FreeBSD AArch64 libunwind build (backtrace.c:71:7: error: no member named 'regs' in 'struct __mcontext')

From 90023f56fa4d4093ec5839e0ce3aba4444fbcf58 Mon Sep 17 00:00:00 2001
From: Mikael Urankar <[email protected]>
Date: Wed, 16 Mar 2022 09:38:46 +0100
Subject: [PATCH] devel/libunwind: Fix build on aarch64

---
 .../files/patch-include_libunwind-aarch64.h   | 28 +++++++++++++++++++
 .../libunwind/files/patch-src_aarch64_Ginit.c | 20 +++++++++++++
 .../files/patch-src_aarch64_unwind__i.h       | 13 +++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 devel/libunwind/files/patch-include_libunwind-aarch64.h
 create mode 100644 devel/libunwind/files/patch-src_aarch64_Ginit.c
 create mode 100644 devel/libunwind/files/patch-src_aarch64_unwind__i.h

diff --git a/devel/libunwind/files/patch-include_libunwind-aarch64.h b/devel/libunwind/files/patch-include_libunwind-aarch64.h
new file mode 100644
index 000000000000..b15e9f14f249
--- /dev/null
+++ b/devel/libunwind/files/patch-include_libunwind-aarch64.h
@@ -0,0 +1,28 @@
+--- include/libunwind-aarch64.h.orig    2021-12-01 00:46:39 UTC
++++ include/libunwind-aarch64.h
+@@ -226,15 +226,24 @@ typedef struct
+ #else
+ /* On AArch64, we can directly use ucontext_t as the unwind context.  */
+ typedef ucontext_t unw_tdep_context_t;
++#if defined(__FreeBSD__)
++typedef ucontext_t unw_fpsimd_context_t;
+ #endif
++#endif
+
+
+ #include "libunwind-common.h"
+ #include "libunwind-dynamic.h"
+
++#if defined(__FreeBSD__)
++#define UNW_BASE register uint64_t unw_base __asm__ ("x0") = (uint64_t) unw_ctx->uc_mcontext.mc_gpregs.gp_x[0];
++#else
++#define UNW_BASE register uint64_t unw_base __asm__ ("x0") = (uint64_t) unw_ctx->uc_mcontext.regs;
++#endif
++
+ #define unw_tdep_getcontext(uc) ({                    \
+   unw_tdep_context_t *unw_ctx = (uc);                    \
+-  register uint64_t unw_base __asm__ ("x0") = (uint64_t) unw_ctx->uc_mcontext.regs; \
++  UNW_BASE \
+   __asm__ __volatile__ (                            \
+      "stp x0, x1, [%[base], #0]\n" \
+      "stp x2, x3, [%[base], #16]\n" \
diff --git a/devel/libunwind/files/patch-src_aarch64_Ginit.c b/devel/libunwind/files/patch-src_aarch64_Ginit.c
new file mode 100644
index 000000000000..d4687b361b27
--- /dev/null
+++ b/devel/libunwind/files/patch-src_aarch64_Ginit.c
@@ -0,0 +1,20 @@
+--- src/aarch64/Ginit.c.orig    2021-11-30 17:12:31 UTC
++++ src/aarch64/Ginit.c
+@@ -47,9 +47,17 @@ static inline void *
+ uc_addr (unw_tdep_context_t *uc, int reg)
+ {
+   if (reg >= UNW_AARCH64_X0 && reg < UNW_AARCH64_V0)
++#if defined(__FreeBSD__)
++    return &uc->uc_mcontext.mc_gpregs.gp_x[reg];
++#else
+     return &uc->uc_mcontext.regs[reg];
++#endif
+   else if (reg >= UNW_AARCH64_V0 && reg <= UNW_AARCH64_V31)
++#if defined(__FreeBSD__)
++    return &GET_FPCTX(uc)->uc_mcontext.mc_fpregs.fp_q[reg - UNW_AARCH64_V0];
++#else
+     return &GET_FPCTX(uc)->vregs[reg - UNW_AARCH64_V0];
++#endif
+   else
+     return NULL;
+ }
diff --git a/devel/libunwind/files/patch-src_aarch64_unwind__i.h b/devel/libunwind/files/patch-src_aarch64_unwind__i.h
new file mode 100644
index 000000000000..aa1e8ccbc838
--- /dev/null
+++ b/devel/libunwind/files/patch-src_aarch64_unwind__i.h
@@ -0,0 +1,13 @@
+--- src/aarch64/unwind_i.h.orig    2020-04-28 15:49:14 UTC
++++ src/aarch64/unwind_i.h
+@@ -59,6 +59,10 @@ extern int aarch64_local_resume (unw_addr_space_t as,
+   } while (0)
+ #endif
+
++#if defined(__FreeBSD__)
++#define GET_FPCTX(uc) ((unw_tdep_context_t *)(&uc->uc_mcontext.mc_spare))
++#else
+ #define GET_FPCTX(uc) ((unw_fpsimd_context_t *)(&uc->uc_mcontext.__reserved))
++#endif
+
+ #endif /* unwind_i_h */
--
2.34.1