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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/highmem.h>
#include <linux/ptrace.h>
#include <linux/sched.h>
#include <linux/uprobes.h>
#include <asm/cacheflush.h>
#define UPROBE_TRAP_NR UINT_MAX
int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe,
struct mm_struct *mm, unsigned long addr)
{
int idx;
union loongarch_instruction insn;
if (addr & 0x3)
return -EILSEQ;
for (idx = ARRAY_SIZE(auprobe->insn) - 1; idx >= 0; idx--) {
insn.word = auprobe->insn[idx];
if (insns_not_supported(insn))
return -EINVAL;
}
if (insns_need_simulation(insn)) {
auprobe->ixol[0] = larch_insn_gen_nop();
auprobe->simulate = true;
} else {
auprobe->ixol[0] = auprobe->insn[0];
auprobe->simulate = false;
}
auprobe->ixol[1] = UPROBE_XOLBP_INSN;
return 0;
}
int arch_uprobe_pre_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
utask->autask.saved_trap_nr = current->thread.trap_nr;
current->thread.trap_nr = UPROBE_TRAP_NR;
instruction_pointer_set(regs, utask->xol_vaddr);
user_enable_single_step(current);
return 0;
}
int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
WARN_ON_ONCE(current->thread.trap_nr != UPROBE_TRAP_NR);
current->thread.trap_nr = utask->autask.saved_trap_nr;
if (auprobe->simulate)
instruction_pointer_set(regs, auprobe->resume_era);
else
instruction_pointer_set(regs, utask->vaddr + LOONGARCH_INSN_SIZE);
user_disable_single_step(current);
return 0;
}
void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
struct uprobe_task *utask = current->utask;
current->thread.trap_nr = utask->autask.saved_trap_nr;
instruction_pointer_set(regs, utask->vaddr);
user_disable_single_step(current);
}
bool arch_uprobe_xol_was_trapped(struct task_struct *t)
{
if (t->thread.trap_nr != UPROBE_TRAP_NR)
return true;
return false;
}
bool arch_uprobe_skip_sstep(struct arch_uprobe *auprobe, struct pt_regs *regs)
{
union loongarch_instruction insn;
if (!auprobe->simulate)
return false;
insn.word = auprobe->insn[0];
arch_simulate_insn(insn, regs);
auprobe->resume_era = regs->csr_era;
return true;
}
unsigned long arch_uretprobe_hijack_return_addr(unsigned long trampoline_vaddr,
struct pt_regs *regs)
{
unsigned long ra = regs->regs[1];
regs->regs[1] = trampoline_vaddr;
return ra;
}
bool arch_uretprobe_is_alive(struct return_instance *ret,
enum rp_check ctx, struct pt_regs *regs)
{
if (ctx == RP_CHECK_CHAIN_CALL)
return regs->regs[3] <= ret->stack;
else
return regs->regs[3] < ret->stack;
}
int arch_uprobe_exception_notify(struct notifier_block *self,
unsigned long val, void *data)
{
return NOTIFY_DONE;
}
bool uprobe_breakpoint_handler(struct pt_regs *regs)
{
if (uprobe_pre_sstep_notifier(regs))
return true;
return false;
}
bool uprobe_singlestep_handler(struct pt_regs *regs)
{
if (uprobe_post_sstep_notifier(regs))
return true;
return false;
}
unsigned long uprobe_get_swbp_addr(struct pt_regs *regs)
{
return instruction_pointer(regs);
}
void arch_uprobe_copy_ixol(struct page *page, unsigned long vaddr,
void *src, unsigned long len)
{
void *kaddr = kmap_local_page(page);
void *dst = kaddr + (vaddr & ~PAGE_MASK);
memcpy(dst, src, len);
flush_icache_range((unsigned long)dst, (unsigned long)dst + len);
kunmap_local(kaddr);
}
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