diff options
Diffstat (limited to 'arch/loongarch/kernel/hw_breakpoint.c')
| -rw-r--r-- | arch/loongarch/kernel/hw_breakpoint.c | 33 |
1 files changed, 29 insertions, 4 deletions
diff --git a/arch/loongarch/kernel/hw_breakpoint.c b/arch/loongarch/kernel/hw_breakpoint.c index b88efe6c672e..2406c95b34cc 100644 --- a/arch/loongarch/kernel/hw_breakpoint.c +++ b/arch/loongarch/kernel/hw_breakpoint.c @@ -153,6 +153,22 @@ void ptrace_hw_copy_thread(struct task_struct *tsk) */ void flush_ptrace_hw_breakpoint(struct task_struct *tsk) { + int i; + struct thread_struct *t = &tsk->thread; + + for (i = 0; i < LOONGARCH_MAX_BRP; i++) { + if (t->hbp_break[i]) { + unregister_hw_breakpoint(t->hbp_break[i]); + t->hbp_break[i] = NULL; + } + } + + for (i = 0; i < LOONGARCH_MAX_WRP; i++) { + if (t->hbp_watch[i]) { + unregister_hw_breakpoint(t->hbp_watch[i]); + t->hbp_watch[i] = NULL; + } + } } static int hw_breakpoint_control(struct perf_event *bp, @@ -501,12 +517,21 @@ arch_initcall(arch_hw_breakpoint_init); void hw_breakpoint_thread_switch(struct task_struct *next) { + u64 addr, mask; struct pt_regs *regs = task_pt_regs(next); - /* Update breakpoints */ - update_bp_registers(regs, 1, 0); - /* Update watchpoints */ - update_bp_registers(regs, 1, 1); + if (test_tsk_thread_flag(next, TIF_SINGLESTEP)) { + addr = read_wb_reg(CSR_CFG_ADDR, 0, 0); + mask = read_wb_reg(CSR_CFG_MASK, 0, 0); + if (!((regs->csr_era ^ addr) & ~mask)) + csr_write32(CSR_FWPC_SKIP, LOONGARCH_CSR_FWPS); + regs->csr_prmd |= CSR_PRMD_PWE; + } else { + /* Update breakpoints */ + update_bp_registers(regs, 1, 0); + /* Update watchpoints */ + update_bp_registers(regs, 1, 1); + } } void hw_breakpoint_pmu_read(struct perf_event *bp) |