On Fri, Jun 21, 2024 at 02:01:50PM +0200, Oleg Nesterov wrote: > On 06/20, Andrii Nakryiko wrote: > > > > On Thu, Jun 20, 2024 at 12:40 PM Oleg Nesterov <oleg@xxxxxxxxxx> wrote: > > > > > > But I can't understand what does it do, it calls emit_break() and > > > git grep -w emit_break finds nothing. > > > > > > > It's DEF_EMIT_REG0I15_FORMAT(break, break_op) in > > arch/loongarch/include/asm/inst.h > > > > A bunch of macro magic, but in the end it produces some constant > > value, of course. > > I see, thanks! > > Then perhaps something like below? lgtm, added loong arch list/folks for context: https://lore.kernel.org/bpf/20240614174822.GA1185149@thelio-3990X/ thanks, jirka > > Oleg. > > > --- x/arch/loongarch/include/asm/uprobes.h > +++ x/arch/loongarch/include/asm/uprobes.h > @@ -9,7 +9,7 @@ typedef u32 uprobe_opcode_t; > #define MAX_UINSN_BYTES 8 > #define UPROBE_XOL_SLOT_BYTES MAX_UINSN_BYTES > > -#define UPROBE_SWBP_INSN larch_insn_gen_break(BRK_UPROBE_BP) > +#define UPROBE_SWBP_INSN (uprobe_opcode_t)(BRK_UPROBE_BP | (break_op << 15)) > #define UPROBE_SWBP_INSN_SIZE LOONGARCH_INSN_SIZE > > #define UPROBE_XOLBP_INSN larch_insn_gen_break(BRK_UPROBE_XOLBP) > --- x/arch/loongarch/kernel/uprobes.c > +++ x/arch/loongarch/kernel/uprobes.c > @@ -7,6 +7,13 @@ > > #define UPROBE_TRAP_NR UINT_MAX > > +static __init int __ck_insn(void) > +{ > + BUG_ON(UPROBE_SWBP_INSN != larch_insn_gen_break(BRK_UPROBE_BP)); > + return 0; > +} > +late_initcall(__ck_insn); > + > int arch_uprobe_analyze_insn(struct arch_uprobe *auprobe, > struct mm_struct *mm, unsigned long addr) > { >
