diff options
Diffstat (limited to 'system/libucontext/ppc64-assembly.patch')
| -rw-r--r-- | system/libucontext/ppc64-assembly.patch | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/system/libucontext/ppc64-assembly.patch b/system/libucontext/ppc64-assembly.patch new file mode 100644 index 000000000..66fb3104d --- /dev/null +++ b/system/libucontext/ppc64-assembly.patch @@ -0,0 +1,331 @@ +From 7b864e86e3e8e64fe69363137384ee9b858fe78d Mon Sep 17 00:00:00 2001 +From: Bobby Bingham <koorogi@koorogi.info> +Date: Sat, 23 Feb 2019 17:12:37 -0600 +Subject: [PATCH 2/3] ppc64: rewrite get/set/swapcontext in assembly + +If getcontext makes any function call, which it does to call syscall, then +it must spill its return address to the stack. After it returns to its +caller, that return address can be clobbered. When setcontext is called +to resume this saved context, the correct return address is not available. +--- + Makefile | 10 ++------- + arch/ppc64/getcontext.S | 25 +++++++++++++++++++++ + arch/ppc64/getcontext.c | 45 ------------------------------------- + arch/ppc64/retfromsyscall.c | 24 ++++++++++++++++++++ + arch/ppc64/setcontext.S | 26 +++++++++++++++++++++ + arch/ppc64/setcontext.c | 45 ------------------------------------- + arch/ppc64/swapcontext.S | 28 +++++++++++++++++++++++ + arch/ppc64/swapcontext.c | 45 ------------------------------------- + 8 files changed, 105 insertions(+), 143 deletions(-) + create mode 100644 arch/ppc64/getcontext.S + delete mode 100644 arch/ppc64/getcontext.c + create mode 100644 arch/ppc64/retfromsyscall.c + create mode 100644 arch/ppc64/setcontext.S + delete mode 100644 arch/ppc64/setcontext.c + create mode 100644 arch/ppc64/swapcontext.S + delete mode 100644 arch/ppc64/swapcontext.c + +diff --git a/Makefile b/Makefile +index 51365a3..d6ff1b0 100644 +--- a/Makefile ++++ b/Makefile +@@ -2,14 +2,8 @@ ARCH := $(shell uname -m) + + CFLAGS = -ggdb3 -O2 -Wall -Iarch/${ARCH} + +-LIBUCONTEXT_C_SRC = \ +- arch/${ARCH}/makecontext.c +- +-LIBUCONTEXT_S_SRC = \ +- arch/${ARCH}/getcontext.S \ +- arch/${ARCH}/setcontext.S \ +- arch/${ARCH}/swapcontext.S \ +- arch/${ARCH}/startcontext.S ++LIBUCONTEXT_C_SRC = $(wildcard arch/${ARCH}/*.c) ++LIBUCONTEXT_S_SRC = $(wildcard arch/${ARCH}/*.S) + + LIBUCONTEXT_OBJ = ${LIBUCONTEXT_C_SRC:.c=.o} ${LIBUCONTEXT_S_SRC:.S=.o} + LIBUCONTEXT_SOVERSION = 0 +diff --git a/arch/ppc64/getcontext.S b/arch/ppc64/getcontext.S +new file mode 100644 +index 0000000..935edd2 +--- /dev/null ++++ b/arch/ppc64/getcontext.S +@@ -0,0 +1,25 @@ ++/* ++ * Copyright (c) 2019 Bobby Bingham <koorogi@koorogi.info> ++ * ++ * 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. ++ */ ++ ++.global __getcontext ++.hidden __swapcontext ++__getcontext: ++ addis 2, 12, .TOC.-__getcontext@ha ++ addi 2, 12, .TOC.-__getcontext@l ++ ++ .localentry __getcontext,.-__getcontext ++ ++ li 4, 0 ++ b __swapcontext ++ ++.weak getcontext ++getcontext = __getcontext +diff --git a/arch/ppc64/getcontext.c b/arch/ppc64/getcontext.c +deleted file mode 100644 +index 5da9dfb..0000000 +--- a/arch/ppc64/getcontext.c ++++ /dev/null +@@ -1,45 +0,0 @@ +-/* +- * Copyright (c) 2018 William Pitcock <nenolod@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. +- */ +- +-#define _GNU_SOURCE +-#include <stddef.h> +-#include <stdarg.h> +-#include <signal.h> +-#include <string.h> +-#include <stdint.h> +-#include <errno.h> +-#include <unistd.h> +-#include <sys/syscall.h> +- +- +-int +-__getcontext(ucontext_t *ucp) +-{ +-#ifdef SYS_swapcontext +- int r; +- +- r = syscall(SYS_swapcontext, ucp, NULL, sizeof(ucontext_t)); +- if (r < 0) +- { +- errno = -r; +- return -1; +- } +- +- return 0; +-#else +- errno = ENOSYS; +- return -1; +-#endif +-} +- +- +-extern __typeof(__getcontext) getcontext __attribute__((weak, __alias__("__getcontext"))); +diff --git a/arch/ppc64/retfromsyscall.c b/arch/ppc64/retfromsyscall.c +new file mode 100644 +index 0000000..22c5134 +--- /dev/null ++++ b/arch/ppc64/retfromsyscall.c +@@ -0,0 +1,24 @@ ++/* ++ * Copyright (c) 2019 Bobby Bingham <koorogi@koorogi.info> ++ * ++ * 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 <errno.h> ++ ++__attribute__ ((visibility ("hidden"))) ++int __retfromsyscall(long retval) ++{ ++ if (retval < 0) { ++ errno = -retval; ++ return -1; ++ } ++ return 0; ++} ++ +diff --git a/arch/ppc64/setcontext.S b/arch/ppc64/setcontext.S +new file mode 100644 +index 0000000..5a0cde3 +--- /dev/null ++++ b/arch/ppc64/setcontext.S +@@ -0,0 +1,26 @@ ++/* ++ * Copyright (c) 2019 Bobby Bingham <koorogi@koorogi.info> ++ * ++ * 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. ++ */ ++ ++.global __setcontext ++.hidden __swapcontext ++__setcontext: ++ addis 2, 12, .TOC.-__setcontext@ha ++ addi 2, 12, .TOC.-__setcontext@l ++ ++ .localentry __setcontext,.-__setcontext ++ ++ mr 4, 3 ++ li 3, 0 ++ b __swapcontext ++ ++.weak setcontext ++setcontext = __setcontext +diff --git a/arch/ppc64/setcontext.c b/arch/ppc64/setcontext.c +deleted file mode 100644 +index 59c65b4..0000000 +--- a/arch/ppc64/setcontext.c ++++ /dev/null +@@ -1,45 +0,0 @@ +-/* +- * Copyright (c) 2018 William Pitcock <nenolod@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. +- */ +- +-#define _GNU_SOURCE +-#include <stddef.h> +-#include <stdarg.h> +-#include <signal.h> +-#include <string.h> +-#include <stdint.h> +-#include <errno.h> +-#include <unistd.h> +-#include <sys/syscall.h> +- +- +-int +-__setcontext(const ucontext_t *ucp) +-{ +-#ifdef SYS_swapcontext +- int r; +- +- r = syscall(SYS_swapcontext, NULL, (void *) ucp, sizeof(ucontext_t)); +- if (r < 0) +- { +- errno = -r; +- return -1; +- } +- +- return r; +-#else +- errno = ENOSYS; +- return -1; +-#endif +-} +- +- +-extern __typeof(__setcontext) setcontext __attribute__((weak, __alias__("__setcontext"))); +diff --git a/arch/ppc64/swapcontext.S b/arch/ppc64/swapcontext.S +new file mode 100644 +index 0000000..982537a +--- /dev/null ++++ b/arch/ppc64/swapcontext.S +@@ -0,0 +1,28 @@ ++/* ++ * Copyright (c) 2019 Bobby Bingham <koorogi@koorogi.info> ++ * ++ * 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. ++ */ ++ ++.global __swapcontext ++__swapcontext: ++ addis 2, 12, .TOC.-__swapcontext@ha ++ addi 2, 12, .TOC.-__swapcontext@l ++ ++ .localentry __swapcontext,.-__swapcontext ++ ++ li 0, 249 # SYS_swapcontext ++ li 5, 1696 # sizeof(ucontext_t) ++ sc ++ ++.hidden __retfromsyscall ++ b __retfromsyscall ++ ++.weak swapcontext ++swapcontext = __swapcontext +diff --git a/arch/ppc64/swapcontext.c b/arch/ppc64/swapcontext.c +deleted file mode 100644 +index af14bc2..0000000 +--- a/arch/ppc64/swapcontext.c ++++ /dev/null +@@ -1,45 +0,0 @@ +-/* +- * Copyright (c) 2018 William Pitcock <nenolod@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. +- */ +- +-#define _GNU_SOURCE +-#include <stddef.h> +-#include <stdarg.h> +-#include <signal.h> +-#include <string.h> +-#include <stdint.h> +-#include <errno.h> +-#include <unistd.h> +-#include <sys/syscall.h> +- +- +-int +-__swapcontext(ucontext_t *oucp, const ucontext_t *ucp) +-{ +-#ifdef SYS_swapcontext +- int r; +- +- r = syscall(SYS_swapcontext, oucp, ucp, sizeof(ucontext_t)); +- if (r < 0) +- { +- errno = -r; +- return -1; +- } +- +- return r; +-#else +- errno = ENOSYS; +- return -1; +-#endif +-} +- +- +-extern __typeof(__swapcontext) swapcontext __attribute__((weak, __alias__("__swapcontext"))); +-- +2.19.2 + |