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authorNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>2022-01-06 17:15:07 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2022-01-15 12:21:24 +1100
commitf9320c49993ca3c0ec0f9a7026b313735306bb8b (patch)
tree9a18b0ccc97aeb9cc228f3bbd189940d57aa4eda /arch/powerpc/net/bpf_jit_comp64.c
parentpowerpc32/bpf: Fix codegen for bpf-to-bpf calls (diff)
downloadlinux-dev-f9320c49993ca3c0ec0f9a7026b313735306bb8b.tar.xz
linux-dev-f9320c49993ca3c0ec0f9a7026b313735306bb8b.zip
powerpc/bpf: Update ldimm64 instructions during extra pass
These instructions are updated after the initial JIT, so redo codegen during the extra pass. Rename bpf_jit_fixup_subprog_calls() to clarify that this is more than just subprog calls. Fixes: 69c087ba6225b5 ("bpf: Add bpf_for_each_map_elem() helper") Cc: stable@vger.kernel.org # v5.15 Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Tested-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/7cc162af77ba918eb3ecd26ec9e7824bc44b1fae.1641468127.git.naveen.n.rao@linux.vnet.ibm.com
Diffstat (limited to 'arch/powerpc/net/bpf_jit_comp64.c')
-rw-r--r--arch/powerpc/net/bpf_jit_comp64.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c
index 9eae8d8ed340..bfdd417c6b81 100644
--- a/arch/powerpc/net/bpf_jit_comp64.c
+++ b/arch/powerpc/net/bpf_jit_comp64.c
@@ -319,6 +319,7 @@ int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, struct codegen_context *
u64 imm64;
u32 true_cond;
u32 tmp_idx;
+ int j;
/*
* addrs[] maps a BPF bytecode address into a real offset from
@@ -848,9 +849,13 @@ emit_clear:
case BPF_LD | BPF_IMM | BPF_DW: /* dst = (u64) imm */
imm64 = ((u64)(u32) insn[i].imm) |
(((u64)(u32) insn[i+1].imm) << 32);
+ tmp_idx = ctx->idx;
+ PPC_LI64(dst_reg, imm64);
+ /* padding to allow full 5 instructions for later patching */
+ for (j = ctx->idx - tmp_idx; j < 5; j++)
+ EMIT(PPC_RAW_NOP());
/* Adjust for two bpf instructions */
addrs[++i] = ctx->idx * 4;
- PPC_LI64(dst_reg, imm64);
break;
/*