/*
* Copyright (c) 2012, Chris Andrews. All rights reserved.
*/
#include "usdt_internal.h"
#ifdef __APPLE__
uint32_t
usdt_probe_offset(usdt_probe_t *probe, char *dof, uint8_t argc)
{
uint32_t offset;
#ifdef __x86_64__
offset = ((uint64_t) probe->probe_addr - (uint64_t) dof + 2);
#elif __i386__
offset = ((uint32_t) probe->probe_addr - (uint32_t) dof + 2);
#else
#error "only x86_64 and i386 supported"
#endif
return (offset);
}
uint32_t
usdt_is_enabled_offset(usdt_probe_t *probe, char *dof)
{
uint32_t offset;
#ifdef __x86_64__
offset = ((uint64_t) probe->isenabled_addr - (uint64_t) dof + 6);
#elif __i386__
offset = ((uint32_t) probe->isenabled_addr - (uint32_t) dof + 6);
#else
#error "only x86_64 and i386 supported"
#endif
return (offset);
}
#else /* solaris and freebsd */
uint32_t
usdt_probe_offset(usdt_probe_t *probe, char *dof, uint8_t argc)
{
return (16);
}
uint32_t
usdt_is_enabled_offset(usdt_probe_t *probe, char *dof)
{
return (8);
}
#endif
int
usdt_create_tracepoints(usdt_probe_t *probe)
{
size_t size;
/* ensure that the tracepoints will fit the heap we're allocating */
size = ((char *)usdt_tracepoint_end - (char *)usdt_tracepoint_isenabled);
assert(size < FUNC_SIZE);
if ((probe->isenabled_addr = (int (*)())valloc(FUNC_SIZE)) == NULL)
return (-1);
size = ((char *)usdt_tracepoint_probe - (char *)usdt_tracepoint_isenabled);
probe->probe_addr = (char *)probe->isenabled_addr + size;
memcpy((void *)probe->isenabled_addr,
(const void *)usdt_tracepoint_isenabled, FUNC_SIZE);
mprotect((void *)probe->isenabled_addr, FUNC_SIZE,
PROT_READ | PROT_WRITE | PROT_EXEC);
return (0);
}