Adding upstream version 4.19.249.upstream/4.19.249upstream

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

1 files changed, 311 insertions, 0 deletions

diff --git a/arch/mips/kernel/ptrace32.c b/arch/mips/kernel/ptrace32.c
new file mode 100644
index 000000000..bc348d44d
--- /dev/null
+++ b/arch/mips/kernel/ptrace32.c
@@ -0,0 +1,311 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 1992 Ross Biro
+ * Copyright (C) Linus Torvalds
+ * Copyright (C) 1994, 95, 96, 97, 98, 2000 Ralf Baechle
+ * Copyright (C) 1996 David S. Miller
+ * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
+ * Copyright (C) 1999 MIPS Technologies, Inc.
+ * Copyright (C) 2000 Ulf Carlsson
+ *
+ * At this time Linux/MIPS64 only supports syscall tracing, even for 32-bit
+ * binaries.
+ */
+#include <linux/compiler.h>
+#include <linux/compat.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/sched/task_stack.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/smp.h>
+#include <linux/security.h>
+
+#include <asm/cpu.h>
+#include <asm/dsp.h>
+#include <asm/fpu.h>
+#include <asm/mipsregs.h>
+#include <asm/mipsmtregs.h>
+#include <asm/pgtable.h>
+#include <asm/page.h>
+#include <asm/reg.h>
+#include <asm/syscall.h>
+#include <linux/uaccess.h>
+#include <asm/bootinfo.h>
+
+/*
+ * Tracing a 32-bit process with a 64-bit strace and vice versa will not
+ * work.  I don't know how to fix this.
+ */
+long compat_arch_ptrace(struct task_struct *child, compat_long_t request,
+			compat_ulong_t caddr, compat_ulong_t cdata)
+{
+	int addr = caddr;
+	int data = cdata;
+	int ret;
+
+	switch (request) {
+
+	/*
+	 * Read 4 bytes of the other process' storage
+	 *  data is a pointer specifying where the user wants the
+	 *	4 bytes copied into
+	 *  addr is a pointer in the user's storage that contains an 8 byte
+	 *	address in the other process of the 4 bytes that is to be read
+	 * (this is run in a 32-bit process looking at a 64-bit process)
+	 * when I and D space are separate, these will need to be fixed.
+	 */
+	case PTRACE_PEEKTEXT_3264:
+	case PTRACE_PEEKDATA_3264: {
+		u32 tmp;
+		int copied;
+		u32 __user * addrOthers;
+
+		ret = -EIO;
+
+		/* Get the addr in the other process that we want to read */
+		if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
+			break;
+
+		copied = ptrace_access_vm(child, (u64)addrOthers, &tmp,
+				sizeof(tmp), FOLL_FORCE);
+		if (copied != sizeof(tmp))
+			break;
+		ret = put_user(tmp, (u32 __user *) (unsigned long) data);
+		break;
+	}
+
+	/* Read the word at location addr in the USER area. */
+	case PTRACE_PEEKUSR: {
+		struct pt_regs *regs;
+		union fpureg *fregs;
+		unsigned int tmp;
+
+		regs = task_pt_regs(child);
+		ret = 0;  /* Default return value. */
+
+		switch (addr) {
+		case 0 ... 31:
+			tmp = regs->regs[addr];
+			break;
+		case FPR_BASE ... FPR_BASE + 31:
+			if (!tsk_used_math(child)) {
+				/* FP not yet used */
+				tmp = -1;
+				break;
+			}
+			fregs = get_fpu_regs(child);
+			if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
+				/*
+				 * The odd registers are actually the high
+				 * order bits of the values stored in the even
+				 * registers.
+				 */
+				tmp = get_fpr32(&fregs[(addr & ~1) - FPR_BASE],
+						addr & 1);
+				break;
+			}
+			tmp = get_fpr64(&fregs[addr - FPR_BASE], 0);
+			break;
+		case PC:
+			tmp = regs->cp0_epc;
+			break;
+		case CAUSE:
+			tmp = regs->cp0_cause;
+			break;
+		case BADVADDR:
+			tmp = regs->cp0_badvaddr;
+			break;
+		case MMHI:
+			tmp = regs->hi;
+			break;
+		case MMLO:
+			tmp = regs->lo;
+			break;
+		case FPC_CSR:
+			tmp = child->thread.fpu.fcr31;
+			break;
+		case FPC_EIR:
+			/* implementation / version register */
+			tmp = boot_cpu_data.fpu_id;
+			break;
+		case DSP_BASE ... DSP_BASE + 5: {
+			dspreg_t *dregs;
+
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out;
+			}
+			dregs = __get_dsp_regs(child);
+			tmp = dregs[addr - DSP_BASE];
+			break;
+		}
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				tmp = 0;
+				ret = -EIO;
+				goto out;
+			}
+			tmp = child->thread.dsp.dspcontrol;
+			break;
+		default:
+			tmp = 0;
+			ret = -EIO;
+			goto out;
+		}
+		ret = put_user(tmp, (unsigned __user *) (unsigned long) data);
+		break;
+	}
+
+	/*
+	 * Write 4 bytes into the other process' storage
+	 *  data is the 4 bytes that the user wants written
+	 *  addr is a pointer in the user's storage that contains an
+	 *	8 byte address in the other process where the 4 bytes
+	 *	that is to be written
+	 * (this is run in a 32-bit process looking at a 64-bit process)
+	 * when I and D space are separate, these will need to be fixed.
+	 */
+	case PTRACE_POKETEXT_3264:
+	case PTRACE_POKEDATA_3264: {
+		u32 __user * addrOthers;
+
+		/* Get the addr in the other process that we want to write into */
+		ret = -EIO;
+		if (get_user(addrOthers, (u32 __user * __user *) (unsigned long) addr) != 0)
+			break;
+		ret = 0;
+		if (ptrace_access_vm(child, (u64)addrOthers, &data,
+					sizeof(data),
+					FOLL_FORCE | FOLL_WRITE) == sizeof(data))
+			break;
+		ret = -EIO;
+		break;
+	}
+
+	case PTRACE_POKEUSR: {
+		struct pt_regs *regs;
+		ret = 0;
+		regs = task_pt_regs(child);
+
+		switch (addr) {
+		case 0 ... 31:
+			regs->regs[addr] = data;
+			/* System call number may have been changed */
+			if (addr == 2)
+				mips_syscall_update_nr(child, regs);
+			else if (addr == 4 &&
+				 mips_syscall_is_indirect(child, regs))
+				mips_syscall_update_nr(child, regs);
+			break;
+		case FPR_BASE ... FPR_BASE + 31: {
+			union fpureg *fregs = get_fpu_regs(child);
+
+			if (!tsk_used_math(child)) {
+				/* FP not yet used  */
+				memset(&child->thread.fpu, ~0,
+				       sizeof(child->thread.fpu));
+				child->thread.fpu.fcr31 = 0;
+			}
+			if (test_tsk_thread_flag(child, TIF_32BIT_FPREGS)) {
+				/*
+				 * The odd registers are actually the high
+				 * order bits of the values stored in the even
+				 * registers.
+				 */
+				set_fpr32(&fregs[(addr & ~1) - FPR_BASE],
+					  addr & 1, data);
+				break;
+			}
+			set_fpr64(&fregs[addr - FPR_BASE], 0, data);
+			break;
+		}
+		case PC:
+			regs->cp0_epc = data;
+			break;
+		case MMHI:
+			regs->hi = data;
+			break;
+		case MMLO:
+			regs->lo = data;
+			break;
+		case FPC_CSR:
+			child->thread.fpu.fcr31 = data;
+			break;
+		case DSP_BASE ... DSP_BASE + 5: {
+			dspreg_t *dregs;
+
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+
+			dregs = __get_dsp_regs(child);
+			dregs[addr - DSP_BASE] = data;
+			break;
+		}
+		case DSP_CONTROL:
+			if (!cpu_has_dsp) {
+				ret = -EIO;
+				break;
+			}
+			child->thread.dsp.dspcontrol = data;
+			break;
+		default:
+			/* The rest are not allowed. */
+			ret = -EIO;
+			break;
+		}
+		break;
+		}
+
+	case PTRACE_GETREGS:
+		ret = ptrace_getregs(child,
+				(struct user_pt_regs __user *) (__u64) data);
+		break;
+
+	case PTRACE_SETREGS:
+		ret = ptrace_setregs(child,
+				(struct user_pt_regs __user *) (__u64) data);
+		break;
+
+	case PTRACE_GETFPREGS:
+		ret = ptrace_getfpregs(child, (__u32 __user *) (__u64) data);
+		break;
+
+	case PTRACE_SETFPREGS:
+		ret = ptrace_setfpregs(child, (__u32 __user *) (__u64) data);
+		break;
+
+	case PTRACE_GET_THREAD_AREA:
+		ret = put_user(task_thread_info(child)->tp_value,
+				(unsigned int __user *) (unsigned long) data);
+		break;
+
+	case PTRACE_GET_THREAD_AREA_3264:
+		ret = put_user(task_thread_info(child)->tp_value,
+				(unsigned long __user *) (unsigned long) data);
+		break;
+
+	case PTRACE_GET_WATCH_REGS:
+		ret = ptrace_get_watch_regs(child,
+			(struct pt_watch_regs __user *) (unsigned long) addr);
+		break;
+
+	case PTRACE_SET_WATCH_REGS:
+		ret = ptrace_set_watch_regs(child,
+			(struct pt_watch_regs __user *) (unsigned long) addr);
+		break;
+
+	default:
+		ret = compat_ptrace_request(child, request, addr, data);
+		break;
+	}
+out:
+	return ret;
+}