package/libffi: fix build on ARC

This commit brings two patches that have been submitted to upstream
libffi by Synopsys people, to fix libffi build issues on ARC.

This build issue was introduced by upstream commit
c4df19c99f8d8841942e3edaadbf331d30e298c8, which landed in libffi
3.4.5, so the issue exists in Buildroot since we bumped from libffi
3.4.4 to 3.4.6 in commit f382de2b0f8a528a09bb975cc088a4342b663134,
which landed in Buildroot 2024.05. This issue therefore doesn't exist
in the 2024.02.x LTS branch.

Fixes:

  http://autobuild.buildroot.net/results/3accebc6775b9a479876a5898d55bde005d4b12b/

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/libffi/0002-arc-Fix-warnings.patch

@@ -0,0 +1,56 @@
+From 4f25e5be1a8a429b6925527c1cb94b6acd05642b Mon Sep 17 00:00:00 2001
+From: Yuriy Kolerov <ykolerov@synopsys.com>
+Date: Wed, 17 Jul 2024 18:56:52 +0300
+Subject: [PATCH] arc: Fix warnings
+
+These warnings are fixed:
+
+1. A series of "unused variables".
+2. Implicit conversion from a pointer to uint32_t.
+
+Signed-off-by: Yuriy Kolerov <ykolerov@synopsys.com>
+Upstream: https://github.com/libffi/libffi/pull/844
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ src/arc/ffi.c | 8 ++++++--
+ 1 file changed, 6 insertions(+), 2 deletions(-)
+
+diff --git a/src/arc/ffi.c b/src/arc/ffi.c
+index d729274..0632319 100644
+--- a/src/arc/ffi.c
++++ b/src/arc/ffi.c
+@@ -192,9 +192,10 @@ static void unmarshal_atom(call_builder *cb, int type, void *data) {
+ /* for arguments passed by reference returns the pointer, otherwise the arg is copied (up to MAXCOPYARG bytes) */
+ static void *unmarshal(call_builder *cb, ffi_type *type, int var, void *data) {
+   size_t realign[2];
+-  void *pointer;
+ 
+ #if defined(__ARC64_ARCH64__)
++  void *pointer;
++
+   if (type->size > 2 * __SIZEOF_POINTER__) {
+         /* pass by reference */
+         unmarshal_atom(cb, FFI_TYPE_POINTER, (char*)&pointer);
+@@ -348,7 +349,10 @@ ffi_prep_closure_loc (ffi_closure * closure, ffi_cif * cif,
+ 		      void *user_data, void *codeloc)
+ {
+   uint32_t *tramp = (uint32_t *) & (closure->tramp[0]);
++
++#if defined(__ARC64_ARCH64__)
+   size_t address_ffi_closure = (size_t) ffi_closure_asm;
++#endif
+ 
+   switch (cif->abi)
+     {
+@@ -367,7 +371,7 @@ ffi_prep_closure_loc (ffi_closure * closure, ffi_cif * cif,
+       FFI_ASSERT (tramp == codeloc);
+       tramp[0] = CODE_ENDIAN (0x200a1fc0);	/* mov r8, pcl  */
+       tramp[1] = CODE_ENDIAN (0x20200f80);	/* j [long imm] */
+-      tramp[2] = CODE_ENDIAN (ffi_closure_asm);
++      tramp[2] = CODE_ENDIAN ((uint32_t) ffi_closure_asm);
+       break;
+ #endif
+ 
+-- 
+2.46.0
+

package/libffi/0003-arc-Do-not-use-mov_s-and-movl_s-instructions.patch

@@ -0,0 +1,45 @@
+From 97c273519e41a7ef2841cb7531c6eda01fc69dc2 Mon Sep 17 00:00:00 2001
+From: Yuriy Kolerov <ykolerov@synopsys.com>
+Date: Wed, 17 Jul 2024 19:19:30 +0300
+Subject: [PATCH] arc: Do not use mov_s and movl_s instructions
+
+mov_s and movl_s instructions use a restricted set of registers.
+However, a list of available registers for such instructions for
+one ARC target may not match a list for another ARC targets. For
+example, it is applicable to ARC700 and ARC HS3x/4x - build
+fails because mov_s formats may be incompatible in some cases.
+
+The easiest and the most straightforward way to fix this issue
+is to use mov and movl instead of mov_s and movl_s.
+
+Signed-off-by: Yuriy Kolerov <ykolerov@synopsys.com>
+Upstream: https://github.com/libffi/libffi/pull/844
+Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
+---
+ src/arc/arcompact.S | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/arc/arcompact.S b/src/arc/arcompact.S
+index 1d7f1a1..e749341 100644
+--- a/src/arc/arcompact.S
++++ b/src/arc/arcompact.S
+@@ -39,14 +39,14 @@
+ #define LARG ldl
+ #define SARG stl
+ #define ADDPTR addl
+-#define MOVPTR movl_s
++#define MOVPTR movl
+ #else
+ #define PTRS 4
+ #define FLTS 4
+ #define LARG ld
+ #define SARG st
+ #define ADDPTR add
+-#define MOVPTR mov_s
++#define MOVPTR mov
+ #endif
+ 
+ #define FRAME_LEN (8 * PTRS + 16)
+-- 
+2.46.0
+