/* * Tentatively read an 8, 16, or 32-bit value from 'addr'. * If the read succeeds, the value is written to 'rptr' and zero is returned. * Else, return EFAULT. */ int badaddr_read(void *addr, size_t size, void *rptr) { extern int badaddr_read_1(const uint8_t *, uint8_t *); extern int badaddr_read_2(const uint16_t *, uint16_t *); extern int badaddr_read_4(const uint32_t *, uint32_t *); union { uint8_t v1; uint16_t v2; uint32_t v4; } u; int rv, s; cpu_drain_writebuf(); s = splhigh(); /* Read from the test address. */ switch (size) { case sizeof(uint8_t): rv = badaddr_read_1(addr, &u.v1); if (rv == 0 && rptr) *(uint8_t *) rptr = u.v1; break; case sizeof(uint16_t): rv = badaddr_read_2(addr, &u.v2); if (rv == 0 && rptr) *(uint16_t *) rptr = u.v2; break; case sizeof(uint32_t): rv = badaddr_read_4(addr, &u.v4); if (rv == 0 && rptr) *(uint32_t *) rptr = u.v4; break; default: panic("%s: invalid size (%zu)", __func__, size); } splx(s); /* Return EFAULT if the address was invalid, else zero */ return (rv); }
/* * Tentatively read an 8, 16, or 32-bit value from 'addr'. * If the read succeeds, the value is written to 'rptr' and zero is returned. * Else, return EFAULT. */ int badaddr_read(void *addr, size_t size, void *rptr) { union { uint8_t v1; uint16_t v2; uint32_t v4; } u; int rv; cpu_drain_writebuf(); /* Read from the test address. */ switch (size) { case sizeof(uint8_t): rv = badaddr_read_1(addr, &u.v1); if (rv == 0 && rptr) *(uint8_t *) rptr = u.v1; break; case sizeof(uint16_t): rv = badaddr_read_2(addr, &u.v2); if (rv == 0 && rptr) *(uint16_t *) rptr = u.v2; break; case sizeof(uint32_t): rv = badaddr_read_4(addr, &u.v4); if (rv == 0 && rptr) *(uint32_t *) rptr = u.v4; break; default: panic("badaddr: invalid size (%lu)", (u_long) size); } /* Return EFAULT if the address was invalid, else zero */ return (rv); }