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Hengqi Chen 64f50f6575 LoongArch, bpf: Use 4 instructions for function address in JIT 
This patch fixes the following issue of function calls in JIT, like:

  [   29.346981] multi-func JIT bug 105 != 103

The issus can be reproduced by running the "inline simple bpf_loop call"
verifier test.

This is because we are emiting 2-4 instructions for 64-bit immediate moves.
During the first pass of JIT, the placeholder address is zero, emiting two
instructions for it. In the extra pass, the function address is in XKVRANGE,
emiting four instructions for it. This change the instruction index in
JIT context. Let's always use 4 instructions for function address in JIT.
So that the instruction sequences don't change between the first pass and
the extra pass for function calls.

Fixes: 5dc615520c ("LoongArch: Add BPF JIT support")
Signed-off-by: Hengqi Chen <hengqi.chen@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Link: https://lore.kernel.org/bpf/20230214152633.2265699-1-hengqi.chen@gmail.com
2023-02-17 17:43:07 +01:00
..
boot loongarch: efi: enable generic EFI compressed boot 2022-09-20 09:50:31 +02:00
configs LoongArch: Update Loongson-3 default config file 2022-12-14 08:41:54 +08:00
include LoongArch: Add generic ex-handler unwind in prologue unwinder 2023-01-17 11:42:16 +08:00
kernel LoongArch: Add generic ex-handler unwind in prologue unwinder 2023-01-17 11:42:16 +08:00
lib LoongArch: Use alternative to optimize libraries 2022-12-14 08:36:11 +08:00
mm LoongArch: Add generic ex-handler unwind in prologue unwinder 2023-01-17 11:42:16 +08:00
net LoongArch, bpf: Use 4 instructions for function address in JIT 2023-02-17 17:43:07 +01:00
pci LoongArch: Add FDT booting support from efi system table 2022-12-14 08:41:53 +08:00
power LoongArch: Add hibernation (ACPI S4) support 2022-12-14 08:41:53 +08:00
vdso LoongArch: Fix build warnings in VDSO 2022-08-25 19:34:59 +08:00
Kbuild LoongArch: Add BPF JIT support 2022-10-12 16:36:20 +08:00
Kconfig LoongArch changes for v6.2 2022-12-19 08:23:27 -06:00
Kconfig.debug LoongArch: Add prologue unwinder support 2022-08-12 13:10:11 +08:00
Makefile LoongArch/ftrace: Add dynamic function tracer support 2022-12-14 08:41:53 +08:00