- recognize relocation emitted by llvm - since all regular function will be kept in .text section and llvm takes care of pc-relative offsets in bpf_call instruction simply copy all of .text to relevant program section while adjusting bpf_call instructions in program section to point to newly copied body of instructions from .text - do so for all programs in the elf file - set all programs types to the one passed to bpf_prog_load() Note for elf files with multiple programs that use different functions in .text section we need to do 'linker' style logic. This work is still TBD
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| @@ -197,8 +197,14 @@ enum bpf_attach_type { · 196 unmodified lines | ||
| 197 | 197 | */ |
| 198 | 198 | #define BPF_F_STRICT_ALIGNMENT (1U << 0) |
| 199 | 199 | |
| 200 | +/* when bpf_ldimm64->src_reg == BPF_PSEUDO_MAP_FD, bpf_ldimm64->imm == fd */ | |
| 200 | 201 | #define BPF_PSEUDO_MAP_FD 1 |
| 201 | 202 | |
| 203 | +/* when bpf_call->src_reg == BPF_PSEUDO_CALL, bpf_call->imm == pc-relative | |
| 204 | + * offset to another bpf function | |
| 205 | + */ | |
| 206 | +#define BPF_PSEUDO_CALL 1 | |
| 207 | + | |
| 202 | 208 | /* flags for BPF_MAP_UPDATE_ELEM command */ |
| 203 | 209 | #define BPF_ANY 0 /* create new element or update existing */ |
| 204 | 210 | #define BPF_NOEXIST 1 /* create new element if it didn't exist */ |