diff options
| author | YiFei Zhu <zhuyifei1999@gmail.com> | 2021-04-22 05:05:57 -0500 |
|---|---|---|
| committer | David Faust <david.faust@oracle.com> | 2021-04-23 09:56:21 -0700 |
| commit | 886b6c1e8af502b69e3f318b9830b73b88215878 (patch) | |
| tree | f0c571bf02002a92edeb420d9c6d8b0724c80f95 /gcc/config | |
| parent | 0a662e103e911af935aa5c601051c135986ce3de (diff) | |
| download | gcc-886b6c1e8af502b69e3f318b9830b73b88215878.zip gcc-886b6c1e8af502b69e3f318b9830b73b88215878.tar.gz gcc-886b6c1e8af502b69e3f318b9830b73b88215878.tar.bz2 | |
bpf: allow BSS symbols to be global symbols
Prior to this, a BSS declaration such as:
int foo;
static int bar;
Generates:
.global foo
.local foo
.comm foo,4,4
.local bar
.comm bar,4,4
Creating symbols:
0000000000000000 b foo
0000000000000004 b bar
Both symbols are local. However, libbpf bpf_object__variable_offset
rquires symbols to be STB_GLOBAL & STT_OBJECT for data section lookup.
This patch makes the same declaration generate:
.global foo
.type foo, @object
.lcomm foo,4,4
.local bar
.comm bar,4,4
Creating symbols:
0000000000000000 B foo
0000000000000004 b bar
And libbpf will be okay with looking up the global symbol "foo".
2021-04-22 YiFei Zhu <zhuyifei1999@gmail.com>
gcc/
* config/bpf/bpf.h (ASM_OUTPUT_ALIGNED_BSS): Use .type and .lcomm.
Diffstat (limited to 'gcc/config')
| -rw-r--r-- | gcc/config/bpf/bpf.h | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/gcc/config/bpf/bpf.h b/gcc/config/bpf/bpf.h index 6a3907f..4c5b19e 100644 --- a/gcc/config/bpf/bpf.h +++ b/gcc/config/bpf/bpf.h @@ -422,9 +422,15 @@ enum reg_class Try to use asm_output_aligned_bss to implement this macro. */ #define ASM_OUTPUT_ALIGNED_BSS(FILE, DECL, NAME, SIZE, ALIGN) \ - do { \ - ASM_OUTPUT_ALIGNED_LOCAL (FILE, NAME, SIZE, ALIGN); \ - } while (0) + do \ + { \ + ASM_OUTPUT_TYPE_DIRECTIVE (FILE, NAME, "object"); \ + fprintf ((FILE), "%s", "\t.lcomm\t"); \ + assemble_name ((FILE), (NAME)); \ + fprintf ((FILE), "," HOST_WIDE_INT_PRINT_UNSIGNED ",%u\n", \ + (SIZE), (ALIGN) / BITS_PER_UNIT); \ + } \ + while (0) /*** Output and Generation of Labels. */ |