5 Commits

Author	SHA1	Message	Date
Yonghong Song	be9c00347f	bpf: add " ll" in the LD_IMM64 asmstring ... This partially revert previous fix in commit f5858045aa0b ("bpf: proper print imm64 expression in inst printer"). In that commit, the original suffix "ll" is removed from LD_IMM64 asmstring. In the customer print method, the "ll" suffix is printed if the rhs is an immediate. For example, "r2 = 5ll" => "r2 = 5ll", and "r3 = varll" => "r3 = var". This has an issue though for assembler. Since assembler relies on asmstring to do pattern matching, it will not be able to distiguish between "mov r2, 5" and "ld_imm64 r2, 5" since both asmstring is "r2 = 5". In such cases, the assembler uses 64bit load for all "r = <val>" asm insts. This patch adds back " ll" suffix for ld_imm64 with one additional space for "#reg = #global_var" case. Signed-off-by: Yonghong Song <yhs@fb.com> Acked-by: Alexei Starovoitov <ast@kernel.org> llvm-svn: 312978	2017-09-11 23:43:35 +00:00
Alexei Starovoitov	e4975487f5	[bpf] error when unknown bpf helper is called ... Emit error when BPF backend sees a call to a global function or to an external symbol. The kernel verifier only allows calls to predefined helpers from bpf.h which are defined in 'enum bpf_func_id'. Such calls in assembler must look like 'call [1-9]+' where number matches bpf_func_id. Signed-off-by: Alexei Starovoitov <ast@kernel.org> llvm-svn: 292204	2017-01-17 07:26:17 +00:00
Alexei Starovoitov	8f9f8210c1	convert bpf assembler to look like kernel verifier output ... since bpf instruction set was introduced people learned to read and understand kernel verifier output whereas llvm asm output stayed obscure and unknown. Convert llvm to emit assembler text similar to kernel to avoid this discrepancy Signed-off-by: Alexei Starovoitov <ast@kernel.org> llvm-svn: 287300	2016-11-18 02:32:35 +00:00
Alexei Starovoitov	8cf9a4c472	[bpf] rename triple names bpf_be -> bpfeb ... llvm-svn: 239162	2015-06-05 16:11:14 +00:00
Alexei Starovoitov	310deada10	[bpf] add big- and host- endian support ... Summary: -march=bpf -> host endian -march=bpf_le -> little endian -match=bpf_be -> big endian Test Plan: v1 was tested by IBM s390 guys and appears to be working there. It bit rots too fast here. Reviewers: chandlerc, tstellarAMD Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D10177 llvm-svn: 239071	2015-06-04 19:15:05 +00:00