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authorA. Wilcox <AWilcox@Wilcox-Tech.com>2022-04-25 23:35:51 -0500
committerA. Wilcox <AWilcox@Wilcox-Tech.com>2022-05-01 17:06:41 -0500
commit9233ddc40adf40a8907b6237c665fc34090f122c (patch)
tree1b0113d0e22c0fc0ccfbb37fb0db070708ba47e1 /system/libucontext
parentb897a318a81a67581c4290bad3d5258005e5f781 (diff)
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system/libucontext: Fix segfault on pmmx
Revert a commit that uses the common trampoline. TODO: report upstream.
Diffstat (limited to 'system/libucontext')
-rw-r--r--system/libucontext/APKBUILD7
-rw-r--r--system/libucontext/pmmx.patch87
2 files changed, 92 insertions, 2 deletions
diff --git a/system/libucontext/APKBUILD b/system/libucontext/APKBUILD
index c7e2132fc..ae05f76ff 100644
--- a/system/libucontext/APKBUILD
+++ b/system/libucontext/APKBUILD
@@ -9,7 +9,9 @@ license="ISC"
depends=""
makedepends=""
subpackages="$pkgname-dev"
-source="https://distfiles.dereferenced.org/libucontext/libucontext-$pkgver.tar.xz"
+source="https://distfiles.dereferenced.org/libucontext/libucontext-$pkgver.tar.xz
+ pmmx.patch
+ "
case "$CTARGET_ARCH" in
aarch64_be) LIBUCONTEXT_ARCH="aarch64" ;;
@@ -31,4 +33,5 @@ package() {
make ARCH="$LIBUCONTEXT_ARCH" DESTDIR="$pkgdir" install
}
-sha512sums="6603f2dcd87c4d9919c1726f2964632483e1a647733ff543d5935e3e2dac548adf320f1f9fb4c494691fe99fb393d64b15369f04d3783b2ca4c40b68c3d87865 libucontext-1.2.tar.xz"
+sha512sums="6603f2dcd87c4d9919c1726f2964632483e1a647733ff543d5935e3e2dac548adf320f1f9fb4c494691fe99fb393d64b15369f04d3783b2ca4c40b68c3d87865 libucontext-1.2.tar.xz
+e5855aaf5042856e019dcd8bbf85c1319c4ed3ea836fd64617595b1fcacc14a101f7631e9d07a8af7f624a82c59a5bc6d2c1011b961ba4fede37725b6f5e9c37 pmmx.patch"
diff --git a/system/libucontext/pmmx.patch b/system/libucontext/pmmx.patch
new file mode 100644
index 000000000..3f6019ab8
--- /dev/null
+++ b/system/libucontext/pmmx.patch
@@ -0,0 +1,87 @@
+From 196db62779287efb098943c2d4f2433e4b8ea592 Mon Sep 17 00:00:00 2001
+From: "A. Wilcox" <AWilcox@Wilcox-Tech.com>
+Date: Mon, 25 Apr 2022 23:34:32 -0500
+Subject: [PATCH] Revert "x86: port to use common trampoline"
+
+This reverts commit 388edbe12138e8300e230e2bc9c08a8f273e98d9.
+---
+ arch/x86/defs.h | 3 ---
+ arch/x86/startcontext.S | 41 +++++++++++++++++++++++++++++++++++++++++
+ arch/x86/trampoline.c | 3 ---
+ 3 files changed, 41 insertions(+), 6 deletions(-)
+ create mode 100644 arch/x86/startcontext.S
+ delete mode 100644 arch/x86/trampoline.c
+
+diff --git a/arch/x86/defs.h b/arch/x86/defs.h
+index 9370869..e0166e5 100644
+--- a/arch/x86/defs.h
++++ b/arch/x86/defs.h
+@@ -57,9 +57,6 @@
+
+ #define MCONTEXT_GREGS (20)
+
+-#define FETCH_LINKPTR(dest) \
+- asm("movl (%%esp, %%ebx, 4), %0" : "=r" ((dest)));
+-
+ #include "common-defs.h"
+
+ #endif
+diff --git a/arch/x86/startcontext.S b/arch/x86/startcontext.S
+new file mode 100644
+index 0000000..1cbc68c
+--- /dev/null
++++ b/arch/x86/startcontext.S
+@@ -0,0 +1,41 @@
++/*
++ * Copyright (c) 2018, 2020 Ariadne Conill <ariadne@dereferenced.org>
++ *
++ * Permission to use, copy, modify, and/or distribute this software for any
++ * purpose with or without fee is hereby granted, provided that the above
++ * copyright notice and this permission notice appear in all copies.
++ *
++ * This software is provided 'as is' and without any warranty, express or
++ * implied. In no event shall the authors be liable for any damages arising
++ * from the use of this software.
++ */
++
++#include "defs.h"
++
++FUNC(libucontext_trampoline)
++ /* get the proper context into position and test for NULL */
++ leal (%esp,%ebx,4), %esp
++ cmpl $0, (%esp)
++
++ /* restore global offset table, exit@plt and libucontext_setcontext@plt need this */
++ call __i686.get_pc_thunk.bx
++ addl $_GLOBAL_OFFSET_TABLE_, %ebx
++
++ /* if we have no linked context, lets get out of here */
++ je no_linked_context
++
++ /* call setcontext to switch to the linked context */
++ call libucontext_setcontext@plt
++ movl %eax, (%esp)
++
++no_linked_context:
++ /* we are returning into a null context, it seems, so maybe we should exit */
++ call exit@plt
++
++ /* something is really hosed, call hlt to force termination */
++ hlt
++
++__i686.get_pc_thunk.bx:
++ mov (%esp), %ebx
++ ret
++END(libucontext_trampoline)
+diff --git a/arch/x86/trampoline.c b/arch/x86/trampoline.c
+deleted file mode 100644
+index 699a050..0000000
+--- a/arch/x86/trampoline.c
++++ /dev/null
+@@ -1,3 +0,0 @@
+-#include "defs.h"
+-#include <libucontext/libucontext.h>
+-#include "common-trampoline.c"
+--
+2.32.0 (Apple Git-132)
+