gcc: delete duplicate patch

toolchain/gcc/patches/16.2.0/0001-microblaze-add-Linux-signal-frame-unwinding-support.patch

@@ -1,197 +0,0 @@
-From 4ef64ad1aa9bbbe9471610e2de6ef0c8afed8b1f Mon Sep 17 00:00:00 2001
-From: Ramin Moussavi <lordrasmus@gmail.com>
-Date: Wed, 3 Jun 2026 00:00:00 +0200
-Subject: [PATCH] microblaze: add Linux signal frame unwinding support
-
-libgcc has no MD_FALLBACK_FRAME_STATE_FOR for microblaze*-linux*, so the
-DWARF unwinder cannot step through signal frames at all.  Anything that
-unwinds out of a signal handler -- most prominently NPTL asynchronous
-pthread cancellation (SIGCANCEL) -- either stops early with
-_URC_END_OF_STACK (cleanup handlers below the signal frame never run) or
-misinterprets the on-stack signal trampoline and crashes with SIGSEGV.
-
-Add the standard fallback: recognize the two-instruction trampoline the
-kernel writes into struct rt_sigframe on the stack
-
-	addik r12, r0, __NR_rt_sigreturn
-	brki  r14, 0x8
-
-and rebuild the frame state from the sigcontext's pt_regs.  The ucontext
-is anchored relative to the trampoline (its last member) rather than to
-the CFA, so the layout of the frame head does not matter.
-
-The interrupted PC is recorded in DWARF column 36, one past the hard
-registers, because column 15 must keep the interrupted r15 (unrelated to
-the resume address of a signal frame).  Declaring it as
-DWARF_ALT_FRAME_RETURN_COLUMN makes init_dwarf_reg_size_table size the
-column; without that _Unwind_GetGR reads a zero size and aborts.
-
-Tested with a microblazeel-linux-uclibc cross compiler against uClibc-ng
-git, running its NPTL test suite under qemu-system-microblazeel -M
-petalogix-s3adsp1800.  Without the fix 17 tests fail (tst-cancel{1..5,7,
-9,16,20,x4,x7}, tst-cleanup{1..3}, tst-cond{16,17}) by SIGSEGV or by
-hanging in the unwinder; with it all 17 pass and the rest of the suite
-is unchanged.  The implementation follows the mips/aarch64
-linux-unwind.h pattern.
-
-gcc/ChangeLog:
-
-	* config/microblaze/microblaze.h (DWARF_ALT_FRAME_RETURN_COLUMN):
-	Define.
-
-libgcc/ChangeLog:
-
-	* config.host (microblaze*-linux*): Set md_unwind_header.
-	* config/microblaze/linux-unwind.h: New file.
-
-Signed-off-by: Ramin Moussavi <ramin.moussavi@yacoub.de>
-Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
----
- gcc/config/microblaze/microblaze.h      |   8 ++
- libgcc/config.host                      |   1 +
- libgcc/config/microblaze/linux-unwind.h | 102 ++++++++++++++++++++++++
- 3 files changed, 111 insertions(+)
- create mode 100644 libgcc/config/microblaze/linux-unwind.h
-
-diff --git a/gcc/config/microblaze/microblaze.h b/gcc/config/microblaze/microblaze.h
-index 2b5bd52040f..fc8c4b87175 100644
---- a/gcc/config/microblaze/microblaze.h
-+++ b/gcc/config/microblaze/microblaze.h
-@@ -176,6 +176,14 @@ extern enum pipeline_type microblaze_pipe;
- #define DWARF_FRAME_RETURN_COLUMN \
- 	(GP_REG_FIRST + MB_ABI_SUB_RETURN_ADDR_REGNUM)
- 
-+/* Signal frames (config/microblaze/linux-unwind.h) record the
-+   interrupted PC in DWARF column 36, one past the hard registers,
-+   because column 15 must keep the interrupted r15.  Declaring it as
-+   the alternate return column makes init_dwarf_reg_size_table size
-+   it; otherwise _Unwind_GetGR aborts when unwinding through a signal
-+   frame, such as during pthread cancellation.  */
-+#define DWARF_ALT_FRAME_RETURN_COLUMN 36
-+
- /* Initial state of return address on entry to func = R15.
-    Actually, the RA is at R15+8, but gcc doesn't know how
-    to generate this.
-diff --git a/libgcc/config.host b/libgcc/config.host
-index 046156fa5e7..a685d5da7a1 100644
---- a/libgcc/config.host
-+++ b/libgcc/config.host
-@@ -1050,6 +1050,7 @@ mcore-*-elf)
- 	;;
- microblaze*-linux*)
- 	tmake_file="${tmake_file} microblaze/t-microblaze t-fdpbit t-slibgcc-libgcc"
-+	md_unwind_header=microblaze/linux-unwind.h
- 	;;
- microblaze*-*-elf)
- 	tmake_file="${tmake_file} microblaze/t-microblaze t-fdpbit"
-diff --git a/libgcc/config/microblaze/linux-unwind.h b/libgcc/config/microblaze/linux-unwind.h
-new file mode 100644
-index 00000000000..b54704a0651
---- /dev/null
-+++ b/libgcc/config/microblaze/linux-unwind.h
-@@ -0,0 +1,102 @@
-+/* DWARF2 EH unwinding support for MicroBlaze Linux.
-+   Copyright (C) 2026 Free Software Foundation, Inc.
-+
-+   This file is part of GCC.
-+
-+   GCC is free software; you can redistribute it and/or modify
-+   it under the terms of the GNU General Public License as published by
-+   the Free Software Foundation; either version 3, or (at your option)
-+   any later version.
-+
-+   GCC 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 General Public License for more details.
-+
-+   Under Section 7 of GPL version 3, you are granted additional
-+   permissions described in the GCC Runtime Library Exception, version
-+   3.1, as published by the Free Software Foundation.
-+
-+   You should have received a copy of the GNU General Public License and
-+   a copy of the GCC Runtime Library Exception along with this program;
-+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
-+   <http://www.gnu.org/licenses/>.  */
-+
-+#ifndef inhibit_libc
-+
-+/* Do code reading to identify a signal frame, and set the frame state
-+   data appropriately.  See unwind-dw2.c for the structs.  */
-+
-+#include <signal.h>
-+#include <sys/ucontext.h>
-+#include <asm/unistd.h>
-+
-+#define MD_FALLBACK_FRAME_STATE_FOR microblaze_fallback_frame_state
-+
-+static _Unwind_Reason_Code
-+microblaze_fallback_frame_state (struct _Unwind_Context *context,
-+				 _Unwind_FrameState *fs)
-+{
-+  const unsigned int *pc = (const unsigned int *) context->ra;
-+  struct sigcontext *sc;
-+  _Unwind_Ptr new_cfa;
-+  int i;
-+
-+  /* The outermost frame of a thread may leave a null or near-null
-+     return address; do not dereference it looking for the
-+     trampoline.  */
-+  if ((unsigned long) pc < 4096)
-+    return _URC_END_OF_STACK;
-+
-+  /* The kernel writes the signal trampoline onto the stack
-+     (struct rt_sigframe.tramp):
-+
-+	addik r12, r0, __NR_rt_sigreturn
-+	brki  r14, 0x8
-+
-+     and sets the saved r15 to the trampoline address minus 8 (the
-+     handler returns with "rtsd r15, 8"), so the unwound return
-+     address points 8 bytes before the trampoline.  */
-+  if (pc[0] == (0x31800000 | __NR_rt_sigreturn) && pc[1] == 0xb9cc0008)
-+    ;
-+  else if (pc[2] == (0x31800000 | __NR_rt_sigreturn) && pc[3] == 0xb9cc0008)
-+    pc += 2;
-+  else
-+    return _URC_END_OF_STACK;
-+
-+  /* The trampoline is the last member of the kernel's rt_sigframe and
-+     the ucontext sits directly in front of it.  Anchor there rather
-+     than at the CFA so the layout of the frame head does not matter
-+     (the kernel may insert an ABI argument-home gap at the front).
-+     uClibc's ucontext_t matches the kernel's struct ucontext.  */
-+  ucontext_t *uc = (ucontext_t *) ((_Unwind_Ptr) pc - sizeof (ucontext_t));
-+
-+  sc = (struct sigcontext *) &uc->uc_mcontext;
-+
-+  new_cfa = sc->regs.r1;
-+  fs->regs.cfa_how = CFA_REG_OFFSET;
-+  fs->regs.cfa_reg = 1;		/* r1, the stack pointer.  */
-+  fs->regs.cfa_offset = new_cfa - (_Unwind_Ptr) context->cfa;
-+
-+  /* pt_regs holds r0..r31 consecutively.  */
-+  for (i = 0; i < 32; i++)
-+    {
-+      fs->regs.how[i] = REG_SAVED_OFFSET;
-+      fs->regs.reg[i].loc.offset
-+	= (_Unwind_Ptr) &sc->regs.r0 + i * sizeof (unsigned long) - new_cfa;
-+    }
-+
-+  /* The interrupted PC goes into the alternate return column
-+     (DWARF_ALT_FRAME_RETURN_COLUMN, defined as 36 in
-+     gcc/config/microblaze/microblaze.h), one past the hard registers;
-+     column 15 above keeps the interrupted r15.  */
-+  fs->regs.how[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__] = REG_SAVED_OFFSET;
-+  fs->regs.reg[__LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__].loc.offset
-+    = (_Unwind_Ptr) &sc->regs.pc - new_cfa;
-+  fs->retaddr_column = __LIBGCC_DWARF_ALT_FRAME_RETURN_COLUMN__;
-+  fs->signal_frame = 1;
-+
-+  return _URC_NO_REASON;
-+}
-+
-+#endif
--- 
-2.47.3
-