glibc: Add ARC700 support to v2.32 & v2.33

As of today ARCompact (AKA "ARCv1 ISA") processors (mostly those are ARC770)
are not officially supported by upstream glibc as it adds quite some burden
on release ans support of yet another "architecture" port.

But given on ABI and ISA front ARCompact is very close to ARCv2 we may
easily retrofit its support off-the-tree, which we do here.

Also given amount of changes we need to apply there's a hope it will be easy
and straight-forward to apply the same to later versions of glibc.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

2 files changed, 164 insertions, 0 deletions

diff --git a/packages/glibc/2.32/0002-Add-ARC700-support.patch b/packages/glibc/2.32/0002-Add-ARC700-support.patch
new file mode 100644
index 0000000..23c94a7
--- /dev/null
+++ b/packages/glibc/2.32/0002-Add-ARC700-support.patch
@@ -0,0 +1,82 @@
+From 6349ae7c3d96c8d00179e290d1ccf8a2d8438cc8 Mon Sep 17 00:00:00 2001
+From: Rosen Penev <rosenp@gmail.com>
+Date: Sat, 13 Feb 2021 17:08:21 +0300
+Subject: [PATCH] Add ARC700 support
+
+glibc does not officially support ARC700 so this adds the missing
+pieces. I looked at uClibc-ng and a patch by Synopsis for glibc.
+
+[Alexey] Taken from https://github.com/openwrt/openwrt/commit/33646a51abcf15ff5c5363848287e1ed778b7467
+
+Signed-off-by: Rosen Penev <rosenp@gmail.com>
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ sysdeps/arc/atomic-machine.h          | 4 ++++
+ sysdeps/unix/sysv/linux/arc/syscall.S | 5 +++++
+ sysdeps/unix/sysv/linux/arc/sysdep.h  | 8 ++++++++
+ 3 files changed, 17 insertions(+)
+
+diff --git a/sysdeps/arc/atomic-machine.h b/sysdeps/arc/atomic-machine.h
+index 1c8638bb44..bde66ae137 100644
+--- a/sysdeps/arc/atomic-machine.h
++++ b/sysdeps/arc/atomic-machine.h
+@@ -64,6 +64,10 @@ typedef uintmax_t uatomic_max_t;
+   __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+ 		       mem, new, old, __ATOMIC_ACQUIRE)
+ 
++#ifdef __ARC700__
++#define atomic_full_barrier()  ({ asm volatile ("sync":::"memory"); })
++#else
+ #define atomic_full_barrier()  ({ asm volatile ("dmb 3":::"memory"); })
++#endif
+ 
+ #endif /* _ARC_BITS_ATOMIC_H */
+diff --git a/sysdeps/unix/sysv/linux/arc/syscall.S b/sysdeps/unix/sysv/linux/arc/syscall.S
+index 6227dbf499..0609dbeeba 100644
+--- a/sysdeps/unix/sysv/linux/arc/syscall.S
++++ b/sysdeps/unix/sysv/linux/arc/syscall.S
+@@ -24,8 +24,13 @@ ENTRY (syscall)
+ 	mov_s	r1, r2
+ 	mov_s	r2, r3
+ 	mov_s	r3, r4
++#ifdef __ARC700__
++	mov	r4, r5
++	mov	r5, r6
++#else
+ 	mov_s	r4, r5
+ 	mov_s	r5, r6
++#endif
+ 
+ 	ARC_TRAP_INSN
+ 	brhi	r0, -4096, L (call_syscall_err)
+diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
+index 8465a2f623..3faff27b1c 100644
+--- a/sysdeps/unix/sysv/linux/arc/sysdep.h
++++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
+@@ -128,7 +128,11 @@ L (call_syscall_err):			ASM_LINE_SEP	\
+     mov    r8, __NR_##syscall_name	ASM_LINE_SEP	\
+     ARC_TRAP_INSN			ASM_LINE_SEP
+ 
++# ifdef __ARC700__
++# define ARC_TRAP_INSN	trap0
++# else
+ # define ARC_TRAP_INSN	trap_s 0
++# endif
+ 
+ #else  /* !__ASSEMBLER__ */
+ 
+@@ -139,7 +143,11 @@ extern long int __syscall_error (long int);
+ hidden_proto (__syscall_error)
+ # endif
+ 
++# ifdef __ARC700__
++# define ARC_TRAP_INSN	"trap0		\n\t"
++# else
+ # define ARC_TRAP_INSN	"trap_s 0	\n\t"
++#endif
+ 
+ # undef INTERNAL_SYSCALL_NCS
+ # define INTERNAL_SYSCALL_NCS(number, nr_args, args...)	\
+-- 
+2.16.2
+
diff --git a/packages/glibc/2.33/0002-Add-ARC700-support.patch b/packages/glibc/2.33/0002-Add-ARC700-support.patch
new file mode 100644
index 0000000..23c94a7
--- /dev/null
+++ b/packages/glibc/2.33/0002-Add-ARC700-support.patch
@@ -0,0 +1,82 @@
+From 6349ae7c3d96c8d00179e290d1ccf8a2d8438cc8 Mon Sep 17 00:00:00 2001
+From: Rosen Penev <rosenp@gmail.com>
+Date: Sat, 13 Feb 2021 17:08:21 +0300
+Subject: [PATCH] Add ARC700 support
+
+glibc does not officially support ARC700 so this adds the missing
+pieces. I looked at uClibc-ng and a patch by Synopsis for glibc.
+
+[Alexey] Taken from https://github.com/openwrt/openwrt/commit/33646a51abcf15ff5c5363848287e1ed778b7467
+
+Signed-off-by: Rosen Penev <rosenp@gmail.com>
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ sysdeps/arc/atomic-machine.h          | 4 ++++
+ sysdeps/unix/sysv/linux/arc/syscall.S | 5 +++++
+ sysdeps/unix/sysv/linux/arc/sysdep.h  | 8 ++++++++
+ 3 files changed, 17 insertions(+)
+
+diff --git a/sysdeps/arc/atomic-machine.h b/sysdeps/arc/atomic-machine.h
+index 1c8638bb44..bde66ae137 100644
+--- a/sysdeps/arc/atomic-machine.h
++++ b/sysdeps/arc/atomic-machine.h
+@@ -64,6 +64,10 @@ typedef uintmax_t uatomic_max_t;
+   __atomic_val_bysize (__arch_compare_and_exchange_val, int,		\
+ 		       mem, new, old, __ATOMIC_ACQUIRE)
+ 
++#ifdef __ARC700__
++#define atomic_full_barrier()  ({ asm volatile ("sync":::"memory"); })
++#else
+ #define atomic_full_barrier()  ({ asm volatile ("dmb 3":::"memory"); })
++#endif
+ 
+ #endif /* _ARC_BITS_ATOMIC_H */
+diff --git a/sysdeps/unix/sysv/linux/arc/syscall.S b/sysdeps/unix/sysv/linux/arc/syscall.S
+index 6227dbf499..0609dbeeba 100644
+--- a/sysdeps/unix/sysv/linux/arc/syscall.S
++++ b/sysdeps/unix/sysv/linux/arc/syscall.S
+@@ -24,8 +24,13 @@ ENTRY (syscall)
+ 	mov_s	r1, r2
+ 	mov_s	r2, r3
+ 	mov_s	r3, r4
++#ifdef __ARC700__
++	mov	r4, r5
++	mov	r5, r6
++#else
+ 	mov_s	r4, r5
+ 	mov_s	r5, r6
++#endif
+ 
+ 	ARC_TRAP_INSN
+ 	brhi	r0, -4096, L (call_syscall_err)
+diff --git a/sysdeps/unix/sysv/linux/arc/sysdep.h b/sysdeps/unix/sysv/linux/arc/sysdep.h
+index 8465a2f623..3faff27b1c 100644
+--- a/sysdeps/unix/sysv/linux/arc/sysdep.h
++++ b/sysdeps/unix/sysv/linux/arc/sysdep.h
+@@ -128,7 +128,11 @@ L (call_syscall_err):			ASM_LINE_SEP	\
+     mov    r8, __NR_##syscall_name	ASM_LINE_SEP	\
+     ARC_TRAP_INSN			ASM_LINE_SEP
+ 
++# ifdef __ARC700__
++# define ARC_TRAP_INSN	trap0
++# else
+ # define ARC_TRAP_INSN	trap_s 0
++# endif
+ 
+ #else  /* !__ASSEMBLER__ */
+ 
+@@ -139,7 +143,11 @@ extern long int __syscall_error (long int);
+ hidden_proto (__syscall_error)
+ # endif
+ 
++# ifdef __ARC700__
++# define ARC_TRAP_INSN	"trap0		\n\t"
++# else
+ # define ARC_TRAP_INSN	"trap_s 0	\n\t"
++#endif
+ 
+ # undef INTERNAL_SYSCALL_NCS
+ # define INTERNAL_SYSCALL_NCS(number, nr_args, args...)	\
+-- 
+2.16.2
+