diff options
Diffstat (limited to 'arch/powerpc/net')
| -rw-r--r-- | arch/powerpc/net/bpf_jit.h | 10 | ||||
| -rw-r--r-- | arch/powerpc/net/bpf_jit_comp64.c | 36 |
2 files changed, 33 insertions, 13 deletions
diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h index d767e39d5645..72b7bb34fade 100644 --- a/arch/powerpc/net/bpf_jit.h +++ b/arch/powerpc/net/bpf_jit.h @@ -19,6 +19,8 @@ #define FUNCTION_DESCR_SIZE 0 #endif +#define CTX_NIA(ctx) ((unsigned long)ctx->idx * 4) + #define PLANT_INSTR(d, idx, instr) \ do { if (d) { (d)[idx] = instr; } idx++; } while (0) #define EMIT(instr) PLANT_INSTR(image, ctx->idx, instr) @@ -26,7 +28,7 @@ /* Long jump; (unconditional 'branch') */ #define PPC_JMP(dest) \ do { \ - long offset = (long)(dest) - (ctx->idx * 4); \ + long offset = (long)(dest) - CTX_NIA(ctx); \ if ((dest) != 0 && !is_offset_in_branch_range(offset)) { \ pr_err_ratelimited("Branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \ return -ERANGE; \ @@ -40,7 +42,7 @@ /* "cond" here covers BO:BI fields. */ #define PPC_BCC_SHORT(cond, dest) \ do { \ - long offset = (long)(dest) - (ctx->idx * 4); \ + long offset = (long)(dest) - CTX_NIA(ctx); \ if ((dest) != 0 && !is_offset_in_cond_branch_range(offset)) { \ pr_err_ratelimited("Conditional branch offset 0x%lx (@%u) out of range\n", offset, ctx->idx); \ return -ERANGE; \ @@ -92,12 +94,12 @@ * state. */ #define PPC_BCC(cond, dest) do { \ - if (is_offset_in_cond_branch_range((long)(dest) - (ctx->idx * 4))) { \ + if (is_offset_in_cond_branch_range((long)(dest) - CTX_NIA(ctx))) { \ PPC_BCC_SHORT(cond, dest); \ EMIT(PPC_RAW_NOP()); \ } else { \ /* Flip the 'T or F' bit to invert comparison */ \ - PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, (ctx->idx+2)*4); \ + PPC_BCC_SHORT(cond ^ COND_CMP_TRUE, CTX_NIA(ctx) + 2*4); \ PPC_JMP(dest); \ } } while(0) diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c index 8dd3cabaa83a..0f8048f6dad6 100644 --- a/arch/powerpc/net/bpf_jit_comp64.c +++ b/arch/powerpc/net/bpf_jit_comp64.c @@ -126,8 +126,10 @@ void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx) { int i; +#ifndef CONFIG_PPC_KERNEL_PCREL if (IS_ENABLED(CONFIG_PPC64_ELF_ABI_V2)) EMIT(PPC_RAW_LD(_R2, _R13, offsetof(struct paca_struct, kernel_toc))); +#endif /* * Initialize tail_call_cnt if we do tail calls. @@ -208,16 +210,32 @@ static int bpf_jit_emit_func_call_hlp(u32 *image, struct codegen_context *ctx, u if (WARN_ON_ONCE(!core_kernel_text(func_addr))) return -EINVAL; - reladdr = func_addr - kernel_toc_addr(); - if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) { - pr_err("eBPF: address of %ps out of range of kernel_toc.\n", (void *)func); - return -ERANGE; - } + if (IS_ENABLED(CONFIG_PPC_KERNEL_PCREL)) { + reladdr = func_addr - CTX_NIA(ctx); - EMIT(PPC_RAW_ADDIS(_R12, _R2, PPC_HA(reladdr))); - EMIT(PPC_RAW_ADDI(_R12, _R12, PPC_LO(reladdr))); - EMIT(PPC_RAW_MTCTR(_R12)); - EMIT(PPC_RAW_BCTRL()); + if (reladdr >= (long)SZ_8G || reladdr < -(long)SZ_8G) { + pr_err("eBPF: address of %ps out of range of pcrel address.\n", + (void *)func); + return -ERANGE; + } + /* pla r12,addr */ + EMIT(PPC_PREFIX_MLS | __PPC_PRFX_R(1) | IMM_H18(reladdr)); + EMIT(PPC_INST_PADDI | ___PPC_RT(_R12) | IMM_L(reladdr)); + EMIT(PPC_RAW_MTCTR(_R12)); + EMIT(PPC_RAW_BCTR()); + + } else { + reladdr = func_addr - kernel_toc_addr(); + if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) { + pr_err("eBPF: address of %ps out of range of kernel_toc.\n", (void *)func); + return -ERANGE; + } + + EMIT(PPC_RAW_ADDIS(_R12, _R2, PPC_HA(reladdr))); + EMIT(PPC_RAW_ADDI(_R12, _R12, PPC_LO(reladdr))); + EMIT(PPC_RAW_MTCTR(_R12)); + EMIT(PPC_RAW_BCTRL()); + } return 0; } |