diff options
Diffstat (limited to 'sys/dev/kcov.c')
| -rw-r--r-- | sys/dev/kcov.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/sys/dev/kcov.c b/sys/dev/kcov.c index e21a8c40254..f322f42a7c7 100644 --- a/sys/dev/kcov.c +++ b/sys/dev/kcov.c @@ -1,4 +1,4 @@ -/* $OpenBSD: kcov.c,v 1.32 2020/09/26 12:01:57 anton Exp $ */ +/* $OpenBSD: kcov.c,v 1.33 2020/09/26 12:06:37 anton Exp $ */ /* * Copyright (c) 2018 Anton Lindqvist <anton@openbsd.org> @@ -39,6 +39,9 @@ #define KCOV_STATE_TRACE 2 #define KCOV_STATE_DYING 3 +#define KCOV_STRIDE_TRACE_PC 1 +#define KCOV_STRIDE_TRACE_CMP 4 + /* * Coverage structure. * @@ -91,7 +94,7 @@ void kr_barrier(struct kcov_remote *); struct kcov_remote *kr_lookup(int, void *); static struct kcov_dev *kd_curproc(int); -static uint64_t kd_claim(struct kcov_dev *, int); +static uint64_t kd_claim(struct kcov_dev *, int, int); static inline int inintr(void); TAILQ_HEAD(, kcov_dev) kd_list = TAILQ_HEAD_INITIALIZER(kd_list); @@ -123,7 +126,7 @@ __sanitizer_cov_trace_pc(void) if (kd == NULL) return; - if ((idx = kd_claim(kd, 1))) + if ((idx = kd_claim(kd, KCOV_STRIDE_TRACE_PC, 1))) kd->kd_buf[idx] = (uintptr_t)__builtin_return_address(0); } @@ -145,7 +148,7 @@ trace_cmp(uint64_t type, uint64_t arg1, uint64_t arg2, uintptr_t pc) if (kd == NULL) return; - if ((idx = kd_claim(kd, 4))) { + if ((idx = kd_claim(kd, KCOV_STRIDE_TRACE_CMP, 1))) { kd->kd_buf[idx] = type; kd->kd_buf[idx + 1] = arg1; kd->kd_buf[idx + 2] = arg2; @@ -522,21 +525,21 @@ kd_curproc(int mode) } /* - * Claim stride number of elements in the coverage buffer. Returns the index of - * the first claimed element. If the claim cannot be fulfilled, zero is - * returned. + * Claim stride times nmemb number of elements in the coverage buffer. Returns + * the index of the first claimed element. If the claim cannot be fulfilled, + * zero is returned. */ static uint64_t -kd_claim(struct kcov_dev *kd, int stride) +kd_claim(struct kcov_dev *kd, int stride, int nmemb) { uint64_t idx, was; idx = kd->kd_buf[0]; for (;;) { - if (idx * stride + stride > kd->kd_nmemb) + if (stride * (idx + nmemb) > kd->kd_nmemb) return (0); - was = atomic_cas_ulong(&kd->kd_buf[0], idx, idx + 1); + was = atomic_cas_ulong(&kd->kd_buf[0], idx, idx + nmemb); if (was == idx) return (idx * stride + 1); idx = was; |