Adding upstream version 5.10.209.upstream/5.10.209

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

1 files changed, 248 insertions, 0 deletions

diff --git a/arch/parisc/kernel/signal32.c b/arch/parisc/kernel/signal32.c
new file mode 100644
index 000000000..9a5ba57ad
--- /dev/null
+++ b/arch/parisc/kernel/signal32.c
@@ -0,0 +1,248 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*    Signal support for 32-bit kernel builds
+ *
+ *    Copyright (C) 2001 Matthew Wilcox <willy at parisc-linux.org>
+ *    Copyright (C) 2006 Kyle McMartin <kyle at parisc-linux.org>
+ *
+ *    Code was mostly borrowed from kernel/signal.c.
+ *    See kernel/signal.c for additional Copyrights.
+ */
+
+#include <linux/compat.h>
+#include <linux/module.h>
+#include <linux/unistd.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/syscalls.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+
+#include <linux/uaccess.h>
+
+#include "signal32.h"
+
+#define DEBUG_COMPAT_SIG 0 
+#define DEBUG_COMPAT_SIG_LEVEL 2
+
+#if DEBUG_COMPAT_SIG
+#define DBG(LEVEL, ...) \
+	((DEBUG_COMPAT_SIG_LEVEL >= LEVEL) \
+	? printk(__VA_ARGS__) : (void) 0)
+#else
+#define DBG(LEVEL, ...)
+#endif
+
+long
+restore_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf,
+		struct pt_regs *regs)
+{
+	long err = 0;
+	compat_uint_t compat_reg;
+	compat_uint_t compat_regt;
+	int regn;
+	
+	/* When loading 32-bit values into 64-bit registers make
+	   sure to clear the upper 32-bits */
+	DBG(2,"restore_sigcontext32: PER_LINUX32 process\n");
+	DBG(2,"restore_sigcontext32: sc = 0x%p, rf = 0x%p, regs = 0x%p\n", sc, rf, regs);
+	DBG(2,"restore_sigcontext32: compat_sigcontext is %#lx bytes\n", sizeof(*sc));
+	for(regn=0; regn < 32; regn++){
+		err |= __get_user(compat_reg,&sc->sc_gr[regn]);
+		regs->gr[regn] = compat_reg;
+		/* Load upper half */
+		err |= __get_user(compat_regt,&rf->rf_gr[regn]);
+		regs->gr[regn] = ((u64)compat_regt << 32) | (u64)compat_reg;
+		DBG(3,"restore_sigcontext32: gr%02d = %#lx (%#x / %#x)\n", 
+				regn, regs->gr[regn], compat_regt, compat_reg);
+	}
+	DBG(2,"restore_sigcontext32: sc->sc_fr = 0x%p (%#lx)\n",sc->sc_fr, sizeof(sc->sc_fr));
+	/* XXX: BE WARNED FR's are 64-BIT! */
+	err |= __copy_from_user(regs->fr, sc->sc_fr, sizeof(regs->fr));
+		
+	/* Better safe than sorry, pass __get_user two things of
+	   the same size and let gcc do the upward conversion to 
+	   64-bits */		
+	err |= __get_user(compat_reg, &sc->sc_iaoq[0]);
+	/* Load upper half */
+	err |= __get_user(compat_regt, &rf->rf_iaoq[0]);
+	regs->iaoq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
+	DBG(2,"restore_sigcontext32: upper half of iaoq[0] = %#lx\n", compat_regt);
+	DBG(2,"restore_sigcontext32: sc->sc_iaoq[0] = %p => %#x\n", 
+			&sc->sc_iaoq[0], compat_reg);
+
+	err |= __get_user(compat_reg, &sc->sc_iaoq[1]);
+	/* Load upper half */
+	err |= __get_user(compat_regt, &rf->rf_iaoq[1]);
+	regs->iaoq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
+	DBG(2,"restore_sigcontext32: upper half of iaoq[1] = %#lx\n", compat_regt);
+	DBG(2,"restore_sigcontext32: sc->sc_iaoq[1] = %p => %#x\n", 
+			&sc->sc_iaoq[1],compat_reg);	
+	DBG(2,"restore_sigcontext32: iaoq is %#lx / %#lx\n", 
+			regs->iaoq[0],regs->iaoq[1]);		
+		
+	err |= __get_user(compat_reg, &sc->sc_iasq[0]);
+	/* Load the upper half for iasq */
+	err |= __get_user(compat_regt, &rf->rf_iasq[0]);
+	regs->iasq[0] = ((u64)compat_regt << 32) | (u64)compat_reg;
+	DBG(2,"restore_sigcontext32: upper half of iasq[0] = %#lx\n", compat_regt);
+	
+	err |= __get_user(compat_reg, &sc->sc_iasq[1]);
+	/* Load the upper half for iasq */
+	err |= __get_user(compat_regt, &rf->rf_iasq[1]);
+	regs->iasq[1] = ((u64)compat_regt << 32) | (u64)compat_reg;
+	DBG(2,"restore_sigcontext32: upper half of iasq[1] = %#lx\n", compat_regt);
+	DBG(2,"restore_sigcontext32: iasq is %#lx / %#lx\n", 
+		regs->iasq[0],regs->iasq[1]);		
+
+	err |= __get_user(compat_reg, &sc->sc_sar);
+	/* Load the upper half for sar */
+	err |= __get_user(compat_regt, &rf->rf_sar);
+	regs->sar = ((u64)compat_regt << 32) | (u64)compat_reg;	
+	DBG(2,"restore_sigcontext32: upper_half & sar = %#lx\n", compat_regt);	
+	DBG(2,"restore_sigcontext32: sar is %#lx\n", regs->sar);		
+	DBG(2,"restore_sigcontext32: r28 is %ld\n", regs->gr[28]);
+	
+	return err;
+}
+
+/*
+ * Set up the sigcontext structure for this process.
+ * This is not an easy task if the kernel is 64-bit, it will require
+ * that we examine the process personality to determine if we need to
+ * truncate for a 32-bit userspace.
+ */
+long
+setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __user * rf, 
+		struct pt_regs *regs, int in_syscall)		 
+{
+	compat_int_t flags = 0;
+	long err = 0;
+	compat_uint_t compat_reg;
+	compat_uint_t compat_regb;
+	int regn;
+	
+	if (on_sig_stack((unsigned long) sc))
+		flags |= PARISC_SC_FLAG_ONSTACK;
+	
+	if (in_syscall) {
+		
+		DBG(1,"setup_sigcontext32: in_syscall\n");
+		
+		flags |= PARISC_SC_FLAG_IN_SYSCALL;
+		/* Truncate gr31 */
+		compat_reg = (compat_uint_t)(regs->gr[31]);
+		/* regs->iaoq is undefined in the syscall return path */
+		err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
+		DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
+				&sc->sc_iaoq[0], compat_reg);
+		
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->gr[31] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iaoq[0]);
+		DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
+		
+		
+		compat_reg = (compat_uint_t)(regs->gr[31]+4);
+		err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
+		DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
+				&sc->sc_iaoq[1], compat_reg);
+		/* Store upper half */
+		compat_reg = (compat_uint_t)((regs->gr[31]+4) >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
+		DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
+		
+		/* Truncate sr3 */
+		compat_reg = (compat_uint_t)(regs->sr[3]);
+		err |= __put_user(compat_reg, &sc->sc_iasq[0]);
+		err |= __put_user(compat_reg, &sc->sc_iasq[1]);		
+		
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->sr[3] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iasq[0]);
+		err |= __put_user(compat_reg, &rf->rf_iasq[1]);		
+		
+		DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
+		DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);		
+		DBG(1,"setup_sigcontext32: iaoq %#lx / %#lx\n",				
+			regs->gr[31], regs->gr[31]+4);
+		
+	} else {
+		
+		compat_reg = (compat_uint_t)(regs->iaoq[0]);
+		err |= __put_user(compat_reg, &sc->sc_iaoq[0]);
+		DBG(2,"setup_sigcontext32: sc->sc_iaoq[0] = %p <= %#x\n",
+				&sc->sc_iaoq[0], compat_reg);
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->iaoq[0] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iaoq[0]);	
+		DBG(2,"setup_sigcontext32: upper half iaoq[0] = %#x\n", compat_reg);
+		
+		compat_reg = (compat_uint_t)(regs->iaoq[1]);
+		err |= __put_user(compat_reg, &sc->sc_iaoq[1]);
+		DBG(2,"setup_sigcontext32: sc->sc_iaoq[1] = %p <= %#x\n",
+				&sc->sc_iaoq[1], compat_reg);
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->iaoq[1] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iaoq[1]);
+		DBG(2,"setup_sigcontext32: upper half iaoq[1] = %#x\n", compat_reg);
+		
+		
+		compat_reg = (compat_uint_t)(regs->iasq[0]);
+		err |= __put_user(compat_reg, &sc->sc_iasq[0]);
+		DBG(2,"setup_sigcontext32: sc->sc_iasq[0] = %p <= %#x\n",
+				&sc->sc_iasq[0], compat_reg);
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->iasq[0] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iasq[0]);
+		DBG(2,"setup_sigcontext32: upper half iasq[0] = %#x\n", compat_reg);
+		
+		
+		compat_reg = (compat_uint_t)(regs->iasq[1]);
+		err |= __put_user(compat_reg, &sc->sc_iasq[1]);
+		DBG(2,"setup_sigcontext32: sc->sc_iasq[1] = %p <= %#x\n",
+				&sc->sc_iasq[1], compat_reg);
+		/* Store upper half */
+		compat_reg = (compat_uint_t)(regs->iasq[1] >> 32);
+		err |= __put_user(compat_reg, &rf->rf_iasq[1]);
+		DBG(2,"setup_sigcontext32: upper half iasq[1] = %#x\n", compat_reg);
+
+		/* Print out the IAOQ for debugging */		
+		DBG(1,"setup_sigcontext32: ia0q %#lx / %#lx\n", 
+			regs->iaoq[0], regs->iaoq[1]);
+	}
+
+	err |= __put_user(flags, &sc->sc_flags);
+	
+	DBG(1,"setup_sigcontext32: Truncating general registers.\n");
+	
+	for(regn=0; regn < 32; regn++){
+		/* Truncate a general register */
+		compat_reg = (compat_uint_t)(regs->gr[regn]);
+		err |= __put_user(compat_reg, &sc->sc_gr[regn]);
+		/* Store upper half */
+		compat_regb = (compat_uint_t)(regs->gr[regn] >> 32);
+		err |= __put_user(compat_regb, &rf->rf_gr[regn]);
+
+		/* DEBUG: Write out the "upper / lower" register data */
+		DBG(2,"setup_sigcontext32: gr%02d = %#x / %#x\n", regn, 
+				compat_regb, compat_reg);
+	}
+	
+	/* Copy the floating point registers (same size)
+	   XXX: BE WARNED FR's are 64-BIT! */	
+	DBG(1,"setup_sigcontext32: Copying from regs to sc, "
+	      "sc->sc_fr size = %#lx, regs->fr size = %#lx\n",
+		sizeof(regs->fr), sizeof(sc->sc_fr));
+	err |= __copy_to_user(sc->sc_fr, regs->fr, sizeof(regs->fr));
+
+	compat_reg = (compat_uint_t)(regs->sar);
+	err |= __put_user(compat_reg, &sc->sc_sar);
+	DBG(2,"setup_sigcontext32: sar is %#x\n", compat_reg);
+	/* Store upper half */
+	compat_reg = (compat_uint_t)(regs->sar >> 32);
+	err |= __put_user(compat_reg, &rf->rf_sar);	
+	DBG(2,"setup_sigcontext32: upper half sar = %#x\n", compat_reg);
+	DBG(1,"setup_sigcontext32: r28 is %ld\n", regs->gr[28]);
+
+	return err;
+}