add support for Qemu ARM noMMU

Greg Ungerer made me aware of this possibility.
Rather hackish implementation, we need to deduplicate later.
Update Linux Kernel to 4.4.19 while there.
Only non-Devicetree system supported right now.

1 files changed, 0 insertions, 319 deletions

diff --git a/target/linux/patches/4.4.17/revert-sparc.patch b/target/linux/patches/4.4.17/revert-sparc.patch
deleted file mode 100644
index 296be0e4a..000000000
--- a/target/linux/patches/4.4.17/revert-sparc.patch
+++ /dev/null
@@ -1,319 +0,0 @@
-From fff1ade5bd7576b053b6bbc9c9b72c2572092c06 Mon Sep 17 00:00:00 2001
-From: Waldemar Brodkorb <wbx@uclibc-ng.org>
-Date: Wed, 6 Jul 2016 08:16:59 +0200
-Subject: [PATCH] Revert "sparc: Harden signal return frame checks."
-
-This reverts commit 1fda90c39d8ef6acbedfd3cd9bd710a5bcc490c3.
-
-Signed-off-by: Waldemar Brodkorb <wbx@uclibc-ng.org>
----
- arch/sparc/kernel/signal32.c   |   46 ++++++++++++++--------------------------
- arch/sparc/kernel/signal_32.c  |   41 +++++++++++++----------------------
- arch/sparc/kernel/signal_64.c  |   31 ++++++++++-----------------
- arch/sparc/kernel/sigutil_32.c |    9 +-------
- arch/sparc/kernel/sigutil_64.c |   10 ++-------
- 5 files changed, 45 insertions(+), 92 deletions(-)
-
-diff --git a/arch/sparc/kernel/signal32.c b/arch/sparc/kernel/signal32.c
-index 77655f0..4eed773 100644
---- a/arch/sparc/kernel/signal32.c
-+++ b/arch/sparc/kernel/signal32.c
-@@ -138,24 +138,12 @@ int copy_siginfo_from_user32(siginfo_t *to, compat_siginfo_t __user *from)
- 	return 0;
- }
- 
--/* Checks if the fp is valid.  We always build signal frames which are
-- * 16-byte aligned, therefore we can always enforce that the restore
-- * frame has that property as well.
-- */
--static bool invalid_frame_pointer(void __user *fp, int fplen)
--{
--	if ((((unsigned long) fp) & 15) ||
--	    ((unsigned long)fp) > 0x100000000ULL - fplen)
--		return true;
--	return false;
--}
--
- void do_sigreturn32(struct pt_regs *regs)
- {
- 	struct signal_frame32 __user *sf;
- 	compat_uptr_t fpu_save;
- 	compat_uptr_t rwin_save;
--	unsigned int psr, ufp;
-+	unsigned int psr;
- 	unsigned pc, npc;
- 	sigset_t set;
- 	compat_sigset_t seta;
-@@ -170,16 +158,11 @@ void do_sigreturn32(struct pt_regs *regs)
- 	sf = (struct signal_frame32 __user *) regs->u_regs[UREG_FP];
- 
- 	/* 1. Make sure we are not getting garbage from the user */
--	if (invalid_frame_pointer(sf, sizeof(*sf)))
--		goto segv;
--
--	if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
--		goto segv;
--
--	if (ufp & 0x7)
-+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+	    (((unsigned long) sf) & 3))
- 		goto segv;
- 
--	if (__get_user(pc, &sf->info.si_regs.pc) ||
-+	if (get_user(pc, &sf->info.si_regs.pc) ||
- 	    __get_user(npc, &sf->info.si_regs.npc))
- 		goto segv;
- 
-@@ -244,7 +227,7 @@ segv:
- asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
- {
- 	struct rt_signal_frame32 __user *sf;
--	unsigned int psr, pc, npc, ufp;
-+	unsigned int psr, pc, npc;
- 	compat_uptr_t fpu_save;
- 	compat_uptr_t rwin_save;
- 	sigset_t set;
-@@ -259,16 +242,11 @@ asmlinkage void do_rt_sigreturn32(struct pt_regs *regs)
- 	sf = (struct rt_signal_frame32 __user *) regs->u_regs[UREG_FP];
- 
- 	/* 1. Make sure we are not getting garbage from the user */
--	if (invalid_frame_pointer(sf, sizeof(*sf)))
-+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+	    (((unsigned long) sf) & 3))
- 		goto segv;
- 
--	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
--		goto segv;
--
--	if (ufp & 0x7)
--		goto segv;
--
--	if (__get_user(pc, &sf->regs.pc) ||
-+	if (get_user(pc, &sf->regs.pc) || 
- 	    __get_user(npc, &sf->regs.npc))
- 		goto segv;
- 
-@@ -329,6 +307,14 @@ segv:
- 	force_sig(SIGSEGV, current);
- }
- 
-+/* Checks if the fp is valid */
-+static int invalid_frame_pointer(void __user *fp, int fplen)
-+{
-+	if ((((unsigned long) fp) & 7) || ((unsigned long)fp) > 0x100000000ULL - fplen)
-+		return 1;
-+	return 0;
-+}
-+
- static void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- 	unsigned long sp;
-diff --git a/arch/sparc/kernel/signal_32.c b/arch/sparc/kernel/signal_32.c
-index c3c12ef..52aa5e4 100644
---- a/arch/sparc/kernel/signal_32.c
-+++ b/arch/sparc/kernel/signal_32.c
-@@ -60,22 +60,10 @@ struct rt_signal_frame {
- #define SF_ALIGNEDSZ  (((sizeof(struct signal_frame) + 7) & (~7)))
- #define RT_ALIGNEDSZ  (((sizeof(struct rt_signal_frame) + 7) & (~7)))
- 
--/* Checks if the fp is valid.  We always build signal frames which are
-- * 16-byte aligned, therefore we can always enforce that the restore
-- * frame has that property as well.
-- */
--static inline bool invalid_frame_pointer(void __user *fp, int fplen)
--{
--	if ((((unsigned long) fp) & 15) || !__access_ok((unsigned long)fp, fplen))
--		return true;
--
--	return false;
--}
--
- asmlinkage void do_sigreturn(struct pt_regs *regs)
- {
--	unsigned long up_psr, pc, npc, ufp;
- 	struct signal_frame __user *sf;
-+	unsigned long up_psr, pc, npc;
- 	sigset_t set;
- 	__siginfo_fpu_t __user *fpu_save;
- 	__siginfo_rwin_t __user *rwin_save;
-@@ -89,13 +77,10 @@ asmlinkage void do_sigreturn(struct pt_regs *regs)
- 	sf = (struct signal_frame __user *) regs->u_regs[UREG_FP];
- 
- 	/* 1. Make sure we are not getting garbage from the user */
--	if (!invalid_frame_pointer(sf, sizeof(*sf)))
--		goto segv_and_exit;
--
--	if (get_user(ufp, &sf->info.si_regs.u_regs[UREG_FP]))
-+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)))
- 		goto segv_and_exit;
- 
--	if (ufp & 0x7)
-+	if (((unsigned long) sf) & 3)
- 		goto segv_and_exit;
- 
- 	err = __get_user(pc,  &sf->info.si_regs.pc);
-@@ -142,7 +127,7 @@ segv_and_exit:
- asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
- {
- 	struct rt_signal_frame __user *sf;
--	unsigned int psr, pc, npc, ufp;
-+	unsigned int psr, pc, npc;
- 	__siginfo_fpu_t __user *fpu_save;
- 	__siginfo_rwin_t __user *rwin_save;
- 	sigset_t set;
-@@ -150,13 +135,8 @@ asmlinkage void do_rt_sigreturn(struct pt_regs *regs)
- 
- 	synchronize_user_stack();
- 	sf = (struct rt_signal_frame __user *) regs->u_regs[UREG_FP];
--	if (!invalid_frame_pointer(sf, sizeof(*sf)))
--		goto segv;
--
--	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
--		goto segv;
--
--	if (ufp & 0x7)
-+	if (!access_ok(VERIFY_READ, sf, sizeof(*sf)) ||
-+	    (((unsigned long) sf) & 0x03))
- 		goto segv;
- 
- 	err = __get_user(pc, &sf->regs.pc);
-@@ -198,6 +178,15 @@ segv:
- 	force_sig(SIGSEGV, current);
- }
- 
-+/* Checks if the fp is valid */
-+static inline int invalid_frame_pointer(void __user *fp, int fplen)
-+{
-+	if ((((unsigned long) fp) & 7) || !__access_ok((unsigned long)fp, fplen))
-+		return 1;
-+
-+	return 0;
-+}
-+
- static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- 	unsigned long sp = regs->u_regs[UREG_FP];
-diff --git a/arch/sparc/kernel/signal_64.c b/arch/sparc/kernel/signal_64.c
-index 5ee930c..39aaec1 100644
---- a/arch/sparc/kernel/signal_64.c
-+++ b/arch/sparc/kernel/signal_64.c
-@@ -234,17 +234,6 @@ do_sigsegv:
- 	goto out;
- }
- 
--/* Checks if the fp is valid.  We always build rt signal frames which
-- * are 16-byte aligned, therefore we can always enforce that the
-- * restore frame has that property as well.
-- */
--static bool invalid_frame_pointer(void __user *fp)
--{
--	if (((unsigned long) fp) & 15)
--		return true;
--	return false;
--}
--
- struct rt_signal_frame {
- 	struct sparc_stackf	ss;
- 	siginfo_t		info;
-@@ -257,8 +246,8 @@ struct rt_signal_frame {
- 
- void do_rt_sigreturn(struct pt_regs *regs)
- {
--	unsigned long tpc, tnpc, tstate, ufp;
- 	struct rt_signal_frame __user *sf;
-+	unsigned long tpc, tnpc, tstate;
- 	__siginfo_fpu_t __user *fpu_save;
- 	__siginfo_rwin_t __user *rwin_save;
- 	sigset_t set;
-@@ -272,16 +261,10 @@ void do_rt_sigreturn(struct pt_regs *regs)
- 		(regs->u_regs [UREG_FP] + STACK_BIAS);
- 
- 	/* 1. Make sure we are not getting garbage from the user */
--	if (invalid_frame_pointer(sf))
--		goto segv;
--
--	if (get_user(ufp, &sf->regs.u_regs[UREG_FP]))
-+	if (((unsigned long) sf) & 3)
- 		goto segv;
- 
--	if ((ufp + STACK_BIAS) & 0x7)
--		goto segv;
--
--	err = __get_user(tpc, &sf->regs.tpc);
-+	err = get_user(tpc, &sf->regs.tpc);
- 	err |= __get_user(tnpc, &sf->regs.tnpc);
- 	if (test_thread_flag(TIF_32BIT)) {
- 		tpc &= 0xffffffff;
-@@ -325,6 +308,14 @@ segv:
- 	force_sig(SIGSEGV, current);
- }
- 
-+/* Checks if the fp is valid */
-+static int invalid_frame_pointer(void __user *fp)
-+{
-+	if (((unsigned long) fp) & 15)
-+		return 1;
-+	return 0;
-+}
-+
- static inline void __user *get_sigframe(struct ksignal *ksig, struct pt_regs *regs, unsigned long framesize)
- {
- 	unsigned long sp = regs->u_regs[UREG_FP] + STACK_BIAS;
-diff --git a/arch/sparc/kernel/sigutil_32.c b/arch/sparc/kernel/sigutil_32.c
-index e5fe8ce..0f6eebe 100644
---- a/arch/sparc/kernel/sigutil_32.c
-+++ b/arch/sparc/kernel/sigutil_32.c
-@@ -48,10 +48,6 @@ int save_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
- int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
- {
- 	int err;
--
--	if (((unsigned long) fpu) & 3)
--		return -EFAULT;
--
- #ifdef CONFIG_SMP
- 	if (test_tsk_thread_flag(current, TIF_USEDFPU))
- 		regs->psr &= ~PSR_EF;
-@@ -101,10 +97,7 @@ int restore_rwin_state(__siginfo_rwin_t __user *rp)
- 	struct thread_info *t = current_thread_info();
- 	int i, wsaved, err;
- 
--	if (((unsigned long) rp) & 3)
--		return -EFAULT;
--
--	get_user(wsaved, &rp->wsaved);
-+	__get_user(wsaved, &rp->wsaved);
- 	if (wsaved > NSWINS)
- 		return -EFAULT;
- 
-diff --git a/arch/sparc/kernel/sigutil_64.c b/arch/sparc/kernel/sigutil_64.c
-index 36aadcb..387834a 100644
---- a/arch/sparc/kernel/sigutil_64.c
-+++ b/arch/sparc/kernel/sigutil_64.c
-@@ -37,10 +37,7 @@ int restore_fpu_state(struct pt_regs *regs, __siginfo_fpu_t __user *fpu)
- 	unsigned long fprs;
- 	int err;
- 
--	if (((unsigned long) fpu) & 7)
--		return -EFAULT;
--
--	err = get_user(fprs, &fpu->si_fprs);
-+	err = __get_user(fprs, &fpu->si_fprs);
- 	fprs_write(0);
- 	regs->tstate &= ~TSTATE_PEF;
- 	if (fprs & FPRS_DL)
-@@ -75,10 +72,7 @@ int restore_rwin_state(__siginfo_rwin_t __user *rp)
- 	struct thread_info *t = current_thread_info();
- 	int i, wsaved, err;
- 
--	if (((unsigned long) rp) & 7)
--		return -EFAULT;
--
--	get_user(wsaved, &rp->wsaved);
-+	__get_user(wsaved, &rp->wsaved);
- 	if (wsaved > NSWINS)
- 		return -EFAULT;
- 
--- 
-1.7.10.4
-