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LoongArch fixes for v6.7-rc5

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Merge tag 'loongarch-fixes-6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson

Pull LoongArch fixes from Huacai Chen:
 "Preserve syscall nr across execve(), slightly clean up drdtime(), fix
  the Clang built zboot kernel, fix a stack unwinder bug and several bpf
  jit bugs"

* tag 'loongarch-fixes-6.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson:
  LoongArch: BPF: Fix unconditional bswap instructions
  LoongArch: BPF: Fix sign-extension mov instructions
  LoongArch: BPF: Don't sign extend function return value
  LoongArch: BPF: Don't sign extend memory load operand
  LoongArch: Preserve syscall nr across execve()
  LoongArch: Set unwind stack type to unknown rather than set error flag
  LoongArch: Slightly clean up drdtime()
  LoongArch: Apply dynamic relocations for LLD
This commit is contained in:
Linus Torvalds 2023-12-09 12:25:56 -08:00
commit b10a3ccaf6
7 changed files with 12 additions and 20 deletions
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2
arch/loongarch/Makefile
View File

@ -83,7 +83,7 @@ endif
ifeq ($(CONFIG_RELOCATABLE),y)
KBUILD_CFLAGS_KERNEL += -fPIE
LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext
LDFLAGS_vmlinux += -static -pie --no-dynamic-linker -z notext $(call ld-option, --apply-dynamic-relocs)
endif
cflags-y += $(call cc-option, -mno-check-zero-division)

2
arch/loongarch/include/asm/elf.h
View File

@ -293,7 +293,7 @@ extern const char *__elf_platform;
#define ELF_PLAT_INIT(_r, load_addr) do { \
_r->regs[1] = _r->regs[2] = _r->regs[3] = _r->regs[4] = 0; \
_r->regs[5] = _r->regs[6] = _r->regs[7] = _r->regs[8] = 0; \
_r->regs[9] = _r->regs[10] = _r->regs[11] = _r->regs[12] = 0; \
_r->regs[9] = _r->regs[10] /* syscall n */ = _r->regs[12] = 0; \
_r->regs[13] = _r->regs[14] = _r->regs[15] = _r->regs[16] = 0; \
_r->regs[17] = _r->regs[18] = _r->regs[19] = _r->regs[20] = 0; \
_r->regs[21] = _r->regs[22] = _r->regs[23] = _r->regs[24] = 0; \

5
arch/loongarch/include/asm/loongarch.h
View File

@ -1098,12 +1098,11 @@
static __always_inline u64 drdtime(void)
{
int rID = 0;
u64 val = 0;
__asm__ __volatile__(
"rdtime.d %0, %1 \n\t"
: "=r"(val), "=r"(rID)
"rdtime.d %0, $zero\n\t"
: "=r"(val)
:
);
return val;

2
arch/loongarch/kernel/stacktrace.c
View File

@ -32,7 +32,7 @@ void arch_stack_walk(stack_trace_consume_fn consume_entry, void *cookie,
}
for (unwind_start(&state, task, regs);
!unwind_done(&state) && !unwind_error(&state); unwind_next_frame(&state)) {
!unwind_done(&state); unwind_next_frame(&state)) {
addr = unwind_get_return_address(&state);
if (!addr || !consume_entry(cookie, addr))
break;

1
arch/loongarch/kernel/unwind.c
View File

@ -28,6 +28,5 @@ bool default_next_frame(struct unwind_state *state)
} while (!get_stack_info(state->sp, state->task, info));
state->error = true;
return false;
}

2
arch/loongarch/kernel/unwind_prologue.c
View File

@ -227,7 +227,7 @@ static bool next_frame(struct unwind_state *state)
} while (!get_stack_info(state->sp, state->task, info));
out:
state->error = true;
state->stack_info.type = STACK_TYPE_UNKNOWN;
return false;
}

18
arch/loongarch/net/bpf_jit.c
View File

@ -480,10 +480,12 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
case 8:
move_reg(ctx, t1, src);
emit_insn(ctx, extwb, dst, t1);
emit_zext_32(ctx, dst, is32);
break;
case 16:
move_reg(ctx, t1, src);
emit_insn(ctx, extwh, dst, t1);
emit_zext_32(ctx, dst, is32);
break;
case 32:
emit_insn(ctx, addw, dst, src, LOONGARCH_GPR_ZERO);
@ -772,8 +774,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
break;
case 32:
emit_insn(ctx, revb2w, dst, dst);
/* zero-extend 32 bits into 64 bits */
emit_zext_32(ctx, dst, is32);
/* clear the upper 32 bits */
emit_zext_32(ctx, dst, true);
break;
case 64:
emit_insn(ctx, revbd, dst, dst);
@ -911,8 +913,6 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
/* function return */
case BPF_JMP | BPF_EXIT:
emit_sext_32(ctx, regmap[BPF_REG_0], true);
if (i == ctx->prog->len - 1)
break;
@ -988,14 +988,8 @@ static int build_insn(const struct bpf_insn *insn, struct jit_ctx *ctx, bool ext
}
break;
case BPF_DW:
if (is_signed_imm12(off)) {
emit_insn(ctx, ldd, dst, src, off);
} else if (is_signed_imm14(off)) {
emit_insn(ctx, ldptrd, dst, src, off);
} else {
move_imm(ctx, t1, off, is32);
emit_insn(ctx, ldxd, dst, src, t1);
}
move_imm(ctx, t1, off, is32);
emit_insn(ctx, ldxd, dst, src, t1);
break;
}