diff options
| author | Jose E. Marchesi <jose.marchesi@oracle.com> | 2023-07-24 01:15:08 +0200 |
|---|---|---|
| committer | Jose E. Marchesi <jose.marchesi@oracle.com> | 2023-07-24 01:20:03 +0200 |
| commit | c2ca88d74ba3618c4aac6744e923c279ca4cb7f1 (patch) | |
| tree | cdd500a8a997bd1a8f908176d8f5fe4143d0542d /gas/doc/c-bpf.texi | |
| parent | 338b21b0881e16bb7116e4eb5bc41817f805ec23 (diff) | |
| download | gdb-c2ca88d74ba3618c4aac6744e923c279ca4cb7f1.zip gdb-c2ca88d74ba3618c4aac6744e923c279ca4cb7f1.tar.gz gdb-c2ca88d74ba3618c4aac6744e923c279ca4cb7f1.tar.bz2 | |
bpf: add support for jal/gotol jump instruction with 32-bit target
This patch adds support for the V4 BPF instruction jal/gotol, which is
like ja/goto but it supports a signed 32-bit PC-relative (in number of
64-bit words minus one) target operand instead of the 16-bit signed
operand of the other instruction. This greatly increases the jump
range in BPF programs.
Tested in bpf-unkown-none.
bfd/ChangeLog:
2023-07-24 Jose E. Marchesi <jose.marchesi@oracle.com>
* reloc.c: New reloc BFD_RELOC_BPF_DISPCALL32.
* elf64-bpf.c (bpf_reloc_type_lookup): Handle the new reloc.
* libbfd.h (bfd_reloc_code_real_names): Regenerate.
gas/ChangeLog:
2023-07-24 Jose E. Marchesi <jose.marchesi@oracle.com>
* config/tc-bpf.c (struct bpf_insn): New field `id'.
(md_assemble): Save the ids of successfully parsed instructions
and use the new BFD_RELOC_BPF_DISPCALL32 whenever appropriate.
(md_apply_fix): Adapt to the new BFD reloc.
* testsuite/gas/bpf/jump.s: Test JAL.
* testsuite/gas/bpf/jump.d: Likewise.
* testsuite/gas/bpf/jump-pseudoc.d: Likewise.
* testsuite/gas/bpf/jump-be.d: Likewise.
* testsuite/gas/bpf/jump-be-pseudoc.d: Likewise.
* doc/c-bpf.texi (BPF Instructions): Document new instruction
jal/gotol.
Document new operand type disp32.
include/ChangeLog:
2023-07-24 Jose E. Marchesi <jose.marchesi@oracle.com>
* opcode/bpf.h (enum bpf_insn_id): Add entry BPF_INSN_JAL.
(enum bpf_insn_id): Remove spurious entry BPF_INSN_CALLI.
opcodes/ChangeLog:
2023-07-23 Jose E. Marchesi <jose.marchesi@oracle.com>
* bpf-opc.c (bpf_opcodes): Add entry for jal.
Diffstat (limited to 'gas/doc/c-bpf.texi')
| -rw-r--r-- | gas/doc/c-bpf.texi | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gas/doc/c-bpf.texi b/gas/doc/c-bpf.texi index bebf760..d4fd181 100644 --- a/gas/doc/c-bpf.texi +++ b/gas/doc/c-bpf.texi @@ -160,6 +160,9 @@ Signed 16-bit immediate representing an offset in bytes. @item disp16 Signed 16-bit immediate representing a displacement to a target, measured in number of 64-bit words @emph{minus one}. +@item disp32 +Signed 32-bit immediate representing a displacement to a target, +measured in number of 64-bit words @emph{minus one}. @item imm32 Signed 32-bit immediate. @item imm64 @@ -555,6 +558,10 @@ holds true. @itemx goto disp16 Jump-always. +@item jal disp32 +@itemx gotol disp32 +Jump-always, long range. + @item jeq rd, rs, disp16 @itemx jeq rd, imm32, disp16 @itemx if rd == rs goto disp16 |