 0 replies; only message in thread
From: Adhemerval Zanella @ 2020-02-15 0:13 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cd72a13f22dbb56f56ed63e9899050cba7a286ad
commit cd72a13f22dbb56f56ed63e9899050cba7a286ad
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Thu Jan 30 19:13:31 2020 +0000
powerpc: Consolidate Linux syscall definition
The diferences between powerpc64{le} and powerpc32 Linux sysdep.h
are:
1. On both vDSO and syscall macros the volatile registers r9, r10,
r11, and r12 are used as input operands on powerpc32 and as
clobber registers on powerpc64. However the outcome is essentially
the same, it advertise the register might be clobbered by the
kernel (although Linux won't leak register information to userland
in such case).
2. The LOADARGS* macros uses a different size to check for invalid
types.
3. The pointer mangling support guard pointer loading uses ABI
specific instruction and register.
This patch consolidates on only one sysdep by using the the powerpc64
version as default and add the adjustments required for powerpc32.
Checked on powerpc64-linux-gnu, powerpc64le-linux-gnu, and
powerpc-linux-gnu-power4.
Diff:
---
sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h | 214 ---------------------
sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h | 196 +------------------
sysdeps/unix/sysv/linux/powerpc/sysdep.h | 208 +++++++++++++++++++-
3 files changed, 209 insertions(+), 409 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
deleted file mode 100644
index 725dfaf..0000000
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/sysdep.h
+++ /dev/null
@@ -1,214 +0,0 @@
-/* Copyright (C) 1992-2020 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <https://www.gnu.org/licenses/>. */
-
-#ifndef _LINUX_POWERPC_SYSDEP_H
-#define _LINUX_POWERPC_SYSDEP_H 1
-
-#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
-#include <sysdeps/unix/sysv/linux/sysdep.h>
-#include <sysdeps/unix/powerpc/sysdep.h>
-#include <tls.h>
-
-/* For Linux we can use the system call table in the header file
- /usr/include/asm/unistd.h
- of the kernel. But these symbols do not follow the SYS_* syntax
- so we have to redefine the `SYS_ify' macro here. */
-#undef SYS_ify
-#define SYS_ify(syscall_name) __NR_##syscall_name
-
-#ifndef __ASSEMBLER__
-
-# include <errno.h>
-
-/* Define a macro which expands inline into the wrapper code for a VDSO
- call. This use is for internal calls that do not need to handle errors
- normally. It will never touch errno.
- On powerpc a system call basically clobbers the same registers like a
- function call, with the exception of LR (which is needed for the
- "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
- an error return status). */
-# define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...) \
- ({ \
- register void *r0 __asm__ ("r0"); \
- register long int r3 __asm__ ("r3"); \
- register long int r4 __asm__ ("r4"); \
- register long int r5 __asm__ ("r5"); \
- register long int r6 __asm__ ("r6"); \
- register long int r7 __asm__ ("r7"); \
- register long int r8 __asm__ ("r8"); \
- register long int r9 __asm__ ("r9"); \
- register long int r10 __asm__ ("r10"); \
- register long int r11 __asm__ ("r11"); \
- register long int r12 __asm__ ("r12"); \
- register type rval __asm__ ("r3"); \
- LOADARGS_##nr (funcptr, args); \
- __asm__ __volatile__ \
- ("mtctr %0\n\t" \
- "bctrl\n\t" \
- "mfcr %0" \
- : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), "+r" (r7), \
- "+r" (r8), "+r" (r9), "+r" (r10), "+r" (r11), "+r" (r12) \
- : : "cr0", "ctr", "lr", "memory"); \
- err = (long int) r0; \
- __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3), "r" (r4)); \
- rval; \
- })
-
-#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
- INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
-
-# undef INLINE_SYSCALL
-# define INLINE_SYSCALL(name, nr, args...) \
- ({ \
- INTERNAL_SYSCALL_DECL (sc_err); \
- long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
- if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
- { \
- __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
- sc_ret = -1L; \
- } \
- sc_ret; \
- })
-
-/* Define a macro which expands inline into the wrapper code for a system
- call. This use is for internal calls that do not need to handle errors
- normally. It will never touch errno.
- On powerpc a system call basically clobbers the same registers like a
- function call, with the exception of LR (which is needed for the
- "sc; bnslr+" sequence) and CR (where only CR0.SO is clobbered to signal
- an error return status). */
-
-# undef INTERNAL_SYSCALL_DECL
-# define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
-
-# undef INTERNAL_SYSCALL
-# define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
- ({ \
- register long int r0 __asm__ ("r0"); \
- register long int r3 __asm__ ("r3"); \
- register long int r4 __asm__ ("r4"); \
- register long int r5 __asm__ ("r5"); \
- register long int r6 __asm__ ("r6"); \
- register long int r7 __asm__ ("r7"); \
- register long int r8 __asm__ ("r8"); \
- register long int r9 __asm__ ("r9"); \
- register long int r10 __asm__ ("r10"); \
- register long int r11 __asm__ ("r11"); \
- register long int r12 __asm__ ("r12"); \
- LOADARGS_##nr(name, args); \
- __asm__ __volatile__ \
- ("sc \n\t" \
- "mfcr %0" \
- : "=&r" (r0), \
- "=&r" (r3), "=&r" (r4), "=&r" (r5), "=&r" (r6), "=&r" (r7), \
- "=&r" (r8), "=&r" (r9), "=&r" (r10), "=&r" (r11), "=&r" (r12) \
- : ASM_INPUT_##nr \
- : "cr0", "ctr", "memory"); \
- err = r0; \
- (int) r3; \
- })
-# define INTERNAL_SYSCALL(name, err, nr, args...) \
- INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, ##args)
-
-# undef INTERNAL_SYSCALL_ERROR_P
-# define INTERNAL_SYSCALL_ERROR_P(val, err) \
- ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
-
-# undef INTERNAL_SYSCALL_ERRNO
-# define INTERNAL_SYSCALL_ERRNO(val, err) (val)
-
-# define LOADARGS_0(name, dummy) \
- r0 = name
-# define LOADARGS_1(name, __arg1) \
- long int arg1 = (long int) (__arg1); \
- LOADARGS_0(name, 0); \
- extern void __illegally_sized_syscall_arg1 (void); \
- if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 4) \
- __illegally_sized_syscall_arg1 (); \
- r3 = arg1
-# define LOADARGS_2(name, __arg1, __arg2) \
- long int arg2 = (long int) (__arg2); \
- LOADARGS_1(name, __arg1); \
- extern void __illegally_sized_syscall_arg2 (void); \
- if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 4) \
- __illegally_sized_syscall_arg2 (); \
- r4 = arg2
-# define LOADARGS_3(name, __arg1, __arg2, __arg3) \
- long int arg3 = (long int) (__arg3); \
- LOADARGS_2(name, __arg1, __arg2); \
- extern void __illegally_sized_syscall_arg3 (void); \
- if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 4) \
- __illegally_sized_syscall_arg3 (); \
- r5 = arg3
-# define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
- long int arg4 = (long int) (__arg4); \
- LOADARGS_3(name, __arg1, __arg2, __arg3); \
- extern void __illegally_sized_syscall_arg4 (void); \
- if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 4) \
- __illegally_sized_syscall_arg4 (); \
- r6 = arg4
-# define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
- long int arg5 = (long int) (__arg5); \
- LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
- extern void __illegally_sized_syscall_arg5 (void); \
- if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 4) \
- __illegally_sized_syscall_arg5 (); \
- r7 = arg5
-# define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
- long int arg6 = (long int) (__arg6); \
- LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
- extern void __illegally_sized_syscall_arg6 (void); \
- if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 4) \
- __illegally_sized_syscall_arg6 (); \
- r8 = arg6
-
-# define ASM_INPUT_0 "0" (r0)
-# define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
-# define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
-# define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
-# define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
-# define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
-# define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
-
-#endif /* __ASSEMBLER__ */
-
-
-/* Pointer mangling support. */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
- earlier than the descriptor is initialized. */
-#else
-# ifdef __ASSEMBLER__
-# define PTR_MANGLE(reg, tmpreg) \
- lwz tmpreg,POINTER_GUARD(r2); \
- xor reg,tmpreg,reg
-# define PTR_MANGLE2(reg, tmpreg) \
- xor reg,tmpreg,reg
-# define PTR_MANGLE3(destreg, reg, tmpreg) \
- lwz tmpreg,POINTER_GUARD(r2); \
- xor destreg,tmpreg,reg
-# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
-# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
-# else
-# define PTR_MANGLE(var) \
- (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-# define PTR_DEMANGLE(var) PTR_MANGLE (var)
-# endif
-#endif
-
-#endif /* linux/powerpc/powerpc32/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
index ee7f436..0d6b985 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/sysdep.h
@@ -17,202 +17,10 @@
/* Alan Modra <amodra@bigpond.net.au> rewrote the INLINE_SYSCALL macro */
-#ifndef _LINUX_POWERPC_SYSDEP_H
-#define _LINUX_POWERPC_SYSDEP_H 1
+#ifndef _LINUX_POWERPC64_SYSDEP_H
+#define _LINUX_POWERPC64_SYSDEP_H 1
#include <sysdeps/unix/sysv/linux/powerpc/sysdep.h>
-#include <sysdeps/unix/sysv/linux/sysdep.h>
-#include <sysdeps/unix/powerpc/sysdep.h>
-#include <tls.h>
-
-/* Define __set_errno() for INLINE_SYSCALL macro below. */
-#ifndef __ASSEMBLER__
-#include <errno.h>
-#endif
-
-/* For Linux we can use the system call table in the header file
- /usr/include/asm/unistd.h
- of the kernel. But these symbols do not follow the SYS_* syntax
- so we have to redefine the `SYS_ify' macro here. */
-#undef SYS_ify
-#define SYS_ify(syscall_name) __NR_##syscall_name
-
-#ifdef __ASSEMBLER__
-
-/* This seems to always be the case on PPC. */
-# define ALIGNARG(log2) log2
-# define ASM_SIZE_DIRECTIVE(name) .size name,.-name
-
-#endif /* __ASSEMBLER__ */
-
-/* Define a macro which expands inline into the wrapper code for a system
- call. This use is for internal calls that do not need to handle errors
- normally. It will never touch errno. This returns just what the kernel
- gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
- the negation of the return value in the kernel gets reverted. */
-
-#define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...) \
- ({ \
- register void *r0 __asm__ ("r0"); \
- register long int r3 __asm__ ("r3"); \
- register long int r4 __asm__ ("r4"); \
- register long int r5 __asm__ ("r5"); \
- register long int r6 __asm__ ("r6"); \
- register long int r7 __asm__ ("r7"); \
- register long int r8 __asm__ ("r8"); \
- register type rval __asm__ ("r3"); \
- LOADARGS_##nr (funcptr, args); \
- __asm__ __volatile__ \
- ("mtctr %0\n\t" \
- "bctrl\n\t" \
- "mfcr %0\n\t" \
- "0:" \
- : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), \
- "+r" (r7), "+r" (r8) \
- : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory"); \
- err = (long int) r0; \
- __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3)); \
- rval; \
- })
-
-#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
- INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
-
-/* This version is for kernels that implement system calls that
- behave like function calls as far as register saving. */
-#undef INLINE_SYSCALL
-#define INLINE_SYSCALL(name, nr, args...) \
- ({ \
- INTERNAL_SYSCALL_DECL (sc_err); \
- long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
- if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
- { \
- __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
- sc_ret = -1L; \
- } \
- sc_ret; \
- })
-
-/* Define a macro which expands inline into the wrapper code for a system
- call. This use is for internal calls that do not need to handle errors
- normally. It will never touch errno. This returns just what the kernel
- gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
- the negation of the return value in the kernel gets reverted. */
-
-#undef INTERNAL_SYSCALL
-#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
- ({ \
- register long int r0 __asm__ ("r0"); \
- register long int r3 __asm__ ("r3"); \
- register long int r4 __asm__ ("r4"); \
- register long int r5 __asm__ ("r5"); \
- register long int r6 __asm__ ("r6"); \
- register long int r7 __asm__ ("r7"); \
- register long int r8 __asm__ ("r8"); \
- LOADARGS_##nr (name, ##args); \
- __asm__ __volatile__ \
- ("sc\n\t" \
- "mfcr %0\n\t" \
- "0:" \
- : "=&r" (r0), \
- "=&r" (r3), "=&r" (r4), "=&r" (r5), \
- "=&r" (r6), "=&r" (r7), "=&r" (r8) \
- : ASM_INPUT_##nr \
- : "r9", "r10", "r11", "r12", \
- "cr0", "ctr", "memory"); \
- err = r0; \
- r3; \
- })
-#define INTERNAL_SYSCALL(name, err, nr, args...) \
- INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, args)
-
-#undef INTERNAL_SYSCALL_DECL
-#define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
-
-#undef INTERNAL_SYSCALL_ERROR_P
-#define INTERNAL_SYSCALL_ERROR_P(val, err) \
- ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
-
-#undef INTERNAL_SYSCALL_ERRNO
-#define INTERNAL_SYSCALL_ERRNO(val, err) (val)
-
-#define LOADARGS_0(name, dummy) \
- r0 = name
-#define LOADARGS_1(name, __arg1) \
- long int arg1 = (long int) (__arg1); \
- LOADARGS_0(name, 0); \
- extern void __illegally_sized_syscall_arg1 (void); \
- if (__builtin_classify_type (__arg1) != 5 && sizeof (__arg1) > 8) \
- __illegally_sized_syscall_arg1 (); \
- r3 = arg1
-#define LOADARGS_2(name, __arg1, __arg2) \
- long int arg2 = (long int) (__arg2); \
- LOADARGS_1(name, __arg1); \
- extern void __illegally_sized_syscall_arg2 (void); \
- if (__builtin_classify_type (__arg2) != 5 && sizeof (__arg2) > 8) \
- __illegally_sized_syscall_arg2 (); \
- r4 = arg2
-#define LOADARGS_3(name, __arg1, __arg2, __arg3) \
- long int arg3 = (long int) (__arg3); \
- LOADARGS_2(name, __arg1, __arg2); \
- extern void __illegally_sized_syscall_arg3 (void); \
- if (__builtin_classify_type (__arg3) != 5 && sizeof (__arg3) > 8) \
- __illegally_sized_syscall_arg3 (); \
- r5 = arg3
-#define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
- long int arg4 = (long int) (__arg4); \
- LOADARGS_3(name, __arg1, __arg2, __arg3); \
- extern void __illegally_sized_syscall_arg4 (void); \
- if (__builtin_classify_type (__arg4) != 5 && sizeof (__arg4) > 8) \
- __illegally_sized_syscall_arg4 (); \
- r6 = arg4
-#define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
- long int arg5 = (long int) (__arg5); \
- LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
- extern void __illegally_sized_syscall_arg5 (void); \
- if (__builtin_classify_type (__arg5) != 5 && sizeof (__arg5) > 8) \
- __illegally_sized_syscall_arg5 (); \
- r7 = arg5
-#define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
- long int arg6 = (long int) (__arg6); \
- LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
- extern void __illegally_sized_syscall_arg6 (void); \
- if (__builtin_classify_type (__arg6) != 5 && sizeof (__arg6) > 8) \
- __illegally_sized_syscall_arg6 (); \
- r8 = arg6
-
-#define ASM_INPUT_0 "0" (r0)
-#define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
-#define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
-#define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
-#define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
-#define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
-#define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
-
-
-/* Pointer mangling support. */
-#if IS_IN (rtld)
-/* We cannot use the thread descriptor because in ld.so we use setjmp
- earlier than the descriptor is initialized. */
-#else
-# ifdef __ASSEMBLER__
-# define PTR_MANGLE(reg, tmpreg) \
- ld tmpreg,POINTER_GUARD(r13); \
- xor reg,tmpreg,reg
-# define PTR_MANGLE2(reg, tmpreg) \
- xor reg,tmpreg,reg
-# define PTR_MANGLE3(destreg, reg, tmpreg) \
- ld tmpreg,POINTER_GUARD(r13); \
- xor destreg,tmpreg,reg
-# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
-# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
-# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
-# else
-# define PTR_MANGLE(var) \
- (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
-# define PTR_DEMANGLE(var) PTR_MANGLE (var)
-# endif
-#endif
/* In the PowerPC64 ABI, the unadorned F_GETLK* opcodes should be used
even by largefile64 code. */
diff --git a/sysdeps/unix/sysv/linux/powerpc/sysdep.h b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
index 1f477a9..0f067db 100644
--- a/sysdeps/unix/sysv/linux/powerpc/sysdep.h
+++ b/sysdeps/unix/sysv/linux/powerpc/sysdep.h
@@ -16,10 +16,214 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#ifndef _LINUX_POWERPC_SYSDEP_H
+#define _LINUX_POWERPC_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/sysdep.h>
+#include <sysdeps/unix/powerpc/sysdep.h>
+#include <tls.h>
+/* Define __set_errno() for INLINE_SYSCALL macro below. */
+#include <errno.h>
+
+/* For Linux we can use the system call table in the header file
+ /usr/include/asm/unistd.h
+ of the kernel. But these symbols do not follow the SYS_* syntax
+ so we have to redefine the `SYS_ify' macro here. */
+#undef SYS_ify
+#define SYS_ify(syscall_name) __NR_##syscall_name
+
+/* Define a macro which expands inline into the wrapper code for a system
+ call. This use is for internal calls that do not need to handle errors
+ normally. It will never touch errno. This returns just what the kernel
+ gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
+ the negation of the return value in the kernel gets reverted. */
+
+#define INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, type, nr, args...) \
+ ({ \
+ register void *r0 __asm__ ("r0"); \
+ register long int r3 __asm__ ("r3"); \
+ register long int r4 __asm__ ("r4"); \
+ register long int r5 __asm__ ("r5"); \
+ register long int r6 __asm__ ("r6"); \
+ register long int r7 __asm__ ("r7"); \
+ register long int r8 __asm__ ("r8"); \
+ register type rval __asm__ ("r3"); \
+ LOADARGS_##nr (funcptr, args); \
+ __asm__ __volatile__ \
+ ("mtctr %0\n\t" \
+ "bctrl\n\t" \
+ "mfcr %0\n\t" \
+ "0:" \
+ : "+r" (r0), "+r" (r3), "+r" (r4), "+r" (r5), "+r" (r6), \
+ "+r" (r7), "+r" (r8) \
+ : : "r9", "r10", "r11", "r12", "cr0", "ctr", "lr", "memory"); \
+ err = (long int) r0; \
+ __asm__ __volatile__ ("" : "=r" (rval) : "r" (r3)); \
+ rval; \
+ })
+
+#define INTERNAL_VSYSCALL_CALL(funcptr, err, nr, args...) \
+ INTERNAL_VSYSCALL_CALL_TYPE(funcptr, err, long int, nr, args)
+
+/* This version is for kernels that implement system calls that
+ behave like function calls as far as register saving. */
+#undef INLINE_SYSCALL
+#define INLINE_SYSCALL(name, nr, args...) \
+ ({ \
+ INTERNAL_SYSCALL_DECL (sc_err); \
+ long int sc_ret = INTERNAL_SYSCALL (name, sc_err, nr, args); \
+ if (INTERNAL_SYSCALL_ERROR_P (sc_ret, sc_err)) \
+ { \
+ __set_errno (INTERNAL_SYSCALL_ERRNO (sc_ret, sc_err)); \
+ sc_ret = -1L; \
+ } \
+ sc_ret; \
+ })
+
+/* Define a macro which expands inline into the wrapper code for a system
+ call. This use is for internal calls that do not need to handle errors
+ normally. It will never touch errno. This returns just what the kernel
+ gave back in the non-error (CR0.SO cleared) case, otherwise (CR0.SO set)
+ the negation of the return value in the kernel gets reverted. */
+
+#undef INTERNAL_SYSCALL
+#define INTERNAL_SYSCALL_NCS(name, err, nr, args...) \
+ ({ \
+ register long int r0 __asm__ ("r0"); \
+ register long int r3 __asm__ ("r3"); \
+ register long int r4 __asm__ ("r4"); \
+ register long int r5 __asm__ ("r5"); \
+ register long int r6 __asm__ ("r6"); \
+ register long int r7 __asm__ ("r7"); \
+ register long int r8 __asm__ ("r8"); \
+ LOADARGS_##nr (name, ##args); \
+ __asm__ __volatile__ \
+ ("sc\n\t" \
+ "mfcr %0\n\t" \
+ "0:" \
+ : "=&r" (r0), \
+ "=&r" (r3), "=&r" (r4), "=&r" (r5), \
+ "=&r" (r6), "=&r" (r7), "=&r" (r8) \
+ : ASM_INPUT_##nr \
+ : "r9", "r10", "r11", "r12", \
+ "cr0", "ctr", "memory"); \
+ err = r0; \
+ r3; \
+ })
+#define INTERNAL_SYSCALL(name, err, nr, args...) \
+ INTERNAL_SYSCALL_NCS (__NR_##name, err, nr, args)
+
+#undef INTERNAL_SYSCALL_DECL
+#define INTERNAL_SYSCALL_DECL(err) long int err __attribute__ ((unused))
+
+#undef INTERNAL_SYSCALL_ERROR_P
+#define INTERNAL_SYSCALL_ERROR_P(val, err) \
+ ((void) (val), __builtin_expect ((err) & (1 << 28), 0))
+
+#undef INTERNAL_SYSCALL_ERRNO
+#define INTERNAL_SYSCALL_ERRNO(val, err) (val)
+
+#if defined(__PPC64__) || defined(__powerpc64__)
+# define SYSCALL_ARG_SIZE 8
+#else
+# define SYSCALL_ARG_SIZE 4
+#endif
+
+#define LOADARGS_0(name, dummy) \
+ r0 = name
+#define LOADARGS_1(name, __arg1) \
+ long int arg1 = (long int) (__arg1); \
+ LOADARGS_0(name, 0); \
+ extern void __illegally_sized_syscall_arg1 (void); \
+ if (__builtin_classify_type (__arg1) != 5 \
+ && sizeof (__arg1) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg1 (); \
+ r3 = arg1
+#define LOADARGS_2(name, __arg1, __arg2) \
+ long int arg2 = (long int) (__arg2); \
+ LOADARGS_1(name, __arg1); \
+ extern void __illegally_sized_syscall_arg2 (void); \
+ if (__builtin_classify_type (__arg2) != 5 \
+ && sizeof (__arg2) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg2 (); \
+ r4 = arg2
+#define LOADARGS_3(name, __arg1, __arg2, __arg3) \
+ long int arg3 = (long int) (__arg3); \
+ LOADARGS_2(name, __arg1, __arg2); \
+ extern void __illegally_sized_syscall_arg3 (void); \
+ if (__builtin_classify_type (__arg3) != 5 \
+ && sizeof (__arg3) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg3 (); \
+ r5 = arg3
+#define LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4) \
+ long int arg4 = (long int) (__arg4); \
+ LOADARGS_3(name, __arg1, __arg2, __arg3); \
+ extern void __illegally_sized_syscall_arg4 (void); \
+ if (__builtin_classify_type (__arg4) != 5 \
+ && sizeof (__arg4) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg4 (); \
+ r6 = arg4
+#define LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5) \
+ long int arg5 = (long int) (__arg5); \
+ LOADARGS_4(name, __arg1, __arg2, __arg3, __arg4); \
+ extern void __illegally_sized_syscall_arg5 (void); \
+ if (__builtin_classify_type (__arg5) != 5 \
+ && sizeof (__arg5) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg5 (); \
+ r7 = arg5
+#define LOADARGS_6(name, __arg1, __arg2, __arg3, __arg4, __arg5, __arg6) \
+ long int arg6 = (long int) (__arg6); \
+ LOADARGS_5(name, __arg1, __arg2, __arg3, __arg4, __arg5); \
+ extern void __illegally_sized_syscall_arg6 (void); \
+ if (__builtin_classify_type (__arg6) != 5 \
+ && sizeof (__arg6) > SYSCALL_ARG_SIZE) \
+ __illegally_sized_syscall_arg6 (); \
+ r8 = arg6
+
+#define ASM_INPUT_0 "0" (r0)
+#define ASM_INPUT_1 ASM_INPUT_0, "1" (r3)
+#define ASM_INPUT_2 ASM_INPUT_1, "2" (r4)
+#define ASM_INPUT_3 ASM_INPUT_2, "3" (r5)
+#define ASM_INPUT_4 ASM_INPUT_3, "4" (r6)
+#define ASM_INPUT_5 ASM_INPUT_4, "5" (r7)
+#define ASM_INPUT_6 ASM_INPUT_5, "6" (r8)
+
+
+/* Pointer mangling support. */
+#if IS_IN (rtld)
+/* We cannot use the thread descriptor because in ld.so we use setjmp
+ earlier than the descriptor is initialized. */
+#else
+# ifdef __ASSEMBLER__
+# if defined(__PPC64__) || defined(__powerpc64__)
+# define LOAD ld
+# define TPREG r13
+# else
+# define LOAD lwz
+# define TPREG r2
+# endif
+# define PTR_MANGLE(reg, tmpreg) \
+ LOAD tmpreg,POINTER_GUARD(TPREG); \
+ xor reg,tmpreg,reg
+# define PTR_MANGLE2(reg, tmpreg) \
+ xor reg,tmpreg,reg
+# define PTR_MANGLE3(destreg, reg, tmpreg) \
+ LOAD tmpreg,POINTER_GUARD(TPREG); \
+ xor destreg,tmpreg,reg
+# define PTR_DEMANGLE(reg, tmpreg) PTR_MANGLE (reg, tmpreg)
+# define PTR_DEMANGLE2(reg, tmpreg) PTR_MANGLE2 (reg, tmpreg)
+# define PTR_DEMANGLE3(destreg, reg, tmpreg) PTR_MANGLE3 (destreg, reg, tmpreg)
+# else
+# define PTR_MANGLE(var) \
+ (var) = (__typeof (var)) ((uintptr_t) (var) ^ THREAD_GET_POINTER_GUARD ())
+# define PTR_DEMANGLE(var) PTR_MANGLE (var)
+# endif
+#endif
+
+/* List of system calls which are supported as vsyscalls. */
#define VDSO_NAME "LINUX_2.6.15"
#define VDSO_HASH 123718565
-/* List of system calls which are supported as vsyscalls. */
#if defined(__PPC64__) || defined(__powerpc64__)
#define HAVE_CLOCK_GETRES64_VSYSCALL "__kernel_clock_getres"
#define HAVE_CLOCK_GETTIME64_VSYSCALL "__kernel_clock_gettime"
@@ -38,3 +242,5 @@
# define HAVE_SIGTRAMP_32 "__kernel_sigtramp32"
# define HAVE_SIGTRAMP_RT32 "__kernel_sigtramp_rt32"
#endif
+
+#endif /* _LINUX_POWERPC_SYSDEP_H */
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2020-02-15 0:13 [glibc] powerpc: Consolidate Linux syscall definition Adhemerval Zanella
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