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bpf: Disasm support for addr_space_cast instruction.
LLVM generates rX = addr_space_cast(rY, dst_addr_space, src_addr_space) instruction when pointers in non-zero address space are used by the bpf program. Recognize this insn in uapi and in bpf disassembler. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/bpf/20240308010812.89848-3-alexei.starovoitov@gmail.com
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@ -1339,6 +1339,10 @@ enum {
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*/
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#define BPF_PSEUDO_KFUNC_CALL 2
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enum bpf_addr_space_cast {
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BPF_ADDR_SPACE_CAST = 1,
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};
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/* flags for BPF_MAP_UPDATE_ELEM command */
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enum {
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BPF_ANY = 0, /* create new element or update existing */
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@ -166,6 +166,12 @@ static bool is_movsx(const struct bpf_insn *insn)
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(insn->off == 8 || insn->off == 16 || insn->off == 32);
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}
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static bool is_addr_space_cast(const struct bpf_insn *insn)
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{
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return insn->code == (BPF_ALU64 | BPF_MOV | BPF_X) &&
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insn->off == BPF_ADDR_SPACE_CAST;
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}
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void print_bpf_insn(const struct bpf_insn_cbs *cbs,
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const struct bpf_insn *insn,
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bool allow_ptr_leaks)
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@ -184,6 +190,10 @@ void print_bpf_insn(const struct bpf_insn_cbs *cbs,
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insn->code, class == BPF_ALU ? 'w' : 'r',
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insn->dst_reg, class == BPF_ALU ? 'w' : 'r',
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insn->dst_reg);
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} else if (is_addr_space_cast(insn)) {
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verbose(cbs->private_data, "(%02x) r%d = addr_space_cast(r%d, %d, %d)\n",
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insn->code, insn->dst_reg,
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insn->src_reg, ((u32)insn->imm) >> 16, (u16)insn->imm);
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} else if (BPF_SRC(insn->code) == BPF_X) {
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verbose(cbs->private_data, "(%02x) %c%d %s %s%c%d\n",
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insn->code, class == BPF_ALU ? 'w' : 'r',
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@ -1339,6 +1339,10 @@ enum {
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*/
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#define BPF_PSEUDO_KFUNC_CALL 2
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enum bpf_addr_space_cast {
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BPF_ADDR_SPACE_CAST = 1,
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};
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/* flags for BPF_MAP_UPDATE_ELEM command */
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enum {
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BPF_ANY = 0, /* create new element or update existing */
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