Initial commit: OpenHarmony-v4.0-ReleaseOpenHarmony-v4.0-Release

1 files changed, 262 insertions, 0 deletions

diff --git a/arch/mips/kernel/uprobes.c b/arch/mips/kernel/uprobes.c
new file mode 100644
index 000000000..6dbe4eab0
--- /dev/null
+++ b/arch/mips/kernel/uprobes.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/highmem.h>
+#include <linux/kdebug.h>
+#include <linux/types.h>
+#include <linux/notifier.h>
+#include <linux/sched.h>
+#include <linux/uprobes.h>
+
+#include <asm/branch.h>
+#include <asm/cpu-features.h>
+#include <asm/ptrace.h>
+
+#include "probes-common.h"
+
+static inline int insn_has_delay_slot(const union mips_instruction insn)
+{
+        return __insn_has_delay_slot(insn);
+}
+
+/**
+ * arch_uprobe_analyze_insn - instruction analysis including validity and fixups.
+ * @mm: the probed address space.
+ * @arch_uprobe: the probepoint information.
+ * @addr: virtual address at which to install the probepoint
+ * Return 0 on success or a -ve number on error.
+ */
+int arch_uprobe_analyze_insn(struct arch_uprobe *aup,
+        struct mm_struct *mm, unsigned long addr)
+{
+        union mips_instruction inst;
+
+        /*
+         * For the time being this also blocks attempts to use uprobes with
+         * MIPS16 and microMIPS.
+         */
+        if (addr & 0x03)
+                return -EINVAL;
+
+        inst.word = aup->insn[0];
+
+        if (__insn_is_compact_branch(inst)) {
+                pr_notice("Uprobes for compact branches are not supported\n");
+                return -EINVAL;
+        }
+
+        aup->ixol[0] = aup->insn[insn_has_delay_slot(inst)];
+        aup->ixol[1] = UPROBE_BRK_UPROBE_XOL;           /* NOP  */
+
+        return 0;
+}
+
+/**
+ * is_trap_insn - check if the instruction is a trap variant
+ * @insn: instruction to be checked.
+ * Returns true if @insn is a trap variant.
+ *
+ * This definition overrides the weak definition in kernel/events/uprobes.c.
+ * and is needed for the case where an architecture has multiple trap
+ * instructions (like PowerPC or MIPS).  We treat BREAK just like the more
+ * modern conditional trap instructions.
+ */
+bool is_trap_insn(uprobe_opcode_t *insn)
+{
+        union mips_instruction inst;
+
+        inst.word = *insn;
+
+        switch (inst.i_format.opcode) {
+        case spec_op:
+                switch (inst.r_format.func) {
+                case break_op:
+                case teq_op:
+                case tge_op:
+                case tgeu_op:
+                case tlt_op:
+                case tltu_op:
+                case tne_op:
+                        return 1;
+                }
+                break;
+
+        case bcond_op:  /* Yes, really ...  */
+                switch (inst.u_format.rt) {
+                case teqi_op:
+                case tgei_op:
+                case tgeiu_op:
+                case tlti_op:
+                case tltiu_op:
+                case tnei_op:
+                        return 1;
+                }
+                break;
+        }
+
+        return 0;
+}
+
+#define UPROBE_TRAP_NR  ULONG_MAX
+
+/*
+ * arch_uprobe_pre_xol - prepare to execute out of line.
+ * @auprobe: the probepoint information.
+ * @regs: reflects the saved user state of current task.
+ */
+int arch_uprobe_pre_xol(struct arch_uprobe *aup, struct pt_regs *regs)
+{
+        struct uprobe_task *utask = current->utask;
+
+        /*
+         * Now find the EPC where to resume after the breakpoint has been
+         * dealt with.  This may require emulation of a branch.
+         */
+        aup->resume_epc = regs->cp0_epc + 4;
+        if (insn_has_delay_slot((union mips_instruction) aup->insn[0])) {
+                __compute_return_epc_for_insn(regs,
+                        (union mips_instruction) aup->insn[0]);
+                aup->resume_epc = regs->cp0_epc;
+        }
+        utask->autask.saved_trap_nr = current->thread.trap_nr;
+        current->thread.trap_nr = UPROBE_TRAP_NR;
+        regs->cp0_epc = current->utask->xol_vaddr;
+
+        return 0;
+}
+
+int arch_uprobe_post_xol(struct arch_uprobe *aup, struct pt_regs *regs)
+{
+        struct uprobe_task *utask = current->utask;
+
+        current->thread.trap_nr = utask->autask.saved_trap_nr;
+        regs->cp0_epc = aup->resume_epc;
+
+        return 0;
+}
+
+/*
+ * If xol insn itself traps and generates a signal(Say,
+ * SIGILL/SIGSEGV/etc), then detect the case where a singlestepped
+ * instruction jumps back to its own address. It is assumed that anything
+ * like do_page_fault/do_trap/etc sets thread.trap_nr != -1.
+ *
+ * arch_uprobe_pre_xol/arch_uprobe_post_xol save/restore thread.trap_nr,
+ * arch_uprobe_xol_was_trapped() simply checks that ->trap_nr is not equal to
+ * UPROBE_TRAP_NR == -1 set by arch_uprobe_pre_xol().
+ */
+bool arch_uprobe_xol_was_trapped(struct task_struct *tsk)
+{
+        if (tsk->thread.trap_nr != UPROBE_TRAP_NR)
+                return true;
+
+        return false;
+}
+
+int arch_uprobe_exception_notify(struct notifier_block *self,
+        unsigned long val, void *data)
+{
+        struct die_args *args = data;
+        struct pt_regs *regs = args->regs;
+
+        /* regs == NULL is a kernel bug */
+        if (WARN_ON(!regs))
+                return NOTIFY_DONE;
+
+        /* We are only interested in userspace traps */
+        if (!user_mode(regs))
+                return NOTIFY_DONE;
+
+        switch (val) {
+        case DIE_UPROBE:
+                if (uprobe_pre_sstep_notifier(regs))
+                        return NOTIFY_STOP;
+                break;
+        case DIE_UPROBE_XOL:
+                if (uprobe_post_sstep_notifier(regs))
+                        return NOTIFY_STOP;
+        default:
+                break;
+        }
+
+        return 0;
+}
+
+/*
+ * This function gets called when XOL instruction either gets trapped or
+ * the thread has a fatal signal. Reset the instruction pointer to its
+ * probed address for the potential restart or for post mortem analysis.
+ */
+void arch_uprobe_abort_xol(struct arch_uprobe *aup,
+        struct pt_regs *regs)
+{
+        struct uprobe_task *utask = current->utask;
+
+        instruction_pointer_set(regs, utask->vaddr);
+}
+
+unsigned long arch_uretprobe_hijack_return_addr(
+        unsigned long trampoline_vaddr, struct pt_regs *regs)
+{
+        unsigned long ra;
+
+        ra = regs->regs[31];
+
+        /* Replace the return address with the trampoline address */
+        regs->regs[31] = trampoline_vaddr;
+
+        return ra;
+}
+
+/**
+ * set_swbp - store breakpoint at a given address.
+ * @auprobe: arch specific probepoint information.
+ * @mm: the probed process address space.
+ * @vaddr: the virtual address to insert the opcode.
+ *
+ * For mm @mm, store the breakpoint instruction at @vaddr.
+ * Return 0 (success) or a negative errno.
+ *
+ * This version overrides the weak version in kernel/events/uprobes.c.
+ * It is required to handle MIPS16 and microMIPS.
+ */
+int __weak set_swbp(struct arch_uprobe *auprobe, struct mm_struct *mm,
+        unsigned long vaddr)
+{
+        return uprobe_write_opcode(auprobe, mm, vaddr, UPROBE_SWBP_INSN);
+}
+
+void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
+                                  void *src, unsigned long len)
+{
+        unsigned long kaddr, kstart;
+
+        /* Initialize the slot */
+        kaddr = (unsigned long)kmap_atomic(page);
+        kstart = kaddr + (vaddr & ~PAGE_MASK);
+        memcpy((void *)kstart, src, len);
+        flush_icache_range(kstart, kstart + len);
+        kunmap_atomic((void *)kaddr);
+}
+
+/**
+ * uprobe_get_swbp_addr - compute address of swbp given post-swbp regs
+ * @regs: Reflects the saved state of the task after it has hit a breakpoint
+ * instruction.
+ * Return the address of the breakpoint instruction.
+ *
+ * This overrides the weak version in kernel/events/uprobes.c.
+ */
+unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
+{
+        return instruction_pointer(regs);
+}
+
+/*
+ * See if the instruction can be emulated.
+ * Returns true if instruction was emulated, false otherwise.
+ *
+ * For now we always emulate so this function just returns 0.
+ */
+bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
+{
+        return 0;
+}