Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
new file mode 100644
index 000000000..cfc77b694
--- /dev/null
+++ b/arch/mips/kernel/signal_n32.c
@@ -0,0 +1,148 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2003 Broadcom Corporation
+ */
+#include <linux/cache.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/kernel.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/wait.h>
+#include <linux/ptrace.h>
+#include <linux/unistd.h>
+#include <linux/compat.h>
+#include <linux/bitops.h>
+
+#include <asm/abi.h>
+#include <asm/asm.h>
+#include <asm/cacheflush.h>
+#include <asm/compat-signal.h>
+#include <asm/sim.h>
+#include <linux/uaccess.h>
+#include <asm/ucontext.h>
+#include <asm/fpu.h>
+#include <asm/cpu-features.h>
+
+#include "signal-common.h"
+
+/*
+ * Including <asm/unistd.h> would give use the 64-bit syscall numbers ...
+ */
+#define __NR_N32_restart_syscall	6214
+
+extern int setup_sigcontext(struct pt_regs *, struct sigcontext __user *);
+extern int restore_sigcontext(struct pt_regs *, struct sigcontext __user *);
+
+struct ucontextn32 {
+	u32		    uc_flags;
+	s32		    uc_link;
+	compat_stack_t      uc_stack;
+	struct sigcontext   uc_mcontext;
+	compat_sigset_t	    uc_sigmask;	  /* mask last for extensibility */
+};
+
+struct rt_sigframe_n32 {
+	u32 rs_ass[4];			/* argument save space for o32 */
+	u32 rs_pad[2];			/* Was: signal trampoline */
+	struct compat_siginfo rs_info;
+	struct ucontextn32 rs_uc;
+};
+
+asmlinkage void sysn32_rt_sigreturn(void)
+{
+	struct rt_sigframe_n32 __user *frame;
+	struct pt_regs *regs;
+	sigset_t set;
+	int sig;
+
+	regs = current_pt_regs();
+	frame = (struct rt_sigframe_n32 __user *)regs->regs[29];
+	if (!access_ok(frame, sizeof(*frame)))
+		goto badframe;
+	if (__copy_conv_sigset_from_user(&set, &frame->rs_uc.uc_sigmask))
+		goto badframe;
+
+	set_current_blocked(&set);
+
+	sig = restore_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+	if (sig < 0)
+		goto badframe;
+	else if (sig)
+		force_sig(sig);
+
+	if (compat_restore_altstack(&frame->rs_uc.uc_stack))
+		goto badframe;
+
+	/*
+	 * Don't let your children do this ...
+	 */
+	__asm__ __volatile__(
+		"move\t$29, %0\n\t"
+		"j\tsyscall_exit"
+		: /* no outputs */
+		: "r" (regs));
+	/* Unreached */
+
+badframe:
+	force_sig(SIGSEGV);
+}
+
+static int setup_rt_frame_n32(void *sig_return, struct ksignal *ksig,
+			      struct pt_regs *regs, sigset_t *set)
+{
+	struct rt_sigframe_n32 __user *frame;
+	int err = 0;
+
+	frame = get_sigframe(ksig, regs, sizeof(*frame));
+	if (!access_ok(frame, sizeof (*frame)))
+		return -EFAULT;
+
+	/* Create siginfo.  */
+	err |= copy_siginfo_to_user32(&frame->rs_info, &ksig->info);
+
+	/* Create the ucontext.	 */
+	err |= __put_user(0, &frame->rs_uc.uc_flags);
+	err |= __put_user(0, &frame->rs_uc.uc_link);
+	err |= __compat_save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
+	err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
+	err |= __copy_conv_sigset_to_user(&frame->rs_uc.uc_sigmask, set);
+
+	if (err)
+		return -EFAULT;
+
+	/*
+	 * Arguments to signal handler:
+	 *
+	 *   a0 = signal number
+	 *   a1 = 0 (should be cause)
+	 *   a2 = pointer to ucontext
+	 *
+	 * $25 and c0_epc point to the signal handler, $29 points to
+	 * the struct rt_sigframe.
+	 */
+	regs->regs[ 4] = ksig->sig;
+	regs->regs[ 5] = (unsigned long) &frame->rs_info;
+	regs->regs[ 6] = (unsigned long) &frame->rs_uc;
+	regs->regs[29] = (unsigned long) frame;
+	regs->regs[31] = (unsigned long) sig_return;
+	regs->cp0_epc = regs->regs[25] = (unsigned long) ksig->ka.sa.sa_handler;
+
+	DEBUGP("SIG deliver (%s:%d): sp=0x%p pc=0x%lx ra=0x%lx\n",
+	       current->comm, current->pid,
+	       frame, regs->cp0_epc, regs->regs[31]);
+
+	return 0;
+}
+
+struct mips_abi mips_abi_n32 = {
+	.setup_rt_frame = setup_rt_frame_n32,
+	.restart	= __NR_N32_restart_syscall,
+
+	.off_sc_fpregs = offsetof(struct sigcontext, sc_fpregs),
+	.off_sc_fpc_csr = offsetof(struct sigcontext, sc_fpc_csr),
+	.off_sc_used_math = offsetof(struct sigcontext, sc_used_math),
+
+	.vdso		= &vdso_image_n32,
+};