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* [glibc/arm/morello/main] aarch64: morello: add purecap syscall support
@ 2022-08-05 19:32 Szabolcs Nagy
0 siblings, 0 replies; 4+ messages in thread
From: Szabolcs Nagy @ 2022-08-05 19:32 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=ff371935db74c2d387b18a98e65181f615c69d62
commit ff371935db74c2d387b18a98e65181f615c69d62
Author: Carlos Eduardo Seo <carlos.seo@arm.com>
Date: Thu Apr 8 12:49:27 2021 -0300
aarch64: morello: add purecap syscall support
Support the Morello Linux purecap syscall ABI. The macro definitions
are moved to a morello specific sysdep.h to avoid cluttering the
aarch64 one.
Diff:
---
sysdeps/unix/sysv/linux/aarch64/clone.S | 68 +++++++++----
sysdeps/unix/sysv/linux/aarch64/ioctl.S | 5 +
sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h | 116 +++++++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/syscall.S | 12 +++
4 files changed, 185 insertions(+), 16 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index ad80ac829c..663853ab4a 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -23,41 +23,77 @@
#define _ERRNO_H 1
#include <bits/errno.h>
-/* int clone(int (*fn)(void *arg), x0
- void *child_stack, x1
- int flags, x2
- void *arg, x3
- pid_t *ptid, x4
- struct user_desc *tls, x5
- pid_t *ctid); x6
+#ifdef __CHERI_PURE_CAPABILITY__
+# define arg0 c0
+# define arg1 c1
+# define arg2 c2
+# define arg3 c3
+# define arg4 c4
+# define arg5 c5
+# define arg6 c6
+# define tmp0 c10
+# define tmp1 c11
+# define tmp2 c12
+#else
+# define arg0 x0
+# define arg1 x1
+# define arg2 x2
+# define arg3 x3
+# define arg4 x4
+# define arg5 x5
+# define arg6 x6
+# define tmp0 x10
+# define tmp1 x11
+# define tmp2 x12
+#endif
+
+/* int clone(int (*fn)(void *arg), arg0
+ void *child_stack, arg1
+ int flags, arg2
+ void *arg, arg3
+ pid_t *ptid, arg4
+ struct user_desc *tls, arg5
+ pid_t *ctid); arg6
*/
.text
ENTRY(__clone)
+#ifndef __CHERI_PURE_CAPABILITY__
PTR_ARG (0)
PTR_ARG (1)
PTR_ARG (3)
PTR_ARG (4)
PTR_ARG (5)
PTR_ARG (6)
+#else
+ cbz x9, L(skip_args)
+ ldr c4, [c9]
+ ldr c5, [c9,16]
+ ldr c6, [c9,32]
+L(skip_args):
+#endif
/* Save args for the child. */
- mov x10, x0
- mov x11, x2
- mov x12, x3
+ mov tmp0, arg0
+ mov tmp1, arg2
+ mov tmp2, arg3
/* Sanity check args. */
mov x0, #-EINVAL
cbz x10, .Lsyscall_error
/* Align sp. */
+#ifndef __CHERI_PURE_CAPABILITY__
and x1, x1, -16
+#else
+ alignd c1, c1, 4
+#endif
cbz x1, .Lsyscall_error
/* Do the system call. */
/* X0:flags, x1:newsp, x2:parenttidptr, x3:newtls, x4:childtid. */
- mov x0, x2 /* flags */
+ mov arg0, arg2 /* flags */
/* New sp is already in x1. */
- mov x2, x4 /* ptid */
- mov x3, x5 /* tls */
- mov x4, x6 /* ctid */
+ mov arg2, arg4 /* ptid */
+ mov arg3, arg5 /* tls */
+ mov arg4, arg6 /* ctid */
mov x8, #SYS_ify(clone)
svc 0x0
@@ -75,8 +111,8 @@ thread_start:
mov x29, 0
/* Pick the function arg and execute. */
- mov x0, x12
- blr x10
+ mov arg0, tmp2
+ blr tmp0
/* We are done, pass the return value through x0. */
mov x8, #SYS_ify(exit)
diff --git a/sysdeps/unix/sysv/linux/aarch64/ioctl.S b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
index eb2f7211d7..88c8143452 100644
--- a/sysdeps/unix/sysv/linux/aarch64/ioctl.S
+++ b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
@@ -22,6 +22,11 @@
ENTRY(__ioctl)
mov x8, #__NR_ioctl
sxtw x0, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_arg3)
+ ldr c2, [c9]
+L(skip_arg3):
+#endif
svc #0x0
cmn x0, #4095
b.cs .Lsyscall_error
diff --git a/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
new file mode 100644
index 0000000000..5db89b096d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
@@ -0,0 +1,116 @@
+/* Copyright (C) 2022 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_AARCH64_MORELLO_SYSDEP_H
+#define _LINUX_AARCH64_MORELLO_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/aarch64/sysdep.h>
+
+#ifdef __ASSEMBLER__
+# if !IS_IN (libc)
+# undef SYSCALL_ERROR_HANDLER
+# if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w0, w0; \
+ adrp c1, :got:rtld_errno; \
+ ldr c1, [c1, :got_lo12:rtld_errno]; \
+ str w0, [c1]; \
+ mov x0, -1; \
+ RET;
+# else
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w4, w0; \
+ adrp c1, :gottprel:errno; \
+ add c1, c1, :gottprel_lo12:errno; \
+ ldp x1, x2, [c1]; \
+ mrs c3, ctpidr_el0; \
+ add c1, c3, x1, uxtx; \
+ scbnds c1, c1, x2; \
+ mov x0, -1; \
+ str w4, [c1]; \
+ RET;
+# endif
+# endif
+
+#else /* not __ASSEMBLER__ */
+
+typedef __intcap_t __sysarg_t;
+
+# undef INTERNAL_SYSCALL_RAW
+# define INTERNAL_SYSCALL_RAW(name, nr, args...) \
+ ({ __sysarg_t _sys_result; \
+ { \
+ LOAD_ARGS_##nr (args) \
+ register long _x8 asm ("x8") = (name); \
+ asm volatile ("svc 0 // syscall " # name \
+ : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \
+ _sys_result = _x0; \
+ } \
+ _sys_result; })
+
+# undef LOAD_ARGS_0
+# undef LOAD_ARGS_1
+# undef LOAD_ARGS_2
+# undef LOAD_ARGS_3
+# undef LOAD_ARGS_4
+# undef LOAD_ARGS_5
+# undef LOAD_ARGS_6
+# undef LOAD_ARGS_7
+
+# define LOAD_ARGS_0() \
+ register __sysarg_t _x0 asm ("c0");
+# define LOAD_ARGS_1(c0) \
+ __sysarg_t _x0tmp = (__sysarg_t) (c0); \
+ LOAD_ARGS_0 () \
+ _x0 = _x0tmp;
+# define LOAD_ARGS_2(c0, c1) \
+ __sysarg_t _x1tmp = (__sysarg_t) (c1); \
+ LOAD_ARGS_1 (c0) \
+ register __sysarg_t _x1 asm ("c1") = _x1tmp;
+# define LOAD_ARGS_3(c0, c1, c2) \
+ __sysarg_t _x2tmp = (__sysarg_t) (c2); \
+ LOAD_ARGS_2 (c0, c1) \
+ register __sysarg_t _x2 asm ("c2") = _x2tmp;
+# define LOAD_ARGS_4(c0, c1, c2, c3) \
+ __sysarg_t _x3tmp = (__sysarg_t) (c3); \
+ LOAD_ARGS_3 (c0, c1, c2) \
+ register __sysarg_t _x3 asm ("c3") = _x3tmp;
+# define LOAD_ARGS_5(c0, c1, c2, c3, c4) \
+ __sysarg_t _x4tmp = (__sysarg_t) (c4); \
+ LOAD_ARGS_4 (c0, c1, c2, c3) \
+ register __sysarg_t _x4 asm ("c4") = _x4tmp;
+# define LOAD_ARGS_6(c0, c1, c2, c3, c4, c5) \
+ __sysarg_t _x5tmp = (__sysarg_t) (c5); \
+ LOAD_ARGS_5 (c0, c1, c2, c3, c4) \
+ register __sysarg_t _x5 asm ("c5") = _x5tmp;
+# define LOAD_ARGS_7(c0, c1, c2, c3, c4, c5, c6)\
+ __sysarg_t _x6tmp = (__sysarg_t) (x6); \
+ LOAD_ARGS_6 (c0, c1, c2, c3, c4, c5) \
+ register __sysarg_t _x6 asm ("c6") = _x6tmp;
+
+#endif /* __ASSEMBLER__ */
+
+/* Disable pointer mangling for purecap ABI. */
+#undef PTR_MANGLE
+#undef PTR_MANGLE2
+#undef PTR_DEMANGLE
+#undef PTR_DEMANGLE2
+
+#endif /* linux/aarch64/morello/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/aarch64/syscall.S b/sysdeps/unix/sysv/linux/aarch64/syscall.S
index 9ddecb21c3..ec4688433d 100644
--- a/sysdeps/unix/sysv/linux/aarch64/syscall.S
+++ b/sysdeps/unix/sysv/linux/aarch64/syscall.S
@@ -28,6 +28,17 @@
ENTRY (syscall)
uxtw x8, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_args)
+ ldr c0, [c9]
+ ldr c1, [c9,16]
+ ldr c2, [c9,32]
+ ldr c3, [c9,48]
+ ldr c4, [c9,64]
+ ldr c5, [c9,80]
+ ldr c6, [c9,96]
+L(skip_args):
+#else
mov x0, x1
mov x1, x2
mov x2, x3
@@ -35,6 +46,7 @@ ENTRY (syscall)
mov x4, x5
mov x5, x6
mov x6, x7
+#endif
svc 0x0
cmn x0, #4095
b.cs 1f
^ permalink raw reply [flat|nested] 4+ messages in thread
* [glibc/arm/morello/main] aarch64: morello: add purecap syscall support
@ 2022-11-23 14:43 Szabolcs Nagy
0 siblings, 0 replies; 4+ messages in thread
From: Szabolcs Nagy @ 2022-11-23 14:43 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=6642c4177961ad087feafd17d766f2570e25d676
commit 6642c4177961ad087feafd17d766f2570e25d676
Author: Carlos Eduardo Seo <carlos.seo@arm.com>
Date: Thu Apr 8 12:49:27 2021 -0300
aarch64: morello: add purecap syscall support
Support the Morello Linux purecap syscall ABI. The macro definitions
are moved to a morello specific sysdep.h to avoid cluttering the
aarch64 one.
Diff:
---
sysdeps/unix/sysv/linux/aarch64/clone.S | 73 ++++++++++----
sysdeps/unix/sysv/linux/aarch64/ioctl.S | 5 +
sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h | 116 +++++++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/syscall.S | 25 +++++
4 files changed, 203 insertions(+), 16 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index ad80ac829c..4d7852304b 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -23,41 +23,82 @@
#define _ERRNO_H 1
#include <bits/errno.h>
-/* int clone(int (*fn)(void *arg), x0
- void *child_stack, x1
- int flags, x2
- void *arg, x3
- pid_t *ptid, x4
- struct user_desc *tls, x5
- pid_t *ctid); x6
+#ifdef __CHERI_PURE_CAPABILITY__
+# define arg0 c0
+# define arg1 c1
+# define arg2 c2
+# define arg3 c3
+# define arg4 c4
+# define arg5 c5
+# define arg6 c6
+# define tmp0 c10
+# define tmp1 c11
+# define tmp2 c12
+#else
+# define arg0 x0
+# define arg1 x1
+# define arg2 x2
+# define arg3 x3
+# define arg4 x4
+# define arg5 x5
+# define arg6 x6
+# define tmp0 x10
+# define tmp1 x11
+# define tmp2 x12
+#endif
+
+/* int clone(int (*fn)(void *arg), arg0
+ void *child_stack, arg1
+ int flags, arg2
+ void *arg, arg3
+ pid_t *ptid, arg4
+ struct user_desc *tls, arg5
+ pid_t *ctid); arg6
*/
.text
ENTRY(__clone)
+#ifndef __CHERI_PURE_CAPABILITY__
PTR_ARG (0)
PTR_ARG (1)
PTR_ARG (3)
PTR_ARG (4)
PTR_ARG (5)
PTR_ARG (6)
+#else
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c4, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c5, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c6, [c9,32]
+L(skip_args):
+#endif
/* Save args for the child. */
- mov x10, x0
- mov x11, x2
- mov x12, x3
+ mov tmp0, arg0
+ mov tmp1, arg2
+ mov tmp2, arg3
/* Sanity check args. */
mov x0, #-EINVAL
cbz x10, .Lsyscall_error
/* Align sp. */
+#ifndef __CHERI_PURE_CAPABILITY__
and x1, x1, -16
+#else
+ alignd c1, c1, 4
+#endif
cbz x1, .Lsyscall_error
/* Do the system call. */
/* X0:flags, x1:newsp, x2:parenttidptr, x3:newtls, x4:childtid. */
- mov x0, x2 /* flags */
+ mov arg0, arg2 /* flags */
/* New sp is already in x1. */
- mov x2, x4 /* ptid */
- mov x3, x5 /* tls */
- mov x4, x6 /* ctid */
+ mov arg2, arg4 /* ptid */
+ mov arg3, arg5 /* tls */
+ mov arg4, arg6 /* ctid */
mov x8, #SYS_ify(clone)
svc 0x0
@@ -75,8 +116,8 @@ thread_start:
mov x29, 0
/* Pick the function arg and execute. */
- mov x0, x12
- blr x10
+ mov arg0, tmp2
+ blr tmp0
/* We are done, pass the return value through x0. */
mov x8, #SYS_ify(exit)
diff --git a/sysdeps/unix/sysv/linux/aarch64/ioctl.S b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
index eb2f7211d7..88c8143452 100644
--- a/sysdeps/unix/sysv/linux/aarch64/ioctl.S
+++ b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
@@ -22,6 +22,11 @@
ENTRY(__ioctl)
mov x8, #__NR_ioctl
sxtw x0, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_arg3)
+ ldr c2, [c9]
+L(skip_arg3):
+#endif
svc #0x0
cmn x0, #4095
b.cs .Lsyscall_error
diff --git a/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
new file mode 100644
index 0000000000..5db89b096d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
@@ -0,0 +1,116 @@
+/* Copyright (C) 2022 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_AARCH64_MORELLO_SYSDEP_H
+#define _LINUX_AARCH64_MORELLO_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/aarch64/sysdep.h>
+
+#ifdef __ASSEMBLER__
+# if !IS_IN (libc)
+# undef SYSCALL_ERROR_HANDLER
+# if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w0, w0; \
+ adrp c1, :got:rtld_errno; \
+ ldr c1, [c1, :got_lo12:rtld_errno]; \
+ str w0, [c1]; \
+ mov x0, -1; \
+ RET;
+# else
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w4, w0; \
+ adrp c1, :gottprel:errno; \
+ add c1, c1, :gottprel_lo12:errno; \
+ ldp x1, x2, [c1]; \
+ mrs c3, ctpidr_el0; \
+ add c1, c3, x1, uxtx; \
+ scbnds c1, c1, x2; \
+ mov x0, -1; \
+ str w4, [c1]; \
+ RET;
+# endif
+# endif
+
+#else /* not __ASSEMBLER__ */
+
+typedef __intcap_t __sysarg_t;
+
+# undef INTERNAL_SYSCALL_RAW
+# define INTERNAL_SYSCALL_RAW(name, nr, args...) \
+ ({ __sysarg_t _sys_result; \
+ { \
+ LOAD_ARGS_##nr (args) \
+ register long _x8 asm ("x8") = (name); \
+ asm volatile ("svc 0 // syscall " # name \
+ : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \
+ _sys_result = _x0; \
+ } \
+ _sys_result; })
+
+# undef LOAD_ARGS_0
+# undef LOAD_ARGS_1
+# undef LOAD_ARGS_2
+# undef LOAD_ARGS_3
+# undef LOAD_ARGS_4
+# undef LOAD_ARGS_5
+# undef LOAD_ARGS_6
+# undef LOAD_ARGS_7
+
+# define LOAD_ARGS_0() \
+ register __sysarg_t _x0 asm ("c0");
+# define LOAD_ARGS_1(c0) \
+ __sysarg_t _x0tmp = (__sysarg_t) (c0); \
+ LOAD_ARGS_0 () \
+ _x0 = _x0tmp;
+# define LOAD_ARGS_2(c0, c1) \
+ __sysarg_t _x1tmp = (__sysarg_t) (c1); \
+ LOAD_ARGS_1 (c0) \
+ register __sysarg_t _x1 asm ("c1") = _x1tmp;
+# define LOAD_ARGS_3(c0, c1, c2) \
+ __sysarg_t _x2tmp = (__sysarg_t) (c2); \
+ LOAD_ARGS_2 (c0, c1) \
+ register __sysarg_t _x2 asm ("c2") = _x2tmp;
+# define LOAD_ARGS_4(c0, c1, c2, c3) \
+ __sysarg_t _x3tmp = (__sysarg_t) (c3); \
+ LOAD_ARGS_3 (c0, c1, c2) \
+ register __sysarg_t _x3 asm ("c3") = _x3tmp;
+# define LOAD_ARGS_5(c0, c1, c2, c3, c4) \
+ __sysarg_t _x4tmp = (__sysarg_t) (c4); \
+ LOAD_ARGS_4 (c0, c1, c2, c3) \
+ register __sysarg_t _x4 asm ("c4") = _x4tmp;
+# define LOAD_ARGS_6(c0, c1, c2, c3, c4, c5) \
+ __sysarg_t _x5tmp = (__sysarg_t) (c5); \
+ LOAD_ARGS_5 (c0, c1, c2, c3, c4) \
+ register __sysarg_t _x5 asm ("c5") = _x5tmp;
+# define LOAD_ARGS_7(c0, c1, c2, c3, c4, c5, c6)\
+ __sysarg_t _x6tmp = (__sysarg_t) (x6); \
+ LOAD_ARGS_6 (c0, c1, c2, c3, c4, c5) \
+ register __sysarg_t _x6 asm ("c6") = _x6tmp;
+
+#endif /* __ASSEMBLER__ */
+
+/* Disable pointer mangling for purecap ABI. */
+#undef PTR_MANGLE
+#undef PTR_MANGLE2
+#undef PTR_DEMANGLE
+#undef PTR_DEMANGLE2
+
+#endif /* linux/aarch64/morello/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/aarch64/syscall.S b/sysdeps/unix/sysv/linux/aarch64/syscall.S
index 9ddecb21c3..43a81fc248 100644
--- a/sysdeps/unix/sysv/linux/aarch64/syscall.S
+++ b/sysdeps/unix/sysv/linux/aarch64/syscall.S
@@ -28,6 +28,30 @@
ENTRY (syscall)
uxtw x8, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c0, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c1, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c2, [c9,32]
+ cmp x10, 48
+ bls L(skip_args)
+ ldr c3, [c9,48]
+ cmp x10, 64
+ bls L(skip_args)
+ ldr c4, [c9,64]
+ cmp x10, 80
+ bls L(skip_args)
+ ldr c5, [c9,80]
+ cmp x10, 96
+ bls L(skip_args)
+ ldr c6, [c9,96]
+L(skip_args):
+#else
mov x0, x1
mov x1, x2
mov x2, x3
@@ -35,6 +59,7 @@ ENTRY (syscall)
mov x4, x5
mov x5, x6
mov x6, x7
+#endif
svc 0x0
cmn x0, #4095
b.cs 1f
^ permalink raw reply [flat|nested] 4+ messages in thread
* [glibc/arm/morello/main] aarch64: morello: add purecap syscall support
@ 2022-10-27 13:53 Szabolcs Nagy
0 siblings, 0 replies; 4+ messages in thread
From: Szabolcs Nagy @ 2022-10-27 13:53 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=da5efab4bff77727f76e035778acc60338d54c34
commit da5efab4bff77727f76e035778acc60338d54c34
Author: Carlos Eduardo Seo <carlos.seo@arm.com>
Date: Thu Apr 8 12:49:27 2021 -0300
aarch64: morello: add purecap syscall support
Support the Morello Linux purecap syscall ABI. The macro definitions
are moved to a morello specific sysdep.h to avoid cluttering the
aarch64 one.
Diff:
---
sysdeps/unix/sysv/linux/aarch64/clone.S | 73 ++++++++++----
sysdeps/unix/sysv/linux/aarch64/ioctl.S | 5 +
sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h | 116 +++++++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/syscall.S | 25 +++++
4 files changed, 203 insertions(+), 16 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index ad80ac829c..4d7852304b 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -23,41 +23,82 @@
#define _ERRNO_H 1
#include <bits/errno.h>
-/* int clone(int (*fn)(void *arg), x0
- void *child_stack, x1
- int flags, x2
- void *arg, x3
- pid_t *ptid, x4
- struct user_desc *tls, x5
- pid_t *ctid); x6
+#ifdef __CHERI_PURE_CAPABILITY__
+# define arg0 c0
+# define arg1 c1
+# define arg2 c2
+# define arg3 c3
+# define arg4 c4
+# define arg5 c5
+# define arg6 c6
+# define tmp0 c10
+# define tmp1 c11
+# define tmp2 c12
+#else
+# define arg0 x0
+# define arg1 x1
+# define arg2 x2
+# define arg3 x3
+# define arg4 x4
+# define arg5 x5
+# define arg6 x6
+# define tmp0 x10
+# define tmp1 x11
+# define tmp2 x12
+#endif
+
+/* int clone(int (*fn)(void *arg), arg0
+ void *child_stack, arg1
+ int flags, arg2
+ void *arg, arg3
+ pid_t *ptid, arg4
+ struct user_desc *tls, arg5
+ pid_t *ctid); arg6
*/
.text
ENTRY(__clone)
+#ifndef __CHERI_PURE_CAPABILITY__
PTR_ARG (0)
PTR_ARG (1)
PTR_ARG (3)
PTR_ARG (4)
PTR_ARG (5)
PTR_ARG (6)
+#else
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c4, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c5, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c6, [c9,32]
+L(skip_args):
+#endif
/* Save args for the child. */
- mov x10, x0
- mov x11, x2
- mov x12, x3
+ mov tmp0, arg0
+ mov tmp1, arg2
+ mov tmp2, arg3
/* Sanity check args. */
mov x0, #-EINVAL
cbz x10, .Lsyscall_error
/* Align sp. */
+#ifndef __CHERI_PURE_CAPABILITY__
and x1, x1, -16
+#else
+ alignd c1, c1, 4
+#endif
cbz x1, .Lsyscall_error
/* Do the system call. */
/* X0:flags, x1:newsp, x2:parenttidptr, x3:newtls, x4:childtid. */
- mov x0, x2 /* flags */
+ mov arg0, arg2 /* flags */
/* New sp is already in x1. */
- mov x2, x4 /* ptid */
- mov x3, x5 /* tls */
- mov x4, x6 /* ctid */
+ mov arg2, arg4 /* ptid */
+ mov arg3, arg5 /* tls */
+ mov arg4, arg6 /* ctid */
mov x8, #SYS_ify(clone)
svc 0x0
@@ -75,8 +116,8 @@ thread_start:
mov x29, 0
/* Pick the function arg and execute. */
- mov x0, x12
- blr x10
+ mov arg0, tmp2
+ blr tmp0
/* We are done, pass the return value through x0. */
mov x8, #SYS_ify(exit)
diff --git a/sysdeps/unix/sysv/linux/aarch64/ioctl.S b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
index eb2f7211d7..88c8143452 100644
--- a/sysdeps/unix/sysv/linux/aarch64/ioctl.S
+++ b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
@@ -22,6 +22,11 @@
ENTRY(__ioctl)
mov x8, #__NR_ioctl
sxtw x0, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_arg3)
+ ldr c2, [c9]
+L(skip_arg3):
+#endif
svc #0x0
cmn x0, #4095
b.cs .Lsyscall_error
diff --git a/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
new file mode 100644
index 0000000000..5db89b096d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
@@ -0,0 +1,116 @@
+/* Copyright (C) 2022 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_AARCH64_MORELLO_SYSDEP_H
+#define _LINUX_AARCH64_MORELLO_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/aarch64/sysdep.h>
+
+#ifdef __ASSEMBLER__
+# if !IS_IN (libc)
+# undef SYSCALL_ERROR_HANDLER
+# if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w0, w0; \
+ adrp c1, :got:rtld_errno; \
+ ldr c1, [c1, :got_lo12:rtld_errno]; \
+ str w0, [c1]; \
+ mov x0, -1; \
+ RET;
+# else
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w4, w0; \
+ adrp c1, :gottprel:errno; \
+ add c1, c1, :gottprel_lo12:errno; \
+ ldp x1, x2, [c1]; \
+ mrs c3, ctpidr_el0; \
+ add c1, c3, x1, uxtx; \
+ scbnds c1, c1, x2; \
+ mov x0, -1; \
+ str w4, [c1]; \
+ RET;
+# endif
+# endif
+
+#else /* not __ASSEMBLER__ */
+
+typedef __intcap_t __sysarg_t;
+
+# undef INTERNAL_SYSCALL_RAW
+# define INTERNAL_SYSCALL_RAW(name, nr, args...) \
+ ({ __sysarg_t _sys_result; \
+ { \
+ LOAD_ARGS_##nr (args) \
+ register long _x8 asm ("x8") = (name); \
+ asm volatile ("svc 0 // syscall " # name \
+ : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \
+ _sys_result = _x0; \
+ } \
+ _sys_result; })
+
+# undef LOAD_ARGS_0
+# undef LOAD_ARGS_1
+# undef LOAD_ARGS_2
+# undef LOAD_ARGS_3
+# undef LOAD_ARGS_4
+# undef LOAD_ARGS_5
+# undef LOAD_ARGS_6
+# undef LOAD_ARGS_7
+
+# define LOAD_ARGS_0() \
+ register __sysarg_t _x0 asm ("c0");
+# define LOAD_ARGS_1(c0) \
+ __sysarg_t _x0tmp = (__sysarg_t) (c0); \
+ LOAD_ARGS_0 () \
+ _x0 = _x0tmp;
+# define LOAD_ARGS_2(c0, c1) \
+ __sysarg_t _x1tmp = (__sysarg_t) (c1); \
+ LOAD_ARGS_1 (c0) \
+ register __sysarg_t _x1 asm ("c1") = _x1tmp;
+# define LOAD_ARGS_3(c0, c1, c2) \
+ __sysarg_t _x2tmp = (__sysarg_t) (c2); \
+ LOAD_ARGS_2 (c0, c1) \
+ register __sysarg_t _x2 asm ("c2") = _x2tmp;
+# define LOAD_ARGS_4(c0, c1, c2, c3) \
+ __sysarg_t _x3tmp = (__sysarg_t) (c3); \
+ LOAD_ARGS_3 (c0, c1, c2) \
+ register __sysarg_t _x3 asm ("c3") = _x3tmp;
+# define LOAD_ARGS_5(c0, c1, c2, c3, c4) \
+ __sysarg_t _x4tmp = (__sysarg_t) (c4); \
+ LOAD_ARGS_4 (c0, c1, c2, c3) \
+ register __sysarg_t _x4 asm ("c4") = _x4tmp;
+# define LOAD_ARGS_6(c0, c1, c2, c3, c4, c5) \
+ __sysarg_t _x5tmp = (__sysarg_t) (c5); \
+ LOAD_ARGS_5 (c0, c1, c2, c3, c4) \
+ register __sysarg_t _x5 asm ("c5") = _x5tmp;
+# define LOAD_ARGS_7(c0, c1, c2, c3, c4, c5, c6)\
+ __sysarg_t _x6tmp = (__sysarg_t) (x6); \
+ LOAD_ARGS_6 (c0, c1, c2, c3, c4, c5) \
+ register __sysarg_t _x6 asm ("c6") = _x6tmp;
+
+#endif /* __ASSEMBLER__ */
+
+/* Disable pointer mangling for purecap ABI. */
+#undef PTR_MANGLE
+#undef PTR_MANGLE2
+#undef PTR_DEMANGLE
+#undef PTR_DEMANGLE2
+
+#endif /* linux/aarch64/morello/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/aarch64/syscall.S b/sysdeps/unix/sysv/linux/aarch64/syscall.S
index 9ddecb21c3..43a81fc248 100644
--- a/sysdeps/unix/sysv/linux/aarch64/syscall.S
+++ b/sysdeps/unix/sysv/linux/aarch64/syscall.S
@@ -28,6 +28,30 @@
ENTRY (syscall)
uxtw x8, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c0, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c1, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c2, [c9,32]
+ cmp x10, 48
+ bls L(skip_args)
+ ldr c3, [c9,48]
+ cmp x10, 64
+ bls L(skip_args)
+ ldr c4, [c9,64]
+ cmp x10, 80
+ bls L(skip_args)
+ ldr c5, [c9,80]
+ cmp x10, 96
+ bls L(skip_args)
+ ldr c6, [c9,96]
+L(skip_args):
+#else
mov x0, x1
mov x1, x2
mov x2, x3
@@ -35,6 +59,7 @@ ENTRY (syscall)
mov x4, x5
mov x5, x6
mov x6, x7
+#endif
svc 0x0
cmn x0, #4095
b.cs 1f
^ permalink raw reply [flat|nested] 4+ messages in thread
* [glibc/arm/morello/main] aarch64: morello: add purecap syscall support
@ 2022-10-26 15:14 Szabolcs Nagy
0 siblings, 0 replies; 4+ messages in thread
From: Szabolcs Nagy @ 2022-10-26 15:14 UTC (permalink / raw)
To: glibc-cvs
https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=3cdf8d03103035cbbf1ecf80bf843e97ba4d9a0b
commit 3cdf8d03103035cbbf1ecf80bf843e97ba4d9a0b
Author: Carlos Eduardo Seo <carlos.seo@arm.com>
Date: Thu Apr 8 12:49:27 2021 -0300
aarch64: morello: add purecap syscall support
Support the Morello Linux purecap syscall ABI. The macro definitions
are moved to a morello specific sysdep.h to avoid cluttering the
aarch64 one.
Diff:
---
sysdeps/unix/sysv/linux/aarch64/clone.S | 73 ++++++++++----
sysdeps/unix/sysv/linux/aarch64/ioctl.S | 5 +
sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h | 116 +++++++++++++++++++++++
sysdeps/unix/sysv/linux/aarch64/syscall.S | 25 +++++
4 files changed, 203 insertions(+), 16 deletions(-)
diff --git a/sysdeps/unix/sysv/linux/aarch64/clone.S b/sysdeps/unix/sysv/linux/aarch64/clone.S
index ad80ac829c..4d7852304b 100644
--- a/sysdeps/unix/sysv/linux/aarch64/clone.S
+++ b/sysdeps/unix/sysv/linux/aarch64/clone.S
@@ -23,41 +23,82 @@
#define _ERRNO_H 1
#include <bits/errno.h>
-/* int clone(int (*fn)(void *arg), x0
- void *child_stack, x1
- int flags, x2
- void *arg, x3
- pid_t *ptid, x4
- struct user_desc *tls, x5
- pid_t *ctid); x6
+#ifdef __CHERI_PURE_CAPABILITY__
+# define arg0 c0
+# define arg1 c1
+# define arg2 c2
+# define arg3 c3
+# define arg4 c4
+# define arg5 c5
+# define arg6 c6
+# define tmp0 c10
+# define tmp1 c11
+# define tmp2 c12
+#else
+# define arg0 x0
+# define arg1 x1
+# define arg2 x2
+# define arg3 x3
+# define arg4 x4
+# define arg5 x5
+# define arg6 x6
+# define tmp0 x10
+# define tmp1 x11
+# define tmp2 x12
+#endif
+
+/* int clone(int (*fn)(void *arg), arg0
+ void *child_stack, arg1
+ int flags, arg2
+ void *arg, arg3
+ pid_t *ptid, arg4
+ struct user_desc *tls, arg5
+ pid_t *ctid); arg6
*/
.text
ENTRY(__clone)
+#ifndef __CHERI_PURE_CAPABILITY__
PTR_ARG (0)
PTR_ARG (1)
PTR_ARG (3)
PTR_ARG (4)
PTR_ARG (5)
PTR_ARG (6)
+#else
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c4, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c5, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c6, [c9,32]
+L(skip_args):
+#endif
/* Save args for the child. */
- mov x10, x0
- mov x11, x2
- mov x12, x3
+ mov tmp0, arg0
+ mov tmp1, arg2
+ mov tmp2, arg3
/* Sanity check args. */
mov x0, #-EINVAL
cbz x10, .Lsyscall_error
/* Align sp. */
+#ifndef __CHERI_PURE_CAPABILITY__
and x1, x1, -16
+#else
+ alignd c1, c1, 4
+#endif
cbz x1, .Lsyscall_error
/* Do the system call. */
/* X0:flags, x1:newsp, x2:parenttidptr, x3:newtls, x4:childtid. */
- mov x0, x2 /* flags */
+ mov arg0, arg2 /* flags */
/* New sp is already in x1. */
- mov x2, x4 /* ptid */
- mov x3, x5 /* tls */
- mov x4, x6 /* ctid */
+ mov arg2, arg4 /* ptid */
+ mov arg3, arg5 /* tls */
+ mov arg4, arg6 /* ctid */
mov x8, #SYS_ify(clone)
svc 0x0
@@ -75,8 +116,8 @@ thread_start:
mov x29, 0
/* Pick the function arg and execute. */
- mov x0, x12
- blr x10
+ mov arg0, tmp2
+ blr tmp0
/* We are done, pass the return value through x0. */
mov x8, #SYS_ify(exit)
diff --git a/sysdeps/unix/sysv/linux/aarch64/ioctl.S b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
index eb2f7211d7..88c8143452 100644
--- a/sysdeps/unix/sysv/linux/aarch64/ioctl.S
+++ b/sysdeps/unix/sysv/linux/aarch64/ioctl.S
@@ -22,6 +22,11 @@
ENTRY(__ioctl)
mov x8, #__NR_ioctl
sxtw x0, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_arg3)
+ ldr c2, [c9]
+L(skip_arg3):
+#endif
svc #0x0
cmn x0, #4095
b.cs .Lsyscall_error
diff --git a/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
new file mode 100644
index 0000000000..5db89b096d
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/aarch64/morello/sysdep.h
@@ -0,0 +1,116 @@
+/* Copyright (C) 2022 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_AARCH64_MORELLO_SYSDEP_H
+#define _LINUX_AARCH64_MORELLO_SYSDEP_H 1
+
+#include <sysdeps/unix/sysv/linux/aarch64/sysdep.h>
+
+#ifdef __ASSEMBLER__
+# if !IS_IN (libc)
+# undef SYSCALL_ERROR_HANDLER
+# if RTLD_PRIVATE_ERRNO
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w0, w0; \
+ adrp c1, :got:rtld_errno; \
+ ldr c1, [c1, :got_lo12:rtld_errno]; \
+ str w0, [c1]; \
+ mov x0, -1; \
+ RET;
+# else
+# define SYSCALL_ERROR_HANDLER \
+.Lsyscall_error: \
+ neg w4, w0; \
+ adrp c1, :gottprel:errno; \
+ add c1, c1, :gottprel_lo12:errno; \
+ ldp x1, x2, [c1]; \
+ mrs c3, ctpidr_el0; \
+ add c1, c3, x1, uxtx; \
+ scbnds c1, c1, x2; \
+ mov x0, -1; \
+ str w4, [c1]; \
+ RET;
+# endif
+# endif
+
+#else /* not __ASSEMBLER__ */
+
+typedef __intcap_t __sysarg_t;
+
+# undef INTERNAL_SYSCALL_RAW
+# define INTERNAL_SYSCALL_RAW(name, nr, args...) \
+ ({ __sysarg_t _sys_result; \
+ { \
+ LOAD_ARGS_##nr (args) \
+ register long _x8 asm ("x8") = (name); \
+ asm volatile ("svc 0 // syscall " # name \
+ : "=r" (_x0) : "r"(_x8) ASM_ARGS_##nr : "memory"); \
+ _sys_result = _x0; \
+ } \
+ _sys_result; })
+
+# undef LOAD_ARGS_0
+# undef LOAD_ARGS_1
+# undef LOAD_ARGS_2
+# undef LOAD_ARGS_3
+# undef LOAD_ARGS_4
+# undef LOAD_ARGS_5
+# undef LOAD_ARGS_6
+# undef LOAD_ARGS_7
+
+# define LOAD_ARGS_0() \
+ register __sysarg_t _x0 asm ("c0");
+# define LOAD_ARGS_1(c0) \
+ __sysarg_t _x0tmp = (__sysarg_t) (c0); \
+ LOAD_ARGS_0 () \
+ _x0 = _x0tmp;
+# define LOAD_ARGS_2(c0, c1) \
+ __sysarg_t _x1tmp = (__sysarg_t) (c1); \
+ LOAD_ARGS_1 (c0) \
+ register __sysarg_t _x1 asm ("c1") = _x1tmp;
+# define LOAD_ARGS_3(c0, c1, c2) \
+ __sysarg_t _x2tmp = (__sysarg_t) (c2); \
+ LOAD_ARGS_2 (c0, c1) \
+ register __sysarg_t _x2 asm ("c2") = _x2tmp;
+# define LOAD_ARGS_4(c0, c1, c2, c3) \
+ __sysarg_t _x3tmp = (__sysarg_t) (c3); \
+ LOAD_ARGS_3 (c0, c1, c2) \
+ register __sysarg_t _x3 asm ("c3") = _x3tmp;
+# define LOAD_ARGS_5(c0, c1, c2, c3, c4) \
+ __sysarg_t _x4tmp = (__sysarg_t) (c4); \
+ LOAD_ARGS_4 (c0, c1, c2, c3) \
+ register __sysarg_t _x4 asm ("c4") = _x4tmp;
+# define LOAD_ARGS_6(c0, c1, c2, c3, c4, c5) \
+ __sysarg_t _x5tmp = (__sysarg_t) (c5); \
+ LOAD_ARGS_5 (c0, c1, c2, c3, c4) \
+ register __sysarg_t _x5 asm ("c5") = _x5tmp;
+# define LOAD_ARGS_7(c0, c1, c2, c3, c4, c5, c6)\
+ __sysarg_t _x6tmp = (__sysarg_t) (x6); \
+ LOAD_ARGS_6 (c0, c1, c2, c3, c4, c5) \
+ register __sysarg_t _x6 asm ("c6") = _x6tmp;
+
+#endif /* __ASSEMBLER__ */
+
+/* Disable pointer mangling for purecap ABI. */
+#undef PTR_MANGLE
+#undef PTR_MANGLE2
+#undef PTR_DEMANGLE
+#undef PTR_DEMANGLE2
+
+#endif /* linux/aarch64/morello/sysdep.h */
diff --git a/sysdeps/unix/sysv/linux/aarch64/syscall.S b/sysdeps/unix/sysv/linux/aarch64/syscall.S
index 9ddecb21c3..43a81fc248 100644
--- a/sysdeps/unix/sysv/linux/aarch64/syscall.S
+++ b/sysdeps/unix/sysv/linux/aarch64/syscall.S
@@ -28,6 +28,30 @@
ENTRY (syscall)
uxtw x8, w0
+#ifdef __CHERI_PURE_CAPABILITY__
+ cbz x9, L(skip_args)
+ gclen x10, c9
+ ldr c0, [c9]
+ cmp x10, 16
+ bls L(skip_args)
+ ldr c1, [c9,16]
+ cmp x10, 32
+ bls L(skip_args)
+ ldr c2, [c9,32]
+ cmp x10, 48
+ bls L(skip_args)
+ ldr c3, [c9,48]
+ cmp x10, 64
+ bls L(skip_args)
+ ldr c4, [c9,64]
+ cmp x10, 80
+ bls L(skip_args)
+ ldr c5, [c9,80]
+ cmp x10, 96
+ bls L(skip_args)
+ ldr c6, [c9,96]
+L(skip_args):
+#else
mov x0, x1
mov x1, x2
mov x2, x3
@@ -35,6 +59,7 @@ ENTRY (syscall)
mov x4, x5
mov x5, x6
mov x6, x7
+#endif
svc 0x0
cmn x0, #4095
b.cs 1f
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2022-08-05 19:32 [glibc/arm/morello/main] aarch64: morello: add purecap syscall support Szabolcs Nagy
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