[PATCH 6/7] bpf testsuite: Add BPF CO-RE tests

Jose E. Marchesi jose.marchesi@oracle.com
Tue Aug 10 15:12:26 GMT 2021


Hi David.
This BPF part is OK.

> This commit adds several tests for the new BPF CO-RE functionality to
> the BPF target testsuite.
>
> gcc/testsuite/ChangeLog:
>
> 	* gcc.target/bpf/core-attr-1.c: New test.
> 	* gcc.target/bpf/core-attr-2.c: Likewise.
> 	* gcc.target/bpf/core-attr-3.c: Likewise.
> 	* gcc.target/bpf/core-attr-4.c: Likewise
> 	* gcc.target/bpf/core-builtin-1.c: Likewise
> 	* gcc.target/bpf/core-builtin-2.c: Likewise.
> 	* gcc.target/bpf/core-builtin-3.c: Likewise.
> 	* gcc.target/bpf/core-section-1.c: Likewise.
> ---
>  gcc/testsuite/gcc.target/bpf/core-attr-1.c    | 23 +++++++
>  gcc/testsuite/gcc.target/bpf/core-attr-2.c    | 21 ++++++
>  gcc/testsuite/gcc.target/bpf/core-attr-3.c    | 41 ++++++++++++
>  gcc/testsuite/gcc.target/bpf/core-attr-4.c    | 35 ++++++++++
>  gcc/testsuite/gcc.target/bpf/core-builtin-1.c | 64 +++++++++++++++++++
>  gcc/testsuite/gcc.target/bpf/core-builtin-2.c | 26 ++++++++
>  gcc/testsuite/gcc.target/bpf/core-builtin-3.c | 26 ++++++++
>  gcc/testsuite/gcc.target/bpf/core-section-1.c | 38 +++++++++++
>  8 files changed, 274 insertions(+)
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-attr-1.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-attr-2.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-attr-3.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-attr-4.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-builtin-1.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-builtin-2.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-builtin-3.c
>  create mode 100644 gcc/testsuite/gcc.target/bpf/core-section-1.c
>
> diff --git a/gcc/testsuite/gcc.target/bpf/core-attr-1.c b/gcc/testsuite/gcc.target/bpf/core-attr-1.c
> new file mode 100644
> index 00000000000..7f0d0e50dd6
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-attr-1.c
> @@ -0,0 +1,23 @@
> +/* Basic test for struct __attribute__((preserve_access_index))
> +   for BPF CO-RE support.  */
> +
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct S {
> +  int a;
> +  int b;
> +  int c;
> +} __attribute__((preserve_access_index));
> +
> +void
> +func (struct S * s)
> +{
> +  /* 0:2 */
> +  int *x = &(s->c);
> +
> +  *x = 4;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:2.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 1 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-attr-2.c b/gcc/testsuite/gcc.target/bpf/core-attr-2.c
> new file mode 100644
> index 00000000000..508e1e4c4b1
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-attr-2.c
> @@ -0,0 +1,21 @@
> +/* Basic test for union __attribute__((preserve_access_index))
> +   for BPF CO-RE support.  */
> +
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +union U {
> +  int a;
> +  char c;
> +} __attribute__((preserve_access_index));
> +
> +void
> +func (union U *u)
> +{
> +  /* 0:1 */
> +  char *c = &(u->c);
> +  *c = 'c';
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:1.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 1 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-attr-3.c b/gcc/testsuite/gcc.target/bpf/core-attr-3.c
> new file mode 100644
> index 00000000000..1813fd07a2f
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-attr-3.c
> @@ -0,0 +1,41 @@
> +/* Test for __attribute__((preserve_access_index)) for BPF CO-RE support
> +   for nested structure.
> +
> +   Note that even though struct O lacks the attribute, when accessed as a
> +   member of another attributed type, CO-RE relocations should still be
> +   generated.  */
> +
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct O {
> +  int e;
> +  int f;
> +};
> +
> +struct S {
> +  int a;
> +  struct {
> +    int b;
> +    int c;
> +  } inner;
> +  struct O other;
> +} __attribute__((preserve_access_index));
> +
> +void
> +func (struct S *foo)
> +{
> +  /* 0:1:1 */
> +  int *x = &(foo->inner.c);
> +
> +  /* 0:2:0 */
> +  int *y = &(foo->other.e);
> +
> +  *x = 4;
> +  *y = 5;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:1:1.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:2:0.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +
> +/* { dg-final { scan-assembler-times "bpfcr_type" 2 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-attr-4.c b/gcc/testsuite/gcc.target/bpf/core-attr-4.c
> new file mode 100644
> index 00000000000..30d859a1c57
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-attr-4.c
> @@ -0,0 +1,35 @@
> +/* Test for BPF CO-RE __attribute__((preserve_access_index)) with accesses on
> +   LHS and both LHS and RHS of assignment.  */
> +
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct T {
> +  int a;
> +  int b;
> +  struct U {
> +    int c;
> +    struct V {
> +      int d;
> +      int e[4];
> +      int f;
> +    } v;
> +  } u;
> +} __attribute__((preserve_access_index));
> +
> +
> +void
> +func (struct T *t)
> +{
> +  /* 0:2:1:1:3 */
> +  t->u.v.e[3] = 0xa1;
> +
> +  /* 0:2:0, 0:0, 0:1 */
> +  t->u.c = t->a + t->b;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:2:1:1:3.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:2:0.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:0.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:1.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 4 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-builtin-1.c b/gcc/testsuite/gcc.target/bpf/core-builtin-1.c
> new file mode 100644
> index 00000000000..e6905418c89
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-builtin-1.c
> @@ -0,0 +1,64 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct S {
> +  int a;
> +  int b;
> +  char c;
> +};
> +
> +union U {
> +  unsigned int u;
> +  int i;
> +  unsigned char uc[4];
> +  signed char ic[4];
> +};
> +
> +struct S my_s;
> +union U my_u;
> +
> +unsigned long ula[8];
> +
> +#define _(x) (__builtin_preserve_access_index (x))
> +
> +void
> +func (void)
> +{
> +  /* 1 */
> +  int b = _(my_s.b);
> +
> +  /* 2 */
> +  char c = _(my_s.c);
> +
> +  /* 2:3 */
> +  unsigned char uc = _(my_u.uc[3]);
> +
> +  /* 6 */
> +  unsigned long ul = _(ula[6]);
> +}
> +
> +char
> +s_ptr (struct S *ps)
> +{
> +  /* 0:2 */
> +  char x = _(ps->c);
> +  return x;
> +}
> +
> +unsigned char
> +u_ptr (union U *pu)
> +{
> +  /* 0:2:3 */
> +  unsigned char x = _(pu->uc[3]);
> +  return x;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"1.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"2.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"2:3.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"6.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:2.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:2:3.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +
> +/* { dg-final { scan-assembler-times "bpfcr_type" 6 } } */
> +/* { dg-final { scan-assembler-times "\[\t \]0x6c\[\t \]+\[^\n\]*core_relo_len" 1 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-builtin-2.c b/gcc/testsuite/gcc.target/bpf/core-builtin-2.c
> new file mode 100644
> index 00000000000..5e9dfecce65
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-builtin-2.c
> @@ -0,0 +1,26 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct S {
> +  int a;
> +  union {
> +    int _unused;
> +    int b;
> +    char c;
> +  } u[4];
> +};
> +
> +struct S foo;
> +
> +#define _(x) (__builtin_preserve_access_index (x))
> +
> +void func (void)
> +{
> +  char *x = __builtin_preserve_access_index (&foo.u[3].c);
> +
> +  *x = 's';
> +}
> +
> +/* { dg-final { scan-assembler-times "\[\t \]0x4000002\[\t \]+\[^\n\]*btt_info" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"1:3:2.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 1 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-builtin-3.c b/gcc/testsuite/gcc.target/bpf/core-builtin-3.c
> new file mode 100644
> index 00000000000..495eeadfe69
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-builtin-3.c
> @@ -0,0 +1,26 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -dA -gbtf -mcore" } */
> +
> +struct T {
> +  int a;
> +  int b;
> +  struct U {
> +    int c;
> +    struct V {
> +      int d;
> +      int e[4];
> +      int f;
> +    } v;
> +  } u;
> +};
> +
> +void func (struct T * foo)
> +{
> +  /* Access string: "0:2:1:1:3" */
> +  int *x = __builtin_preserve_access_index (&(foo->u.v.e[3]));
> +
> +  *x = 17;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:2:1:1:3.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 1 } } */
> diff --git a/gcc/testsuite/gcc.target/bpf/core-section-1.c b/gcc/testsuite/gcc.target/bpf/core-section-1.c
> new file mode 100644
> index 00000000000..b816aefd0d2
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/bpf/core-section-1.c
> @@ -0,0 +1,38 @@
> +/* { dg-do compile } */
> +/* { dg-options "-O0 -gbtf -dA -mcore" } */
> +
> +struct T {
> +  int a;
> +  int b;
> +  struct U {
> +    int c;
> +    struct V {
> +      int d;
> +      int e[4];
> +      int f;
> +    } v;
> +  } u;
> +};
> +
> +__attribute__((section("foo_sec"), used))
> +int foo_func (struct T *t)
> +{
> +  t->u.c = 5;
> +  return __builtin_preserve_access_index (t->u.v.e[3]);
> +}
> +
> +__attribute__((section("bar_sec"), used))
> +int bar_func (struct T *t)
> +{
> +  int *x = __builtin_preserve_access_index (&(t->u.v.f));
> +  int old = *x;
> +  *x = 4;
> +  return old;
> +}
> +
> +/* { dg-final { scan-assembler-times "ascii \"0:2:1:1:3.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"0:2:1:2.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"foo_sec.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "ascii \"bar_sec.0\"\[\t \]+\[^\n\]*btf_aux_string" 1 } } */
> +/* { dg-final { scan-assembler-times "bpfcr_type" 2 } } */
> +/* { dg-final { scan-assembler-times "btfext_secinfo_rec_size" 2 } } */


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