From 39b491d1c8152681f64e06d72a034e725a6d0014 Mon Sep 17 00:00:00 2001
From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
Date: Wed, 27 Jun 2018 04:58:14 -0500
Subject: system/ruby: fix stack size calculation (crash on ppc64)

---
 system/ruby/APKBUILD                 |  8 +++--
 system/ruby/fix-get_main_stack.patch | 70 ++++++++++++++++++++++++++++++++++++
 2 files changed, 75 insertions(+), 3 deletions(-)
 create mode 100644 system/ruby/fix-get_main_stack.patch

diff --git a/system/ruby/APKBUILD b/system/ruby/APKBUILD
index b6547468f..3849dffb9 100644
--- a/system/ruby/APKBUILD
+++ b/system/ruby/APKBUILD
@@ -25,7 +25,7 @@
 pkgname=ruby
 pkgver=2.5.1
 _abiver="${pkgver%.*}.0"
-pkgrel=0
+pkgrel=1
 pkgdesc="An object-oriented language for quick and easy programming"
 url="http://www.ruby-lang.org/"
 arch="all"
@@ -57,7 +57,8 @@ subpackages="$pkgname-doc $pkgname-dev
 	"
 source="https://cache.ruby-lang.org/pub/ruby/${pkgver%.*}/$pkgname-$pkgver.tar.xz
 	rubygems-avoid-platform-specific-gems.patch
-	test_insns-lower-recursion-depth.patch"
+	test_insns-lower-recursion-depth.patch
+	fix-get_main_stack.patch"
 replaces="ruby-gems"
 
 _gemdir="/usr/lib/ruby/gems/$_abiver"
@@ -312,4 +313,5 @@ _mvgem() {
 
 sha512sums="31bacf58469953282cd5d8b51862dcf4b84dedb927c1871bc3fca32fc157fe49187631575a70838705fe246f4555647577a7ecc26894445a7d64de5503dc11b4  ruby-2.5.1.tar.xz
 cfdc5ea3b2e2ea69c51f38e8e2180cb1dc27008ca55cc6301f142ebafdbab31c3379b3b6bba9ff543153876dd98ed2ad194df3255b7ea77a62e931c935f80538  rubygems-avoid-platform-specific-gems.patch
-814fe6359505b70d8ff680adf22f20a74b4dbd3fecc9a63a6c2456ee9824257815929917b6df5394ed069a6869511b8c6dce5b95b4acbbb7867c1f3a975a0150  test_insns-lower-recursion-depth.patch"
+814fe6359505b70d8ff680adf22f20a74b4dbd3fecc9a63a6c2456ee9824257815929917b6df5394ed069a6869511b8c6dce5b95b4acbbb7867c1f3a975a0150  test_insns-lower-recursion-depth.patch
+8d730f02f76e53799f1c220eb23e3d2305940bb31216a7ab1e42d3256149c0721c7d173cdbfe505023b1af2f5cb3faa233dcc1b5d560fa8f980c17c2d29a9d81  fix-get_main_stack.patch"
diff --git a/system/ruby/fix-get_main_stack.patch b/system/ruby/fix-get_main_stack.patch
new file mode 100644
index 000000000..4bb9a0932
--- /dev/null
+++ b/system/ruby/fix-get_main_stack.patch
@@ -0,0 +1,70 @@
+diff --git a/thread_pthread.c b/thread_pthread.c
+index 951885ffa0..cf90321d1d 100644
+--- a/thread_pthread.c
++++ b/thread_pthread.c
+@@ -530,9 +530,6 @@ hpux_attr_getstackaddr(const pthread_attr_t *attr, void **addr)
+ #   define MAINSTACKADDR_AVAILABLE 0
+ # endif
+ #endif
+-#if MAINSTACKADDR_AVAILABLE && !defined(get_main_stack)
+-# define get_main_stack(addr, size) get_stack(addr, size)
+-#endif
+ 
+ #ifdef STACKADDR_AVAILABLE
+ /*
+@@ -614,6 +611,55 @@ get_stack(void **addr, size_t *size)
+     return 0;
+ #undef CHECK_ERR
+ }
++
++#if defined(__linux__) && !defined(__GLIBC__) && defined(HAVE_GETRLIMIT)
++
++#ifndef PAGE_SIZE
++#include <unistd.h>
++#define PAGE_SIZE sysconf(_SC_PAGE_SIZE)
++#endif
++
++static int
++get_main_stack(void **addr, size_t *size)
++{
++    size_t start, end, limit, prevend = 0;
++    struct rlimit r;
++    FILE *f;
++    char buf[PATH_MAX+80], s[8];
++    int n;
++    STACK_GROW_DIR_DETECTION;
++
++    f = fopen("/proc/self/maps", "re");
++    if (!f)
++        return -1;
++    n = 0;
++    while (fgets(buf, sizeof buf, f)) {
++        n = sscanf(buf, "%zx-%zx %*s %*s %*s %*s %7s", &start, &end, s);
++        if (n >= 2) {
++            if (n == 3 && strcmp(s, "[stack]") == 0)
++                break;
++            prevend = end;
++        }
++        n = 0;
++    }
++    fclose(f);
++    if (n == 0)
++        return -1;
++
++    limit = 100 << 20; /* 100MB stack limit */
++    if (getrlimit(RLIMIT_STACK, &r)==0 && r.rlim_cur < limit)
++        limit = r.rlim_cur & -PAGE_SIZE;
++    if (limit > end) limit = end;
++    if (prevend < end - limit) prevend = end - limit;
++    if (start > prevend) start = prevend;
++    *addr = IS_STACK_DIR_UPPER() ? (void *)start : (void *)end;
++    *size = end - start;
++    return 0;
++}
++#else
++# define get_main_stack(addr, size) get_stack(addr, size)
++#endif
++
+ #endif
+ 
+ static struct {
-- 
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