system/libucontext: fix on PowerPC platforms (thanks @koorogi)

2 files changed, 540 insertions, 2 deletions

diff --git a/system/libucontext/APKBUILD b/system/libucontext/APKBUILD
index 30d179102..6cc2b0e64 100644
--- a/system/libucontext/APKBUILD
+++ b/system/libucontext/APKBUILD
@@ -1,7 +1,7 @@
 # Maintainer: 
 pkgname=libucontext
 pkgver=0.1.3
-pkgrel=3
+pkgrel=4
 pkgdesc="ucontext function implementations"
 url="https://git.dereferenced.org/kaniini/libucontext/"
 arch="all"
@@ -36,5 +36,5 @@ package() {
 }
 
 sha512sums="9e0694c09f159de714b655f6a4201a05c8d1871ee7376bb6bf824206b45475cfbd8269ca1caa75b9c322624d9f77d3fc3f938228a4bdd267a5ddceb57ca5c1ab  libucontext-0.1.3.tar.xz
-22627fc66e57f64c24a8fb0d6e64fda8abfc4f72cc7a9b3d4f06cdb2b406adacd3d1b7eaa0321133959557ed4ee6856bdf5aee764f3b90981ec5b41cc1e5cd91  powerpc.patch
+d0583c37915b62b3a5105e424e1e66f0b1f8c1ef5c28bcf4d02faf8803ef514cf4af71393c4cd027b552061b15f68f5227c50e0be8645cfe08d786cec4d9dcd9  powerpc.patch
 d63cf70c5226508f76dd1483a607e6e54417e062b7b77f3e70c7be244aff9cb81d19458b7f208bdf70c550aaa4da728eb91d9c280c461f64e6836c9d409f9aeb  static.patch"
diff --git a/system/libucontext/powerpc.patch b/system/libucontext/powerpc.patch
index e6df4cf25..ed7604d7b 100644
--- a/system/libucontext/powerpc.patch
+++ b/system/libucontext/powerpc.patch
@@ -1,3 +1,541 @@
+From 94216c60c43a30e39fbc4f347450768699c6c77c Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Mon, 1 Apr 2019 23:02:12 -0500
+Subject: [PATCH] test ability to pass 10 args through makecontext
+
+---
+ test_libucontext.c | 23 +++++++++++++++++++++--
+ 1 file changed, 21 insertions(+), 2 deletions(-)
+
+diff --git a/test_libucontext.c b/test_libucontext.c
+index 121cc3e..e5eac83 100644
+--- a/test_libucontext.c
++++ b/test_libucontext.c
+@@ -6,13 +6,32 @@
+ #include <stdio.h>
+ #include <ucontext.h>
+ #include <stdint.h>
++#include <stdlib.h>
+ #include <string.h>
+ 
+ 
+ static ucontext_t ctx[3];
+ 
+ 
+-static void f1 (void) {
++static void check_arg(int actual, int expected) {
++	if (actual == expected) return;
++	fprintf(stderr, "argument has wrong value.  got %d, expected %d.\n", actual, expected);
++	abort();
++}
++
++
++static void f1 (int a, int b, int c, int d, int e, int f, int g, int h, int i, int j) {
++	check_arg(a, 1);
++	check_arg(b, 2);
++	check_arg(c, 3);
++	check_arg(d, 4);
++	check_arg(e, 5);
++	check_arg(f, 6);
++	check_arg(g, 7);
++	check_arg(h, 8);
++	check_arg(i, 9);
++	check_arg(j, 10);
++
+ 	printf("start f1\n");
+ 	swapcontext(&ctx[1], &ctx[2]);
+ 	printf("finish f1\n");
+@@ -40,7 +59,7 @@ int main (int argc, const char *argv[]) {
+ 	ctx[1].uc_stack.ss_sp = st1;
+ 	ctx[1].uc_stack.ss_size = sizeof st1;
+ 	ctx[1].uc_link = &ctx[0];
+-	makecontext(&ctx[1], f1, 0);
++	makecontext(&ctx[1], f1, 10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
+ 
+ 
+ 	getcontext(&ctx[2]);
+From cb59e7ee957b389578a3f973484ae3198f6cfed1 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Mon, 1 Apr 2019 23:03:21 -0500
+Subject: [PATCH] test calls to getcontext without makecontext
+
+---
+ test_libucontext.c | 12 ++++++++++++
+ 1 file changed, 12 insertions(+)
+
+diff --git a/test_libucontext.c b/test_libucontext.c
+index e5eac83..a4a9b4c 100644
+--- a/test_libucontext.c
++++ b/test_libucontext.c
+@@ -48,6 +48,7 @@ static void f2 (void) {
+ int main (int argc, const char *argv[]) {
+ 	char st1[8192];
+ 	char st2[8192];
++	volatile int done = 0;
+ 
+ 
+ 	/* poison each coroutine's stack memory for debugging purposes */
+@@ -70,5 +71,16 @@ int main (int argc, const char *argv[]) {
+ 
+ 
+ 	swapcontext(&ctx[0], &ctx[2]);
++
++
++	/* test ability to use getcontext/setcontext without makecontext */
++	getcontext(&ctx[1]);
++	printf("done = %d\n", done);
++	if (done++ == 0) setcontext(&ctx[1]);
++	if (done != 2) {
++		fprintf(stderr, "wrong value for done.  got %d, expected 2\n", done);
++		abort();
++	}
++
+ 	return 0;
+ }
+From b6a9b5e279123f16569e0fd9f8ff14ff04bed7a3 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 13:32:03 -0500
+Subject: [PATCH] ppc32: fix stack alignment
+
+The stack should be 16-byte aligned, not 8 mod 16.
+---
+ arch/ppc/makecontext.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index c562ea5..1b9efdf 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -37,7 +37,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+ 	sp -= (uc_link + 1);
+-	sp = (greg_t *) (((uintptr_t) sp & -16L) - 8);
++	sp = (greg_t *) ((uintptr_t) sp & -16L);
+ 
+ 	ucp->uc_mcontext.gregs[REG_NIP]  = (uintptr_t) func;
+ 	ucp->uc_mcontext.gregs[REG_LNK]  = (uintptr_t) &__start_context;
+From b9bd4045fb34f060d6cf37fc7da7ab13b91462de Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 13:35:00 -0500
+Subject: [PATCH] ppc32/64: fix back chain pointer
+
+The ABI states that sp[0] should point to the previous stack frame, or be
+zero if there is no previous stack frame.  makecontext previously set this
+slot to point to the __start_context function, rather than to a valid
+stack frame.
+---
+ arch/ppc/makecontext.c   | 2 +-
+ arch/ppc64/makecontext.c | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 1b9efdf..729f465 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -44,7 +44,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	ucp->uc_mcontext.gregs[REG_R31]  = (uintptr_t) ucp->uc_link;
+ 	ucp->uc_mcontext.gregs[REG_SP]   = (uintptr_t) sp;
+ 
+-	sp[0] = (uintptr_t) &__start_context;
++	sp[0] = 0;
+ 	sp[uc_link] = (uintptr_t) ucp->uc_link;
+ 	argp = &sp[2];
+ 
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 9d6b998..91fb579 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -45,7 +45,7 @@ __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[0] = 0;
+ 	sp[uc_link] = (uintptr_t) ucp->uc_link;
+ 	argp = &sp[2];
+ 
+From b500b054c7cf412a6042496afa08b4302f7ed929 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 13:38:36 -0500
+Subject: [PATCH] ppc32/64: don't store uc_link on the stack
+
+This was previously stored either in the CR (ppc64) or LR (ppc32) save
+area of the stack, or to one of the parameter save slots.
+
+In either case, the saved value was unused.  This value is also passed
+to __start_context via r31, so there's no need to pass it on the stack.
+---
+ arch/ppc/makecontext.c   | 6 ++----
+ arch/ppc64/makecontext.c | 6 ++----
+ 2 files changed, 4 insertions(+), 8 deletions(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 729f465..2b7ea67 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -30,13 +30,12 @@ __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;
+ 
+ 	stack_args = argc > 8 ? argc - 8 : 0;
+-	uc_link = stack_args + 1;
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+-	sp -= (uc_link + 1);
++	sp -= stack_args + 2;
+ 	sp = (greg_t *) ((uintptr_t) sp & -16L);
+ 
+ 	ucp->uc_mcontext.gregs[REG_NIP]  = (uintptr_t) func;
+@@ -45,7 +44,6 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	ucp->uc_mcontext.gregs[REG_SP]   = (uintptr_t) sp;
+ 
+ 	sp[0] = 0;
+-	sp[uc_link] = (uintptr_t) ucp->uc_link;
+ 	argp = &sp[2];
+ 
+ 	va_start(va, argc);
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 91fb579..b060371 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -30,13 +30,12 @@ __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;
+ 
+ 	stack_args = argc > 8 ? argc - 8 : 0;
+-	uc_link = stack_args + 1;
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+-	sp -= (uc_link + 1);
++	sp -= stack_args + 2;
+ 	sp = (greg_t *) (((uintptr_t) sp & -16L));
+ 
+ 	ucp->uc_mcontext.gp_regs[REG_NIP]   = (uintptr_t) func;
+@@ -46,7 +45,6 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	ucp->uc_mcontext.gp_regs[REG_R31]   = (uintptr_t) ucp->uc_link;
+ 
+ 	sp[0] = 0;
+-	sp[uc_link] = (uintptr_t) ucp->uc_link;
+ 	argp = &sp[2];
+ 
+ 	va_start(va, argc);
+From 55168fcb1809dde45c99450f1f3be27716c473db Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 13:57:53 -0500
+Subject: [PATCH] ppc32/64: simplify storage of stack parameters
+
+The switch statement is simpler as an if/else, and removing the argp
+variable makes the code more symmetric between the register and stack
+parameter cases.
+---
+ arch/ppc/makecontext.c   | 24 ++++++------------------
+ arch/ppc64/makecontext.c | 24 ++++++------------------
+ 2 files changed, 12 insertions(+), 36 deletions(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 2b7ea67..4a404a4 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -27,7 +27,7 @@ extern void __start_context(void);
+ void
+ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ {
+-	greg_t *sp, *argp;
++	greg_t *sp;
+ 	va_list va;
+ 	int i;
+ 	unsigned int stack_args;
+@@ -44,27 +44,15 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	ucp->uc_mcontext.gregs[REG_SP]   = (uintptr_t) sp;
+ 
+ 	sp[0] = 0;
+-	argp = &sp[2];
+ 
+ 	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:
++	for (i = 0; i < argc; i++) {
++		if (i < 8)
+ 			ucp->uc_mcontext.gregs[i + 3] = va_arg (va, greg_t);
+-			break;
+-		default:
+-			*argp++ = va_arg (va, greg_t);
+-			break;
+-		}
++		else
++			sp[i-8 + 2] = va_arg (va, greg_t);
++	}
+ 
+ 	va_end(va);
+ }
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index b060371..962f98a 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -27,7 +27,7 @@ extern void __start_context(void);
+ void
+ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ {
+-	greg_t *sp, *argp;
++	greg_t *sp;
+ 	va_list va;
+ 	int i;
+ 	unsigned int stack_args;
+@@ -45,27 +45,15 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	ucp->uc_mcontext.gp_regs[REG_R31]   = (uintptr_t) ucp->uc_link;
+ 
+ 	sp[0] = 0;
+-	argp = &sp[2];
+ 
+ 	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:
++	for (i = 0; i < argc; i++) {
++		if (i < 8)
+ 			ucp->uc_mcontext.gp_regs[i + 3] = va_arg (va, greg_t);
+-			break;
+-		default:
+-			*argp++ = va_arg (va, greg_t);
+-			break;
+-		}
++		else
++			sp[i-8 + 2] = va_arg (va, greg_t);
++	}
+ 
+ 	va_end(va);
+ }
+From 8ea5f548b9146ffeea2074a33a06bbbd07a74402 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:01:10 -0500
+Subject: [PATCH] ppc64: fix makecontext with more than 8 parameters
+
+The ELFv2 ABI used on PPC64 differs from the ELFv1 ABI used on PPC32 here.
+On PPC64, once there are any parameters that need to be passed on the
+stack, space needs to be reserved on the stack to pass all parameters.
+Parameters 0-7 are still only passed by register, but if the callee needs
+to spill them, it can use the stack space reserved for the corresponding
+parameter to do so.
+---
+ arch/ppc64/makecontext.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 962f98a..ea980e9 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -32,7 +32,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	int i;
+ 	unsigned int stack_args;
+ 
+-	stack_args = argc > 8 ? argc - 8 : 0;
++	stack_args = argc > 8 ? argc : 0;
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+ 	sp -= stack_args + 2;
+@@ -52,7 +52,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 		if (i < 8)
+ 			ucp->uc_mcontext.gp_regs[i + 3] = va_arg (va, greg_t);
+ 		else
+-			sp[i-8 + 2] = va_arg (va, greg_t);
++			sp[i + 2] = va_arg (va, greg_t);
+ 	}
+ 
+ 	va_end(va);
+From a00a05ce2950ca3b306f8ccc3e817ea8cd675015 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:03:47 -0500
+Subject: [PATCH] ppc64: fix incorrect position of parameters within stack
+ frame
+
+On PPC64, there are 4 register-sized stack slots below the parameter save
+area, which is different from the 2 stack slots on PPC32.
+---
+ arch/ppc64/makecontext.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index ea980e9..a4c1bf9 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -35,7 +35,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 	stack_args = argc > 8 ? argc : 0;
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+-	sp -= stack_args + 2;
++	sp -= stack_args + 4;
+ 	sp = (greg_t *) (((uintptr_t) sp & -16L));
+ 
+ 	ucp->uc_mcontext.gp_regs[REG_NIP]   = (uintptr_t) func;
+@@ -52,7 +52,7 @@ __makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+ 		if (i < 8)
+ 			ucp->uc_mcontext.gp_regs[i + 3] = va_arg (va, greg_t);
+ 		else
+-			sp[i + 2] = va_arg (va, greg_t);
++			sp[i + 4] = va_arg (va, greg_t);
+ 	}
+ 
+ 	va_end(va);
+From 40d07758a5677e8869d7a62a499236bb6ed01897 Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:09:25 -0500
+Subject: [PATCH] ppc32/64: correct signature of function parameter to
+ makecontext
+
+Because makecontext can pass a set of integer arguments to the provided
+function, it is incorrect to require that this function accept no
+parameters.
+---
+ arch/ppc/makecontext.c   | 2 +-
+ arch/ppc64/makecontext.c | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 4a404a4..0633c0f 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -25,7 +25,7 @@ extern void __start_context(void);
+ 
+ 
+ void
+-__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
++__makecontext(ucontext_t *ucp, void (*func)(), int argc, ...)
+ {
+ 	greg_t *sp;
+ 	va_list va;
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index a4c1bf9..8a293b5 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -25,7 +25,7 @@ extern void __start_context(void);
+ 
+ 
+ void
+-__makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
++__makecontext(ucontext_t *ucp, void (*func)(), int argc, ...)
+ {
+ 	greg_t *sp;
+ 	va_list va;
+From edf69879eadaec0c72ba7ef5e7d2389946c6644b Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:09:39 -0500
+Subject: [PATCH] ppc64: remove unnecessary parentheses
+
+---
+ arch/ppc64/makecontext.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 8a293b5..84d390a 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -36,7 +36,7 @@ __makecontext(ucontext_t *ucp, void (*func)(), int argc, ...)
+ 
+ 	sp = (greg_t *) ((uintptr_t) ucp->uc_stack.ss_sp + ucp->uc_stack.ss_size);
+ 	sp -= stack_args + 4;
+-	sp = (greg_t *) (((uintptr_t) sp & -16L));
++	sp = (greg_t *) ((uintptr_t) sp & -16L);
+ 
+ 	ucp->uc_mcontext.gp_regs[REG_NIP]   = (uintptr_t) func;
+ 	ucp->uc_mcontext.gp_regs[REG_LNK]   = (uintptr_t) &__start_context;
+From 29eac4259adfd85e0f4946a1080bb9e3f8c0cc2e Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:10:28 -0500
+Subject: [PATCH] ppc32/64: remove unused includes
+
+---
+ arch/ppc/makecontext.c   | 2 --
+ arch/ppc64/makecontext.c | 2 --
+ 2 files changed, 4 deletions(-)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 0633c0f..7214a40 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/makecontext.c
+@@ -11,10 +11,8 @@
+  */
+ 
+ #define _GNU_SOURCE
+-#include <stddef.h>
+ #include <stdarg.h>
+ #include <signal.h>
+-#include <string.h>
+ #include <stdint.h>
+ 
+ 
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 84d390a..2650f56 100644
+--- a/arch/ppc64/makecontext.c
++++ b/arch/ppc64/makecontext.c
+@@ -11,10 +11,8 @@
+  */
+ 
+ #define _GNU_SOURCE
+-#include <stddef.h>
+ #include <stdarg.h>
+ #include <signal.h>
+-#include <string.h>
+ #include <stdint.h>
+ 
+ 
+From 90ff6330e62c8f836016668c9f769af365b257cb Mon Sep 17 00:00:00 2001
+From: Bobby Bingham <koorogi@koorogi.info>
+Date: Fri, 5 Apr 2019 14:11:21 -0500
+Subject: [PATCH] ppc32/64: update copyright
+
+---
+ arch/ppc/makecontext.c   | 1 +
+ arch/ppc64/makecontext.c | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/arch/ppc/makecontext.c b/arch/ppc/makecontext.c
+index 7214a40..51c492f 100644
+--- a/arch/ppc/makecontext.c
++++ b/arch/ppc/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
+diff --git a/arch/ppc64/makecontext.c b/arch/ppc64/makecontext.c
+index 2650f56..43da557 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
 From 2610c7faa7b9c4114d53bb659264a6be238cd2a3 Mon Sep 17 00:00:00 2001
 From: Bobby Bingham <koorogi@koorogi.info>
 Date: Sat, 23 Feb 2019 17:12:37 -0600