diff options
Diffstat (limited to 'system')
| -rw-r--r-- | system/libucontext/APKBUILD | 8 | ||||
| -rw-r--r-- | system/libucontext/ppc64-assembly.patch | 331 | ||||
| -rw-r--r-- | system/libucontext/ppc64-stack-layout.patch | 105 |
3 files changed, 442 insertions, 2 deletions
diff --git a/system/libucontext/APKBUILD b/system/libucontext/APKBUILD index 2adee39f2..f6b020858 100644 --- a/system/libucontext/APKBUILD +++ b/system/libucontext/APKBUILD @@ -1,7 +1,7 @@ # Maintainer: William Pitcock <nenolod@dereferenced.org> pkgname=libucontext pkgver=0.1.3 -pkgrel=0 +pkgrel=1 pkgdesc="ucontext function implementations" url="https://git.dereferenced.org/kaniini/libucontext/" arch="all" @@ -9,6 +9,8 @@ license="ISC" depends="" subpackages="$pkgname-dev" source="https://distfiles.dereferenced.org/libucontext/libucontext-$pkgver.tar.xz + ppc64-assembly.patch + ppc64-stack-layout.patch " case "$CTARGET_ARCH" in @@ -33,4 +35,6 @@ package() { make ARCH="$LIBUCONTEXT_ARCH" DESTDIR="$pkgdir" install } -sha512sums="9e0694c09f159de714b655f6a4201a05c8d1871ee7376bb6bf824206b45475cfbd8269ca1caa75b9c322624d9f77d3fc3f938228a4bdd267a5ddceb57ca5c1ab libucontext-0.1.3.tar.xz" +sha512sums="9e0694c09f159de714b655f6a4201a05c8d1871ee7376bb6bf824206b45475cfbd8269ca1caa75b9c322624d9f77d3fc3f938228a4bdd267a5ddceb57ca5c1ab libucontext-0.1.3.tar.xz +dbb7599fe5cc1e470d944bf741c393c13e684d6c27bd794ec380a05ba1ba045597b102903a1ac9bf586a508941440373c2d29fad1d7372ee8c72ffb7f0e11f75 ppc64-assembly.patch +d6219487a5aa456726a01a5a6a39c3a7f29bc24a66f2fc77ff7f852e1b45ffe64854ad92cafad3cc03d3b52bd77dce786ef125e3e88ddb0398833a560afb5211 ppc64-stack-layout.patch" 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 + diff --git a/system/libucontext/ppc64-stack-layout.patch b/system/libucontext/ppc64-stack-layout.patch new file mode 100644 index 000000000..d030b61af --- /dev/null +++ b/system/libucontext/ppc64-stack-layout.patch @@ -0,0 +1,105 @@ +From a17b01bc9df4004a1852ba272d452b0f46f5927c Mon Sep 17 00:00:00 2001 +From: Bobby Bingham <koorogi@koorogi.info> +Date: Tue, 19 Feb 2019 06:27:28 +0000 +Subject: [PATCH 3/3] ppc64: fix stack frame layout + +--- + arch/ppc64/makecontext.c | 48 +++++++++++++++++----------------------- + 1 file changed, 20 insertions(+), 28 deletions(-) + +diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c +index 9d6b998..6d9841c 100644 +--- a/arch/ppc64/makecontext.c ++++ b/arch/ppc64/makecontext.c +@@ -1,5 +1,6 @@ + /* + * Copyright (c) 2018 William Pitcock <nenolod@dereferenced.org> ++ * 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 +@@ -11,32 +12,39 @@ + */ + + #define _GNU_SOURCE +-#include <stddef.h> + #include <stdarg.h> + #include <signal.h> +-#include <string.h> + #include <stdint.h> + +- + #include "defs.h" + + + extern void __start_context(void); + + ++#define SAVEARG(i,val) \ ++ do { \ ++ *(i < 8 ? &ucp->uc_mcontext.gp_regs[3+i] : argp) = val; \ ++ argp++; \ ++ } while (0) ++ + void + __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) + { + greg_t *sp, *argp; + va_list va; +- int i; +- unsigned int uc_link, stack_args; ++ unsigned int stack_args; ++ ++ /* We pass uc_link as an argument, so in total we have argc+1 args */ ++ stack_args = argc + 1; + +- stack_args = argc > 8 ? argc - 8 : 0; +- uc_link = stack_args + 1; ++ /* We can pass 8 args before needing the stack. If any arg is passed ++ * on the stack, then stack space must be reserved for all args, even ++ * though the first 8 don't need to be stored there */ ++ if (stack_args <= 8) stack_args = 0; + + sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size); +- sp -= (uc_link + 1); ++ sp -= stack_args + 4; + sp = (greg_t *) (((uintptr_t) sp & -16L)); + + ucp->uc_mcontext.gp_regs[REG_NIP] = (uintptr_t) func; +@@ -45,29 +53,13 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...) + ucp->uc_mcontext.gp_regs[REG_ENTRY] = (uintptr_t) func; + ucp->uc_mcontext.gp_regs[REG_R31] = (uintptr_t) ucp->uc_link; + +- sp[0] = (uintptr_t) &__start_context; +- sp[uc_link] = (uintptr_t) ucp->uc_link; +- argp = &sp[2]; ++ sp[0] = 0; ++ argp = &sp[4]; + + va_start(va, argc); + +- for (i = 0; i < argc; i++) +- switch (i) +- { +- case 0: +- case 1: +- case 2: +- case 3: +- case 4: +- case 5: +- case 6: +- case 7: +- ucp->uc_mcontext.gp_regs[i + 3] = va_arg (va, greg_t); +- break; +- default: +- *argp++ = va_arg (va, greg_t); +- break; +- } ++ for (int i = 0; i < argc; i++) SAVEARG(i, va_arg(va, greg_t)); ++ SAVEARG(argc, (uintptr_t) ucp->uc_link); + + va_end(va); + } +-- +2.19.2 + |