--- /dev/null
+/* DTrace probe support for GDB.
+
+ Copyright (C) 2014-2015 Free Software Foundation, Inc.
+
+ Contributed by Oracle, Inc.
+
+ This file is part of GDB.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
+
+#include "defs.h"
+#include "probe.h"
+#include "vec.h"
+#include "elf-bfd.h"
+#include "gdbtypes.h"
+#include "obstack.h"
+#include "objfiles.h"
+#include "complaints.h"
+#include "value.h"
+#include "ax.h"
+#include "ax-gdb.h"
+#include "language.h"
+#include "parser-defs.h"
+#include "inferior.h"
+
+/* The type of the ELF sections where we will find the DOF programs
+ with information about probes. */
+
+#ifndef SHT_SUNW_dof
+# define SHT_SUNW_dof 0x6ffffff4
+#endif
+
+/* Forward declaration. */
+
+static const struct probe_ops dtrace_probe_ops;
+
+/* The following structure represents a single argument for the
+ probe. */
+
+struct dtrace_probe_arg
+{
+ /* The type of the probe argument. */
+ struct type *type;
+
+ /* A string describing the type. */
+ char *type_str;
+
+ /* The argument converted to an internal GDB expression. */
+ struct expression *expr;
+};
+
+typedef struct dtrace_probe_arg dtrace_probe_arg_s;
+DEF_VEC_O (dtrace_probe_arg_s);
+
+/* The following structure represents an enabler for a probe. */
+
+struct dtrace_probe_enabler
+{
+ /* Program counter where the is-enabled probe is installed. The
+ contents (nops, whatever...) stored at this address are
+ architecture dependent. */
+ CORE_ADDR address;
+};
+
+typedef struct dtrace_probe_enabler dtrace_probe_enabler_s;
+DEF_VEC_O (dtrace_probe_enabler_s);
+
+/* The following structure represents a dtrace probe. */
+
+struct dtrace_probe
+{
+ /* Generic information about the probe. This must be the first
+ element of this struct, in order to maintain binary compatibility
+ with the `struct probe' and be able to fully abstract it. */
+ struct probe p;
+
+ /* A probe can have zero or more arguments. */
+ int probe_argc;
+ VEC (dtrace_probe_arg_s) *args;
+
+ /* A probe can have zero or more "enablers" associated with it. */
+ VEC (dtrace_probe_enabler_s) *enablers;
+
+ /* Whether the expressions for the arguments have been built. */
+ unsigned int args_expr_built : 1;
+};
+
+/* Implementation of the probe_is_linespec method. */
+
+static int
+dtrace_probe_is_linespec (const char **linespecp)
+{
+ static const char *const keywords[] = { "-pdtrace", "-probe-dtrace", NULL };
+
+ return probe_is_linespec_by_keyword (linespecp, keywords);
+}
+
+/* DOF programs can contain an arbitrary number of sections of 26
+ different types. In order to support DTrace USDT probes we only
+ need to handle a subset of these section types, fortunately. These
+ section types are defined in the following enumeration.
+
+ See linux/dtrace/dof_defines.h for a complete list of section types
+ along with their values. */
+
+enum dtrace_dof_sect_type
+{
+ /* Null section. */
+ DTRACE_DOF_SECT_TYPE_NONE = 0,
+ /* A dof_ecbdesc_t. */
+ DTRACE_DOF_SECT_TYPE_ECBDESC = 3,
+ /* A string table. */
+ DTRACE_DOF_SECT_TYPE_STRTAB = 8,
+ /* A dof_provider_t */
+ DTRACE_DOF_SECT_TYPE_PROVIDER = 15,
+ /* Array of dof_probe_t */
+ DTRACE_DOF_SECT_TYPE_PROBES = 16,
+ /* An array of probe arg mappings. */
+ DTRACE_DOF_SECT_TYPE_PRARGS = 17,
+ /* An array of probe arg offsets. */
+ DTRACE_DOF_SECT_TYPE_PROFFS = 18,
+ /* An array of probe is-enabled offsets. */
+ DTRACE_DOF_SECT_TYPE_PRENOFFS = 26
+};
+
+/* The following collection of data structures map the structure of
+ DOF entities. Again, we only cover the subset of DOF used to
+ implement USDT probes.
+
+ See linux/dtrace/dof.h header for a complete list of data
+ structures. */
+
+/* Offsets to index the dofh_ident[] array defined below. */
+
+enum dtrace_dof_ident
+{
+ /* First byte of the magic number. */
+ DTRACE_DOF_ID_MAG0 = 0,
+ /* Second byte of the magic number. */
+ DTRACE_DOF_ID_MAG1 = 1,
+ /* Third byte of the magic number. */
+ DTRACE_DOF_ID_MAG2 = 2,
+ /* Fourth byte of the magic number. */
+ DTRACE_DOF_ID_MAG3 = 3,
+ /* An enum_dof_encoding value. */
+ DTRACE_DOF_ID_ENCODING = 5
+};
+
+/* Possible values for dofh_ident[DOF_ID_ENCODING]. */
+
+enum dtrace_dof_encoding
+{
+ /* The DOF program is little-endian. */
+ DTRACE_DOF_ENCODE_LSB = 1,
+ /* The DOF program is big-endian. */
+ DTRACE_DOF_ENCODE_MSB = 2
+};
+
+/* A DOF header, which describes the contents of a DOF program: number
+ of sections, size, etc. */
+
+struct dtrace_dof_hdr
+{
+ /* Identification bytes (see above). */
+ uint8_t dofh_ident[16];
+ /* File attribute flags (if any). */
+ uint32_t dofh_flags;
+ /* Size of file header in bytes. */
+ uint32_t dofh_hdrsize;
+ /* Size of section header in bytes. */
+ uint32_t dofh_secsize;
+ /* Number of section headers. */
+ uint32_t dofh_secnum;
+ /* File offset of section headers. */
+ uint64_t dofh_secoff;
+ /* File size of loadable portion. */
+ uint64_t dofh_loadsz;
+ /* File size of entire DOF file. */
+ uint64_t dofh_filesz;
+ /* Reserved for future use. */
+ uint64_t dofh_pad;
+};
+
+/* A DOF section, whose contents depend on its type. The several
+ supported section types are described in the enum
+ dtrace_dof_sect_type above. */
+
+struct dtrace_dof_sect
+{
+ /* Section type (see the define above). */
+ uint32_t dofs_type;
+ /* Section data memory alignment. */
+ uint32_t dofs_align;
+ /* Section flags (if any). */
+ uint32_t dofs_flags;
+ /* Size of section entry (if table). */
+ uint32_t dofs_entsize;
+ /* DOF + offset points to the section data. */
+ uint64_t dofs_offset;
+ /* Size of section data in bytes. */
+ uint64_t dofs_size;
+};
+
+/* A DOF provider, which is the provider of a probe. */
+
+struct dtrace_dof_provider
+{
+ /* Link to a DTRACE_DOF_SECT_TYPE_STRTAB section. */
+ uint32_t dofpv_strtab;
+ /* Link to a DTRACE_DOF_SECT_TYPE_PROBES section. */
+ uint32_t dofpv_probes;
+ /* Link to a DTRACE_DOF_SECT_TYPE_PRARGS section. */
+ uint32_t dofpv_prargs;
+ /* Link to a DTRACE_DOF_SECT_TYPE_PROFFS section. */
+ uint32_t dofpv_proffs;
+ /* Provider name string. */
+ uint32_t dofpv_name;
+ /* Provider attributes. */
+ uint32_t dofpv_provattr;
+ /* Module attributes. */
+ uint32_t dofpv_modattr;
+ /* Function attributes. */
+ uint32_t dofpv_funcattr;
+ /* Name attributes. */
+ uint32_t dofpv_nameattr;
+ /* Args attributes. */
+ uint32_t dofpv_argsattr;
+ /* Link to a DTRACE_DOF_SECT_PRENOFFS section. */
+ uint32_t dofpv_prenoffs;
+};
+
+/* A set of DOF probes and is-enabled probes sharing a base address
+ and several attributes. The particular locations and attributes of
+ each probe are maintained in arrays in several other DOF sections.
+ See the comment in dtrace_process_dof_probe for details on how
+ these attributes are stored. */
+
+struct dtrace_dof_probe
+{
+ /* Probe base address or offset. */
+ uint64_t dofpr_addr;
+ /* Probe function string. */
+ uint32_t dofpr_func;
+ /* Probe name string. */
+ uint32_t dofpr_name;
+ /* Native argument type strings. */
+ uint32_t dofpr_nargv;
+ /* Translated argument type strings. */
+ uint32_t dofpr_xargv;
+ /* Index of first argument mapping. */
+ uint32_t dofpr_argidx;
+ /* Index of first offset entry. */
+ uint32_t dofpr_offidx;
+ /* Native argument count. */
+ uint8_t dofpr_nargc;
+ /* Translated argument count. */
+ uint8_t dofpr_xargc;
+ /* Number of offset entries for probe. */
+ uint16_t dofpr_noffs;
+ /* Index of first is-enabled offset. */
+ uint32_t dofpr_enoffidx;
+ /* Number of is-enabled offsets. */
+ uint16_t dofpr_nenoffs;
+ /* Reserved for future use. */
+ uint16_t dofpr_pad1;
+ /* Reserved for future use. */
+ uint32_t dofpr_pad2;
+};
+
+/* DOF supports two different encodings: MSB (big-endian) and LSB
+ (little-endian). The encoding is itself encoded in the DOF header.
+ The following function returns an unsigned value in the host
+ endianness. */
+
+#define DOF_UINT(dof, field) \
+ extract_unsigned_integer ((gdb_byte *) &(field), \
+ sizeof ((field)), \
+ (((dof)->dofh_ident[DTRACE_DOF_ID_ENCODING] \
+ == DTRACE_DOF_ENCODE_MSB) \
+ ? BFD_ENDIAN_BIG : BFD_ENDIAN_LITTLE))
+
+/* The following macro applies a given byte offset to a DOF (a pointer
+ to a dtrace_dof_hdr structure) and returns the resulting
+ address. */
+
+#define DTRACE_DOF_PTR(dof, offset) (&((char *) (dof))[(offset)])
+
+/* The following macro returns a pointer to the beginning of a given
+ section in a DOF object. The section is referred to by its index
+ in the sections array. */
+
+#define DTRACE_DOF_SECT(dof, idx) \
+ ((struct dtrace_dof_sect *) \
+ DTRACE_DOF_PTR ((dof), \
+ DOF_UINT ((dof), (dof)->dofh_secoff) \
+ + ((idx) * DOF_UINT ((dof), (dof)->dofh_secsize))))
+
+/* Helper function to examine the probe described by the given PROBE
+ and PROVIDER data structures and add it to the PROBESP vector.
+ STRTAB, OFFTAB, EOFFTAB and ARGTAB are pointers to tables in the
+ DOF program containing the attributes for the probe. */
+
+static void
+dtrace_process_dof_probe (struct objfile *objfile,
+ struct gdbarch *gdbarch, VEC (probe_p) **probesp,
+ struct dtrace_dof_hdr *dof,
+ struct dtrace_dof_probe *probe,
+ struct dtrace_dof_provider *provider,
+ char *strtab, char *offtab, char *eofftab,
+ char *argtab, uint64_t strtab_size)
+{
+ int i, j, num_probes, num_enablers;
+ struct cleanup *cleanup;
+ VEC (dtrace_probe_enabler_s) *enablers;
+ char *p;
+
+ /* Each probe section can define zero or more probes of two
+ different types:
+
+ - probe->dofpr_noffs regular probes whose program counters are
+ stored in 32bit words starting at probe->dofpr_addr +
+ offtab[probe->dofpr_offidx].
+
+ - probe->dofpr_nenoffs is-enabled probes whose program counters
+ are stored in 32bit words starting at probe->dofpr_addr +
+ eofftab[probe->dofpr_enoffidx].
+
+ However is-enabled probes are not probes per-se, but an
+ optimization hack that is implemented in the kernel in a very
+ similar way than normal probes. This is how we support
+ is-enabled probes on GDB:
+
+ - Our probes are always DTrace regular probes.
+
+ - Our probes can be associated with zero or more "enablers". The
+ list of enablers is built from the is-enabled probes defined in
+ the Probe section.
+
+ - Probes having a non-empty list of enablers can be enabled or
+ disabled using the `enable probe' and `disable probe' commands
+ respectively. The `Enabled' column in the output of `info
+ probes' will read `yes' if the enablers are activated, `no'
+ otherwise.
+
+ - Probes having an empty list of enablers are always enabled.
+ The `Enabled' column in the output of `info probes' will
+ read `always'.
+
+ It follows that if there are DTrace is-enabled probes defined for
+ some provider/name but no DTrace regular probes defined then the
+ GDB user wont be able to enable/disable these conditionals. */
+
+ num_probes = DOF_UINT (dof, probe->dofpr_noffs);
+ if (num_probes == 0)
+ return;
+
+ /* Build the list of enablers for the probes defined in this Probe
+ DOF section. */
+ enablers = NULL;
+ cleanup
+ = make_cleanup (VEC_cleanup (dtrace_probe_enabler_s), &enablers);
+ num_enablers = DOF_UINT (dof, probe->dofpr_nenoffs);
+ for (i = 0; i < num_enablers; i++)
+ {
+ struct dtrace_probe_enabler enabler;
+ uint32_t enabler_offset
+ = ((uint32_t *) eofftab)[DOF_UINT (dof, probe->dofpr_enoffidx) + i];
+
+ enabler.address = DOF_UINT (dof, probe->dofpr_addr)
+ + DOF_UINT (dof, enabler_offset);
+ VEC_safe_push (dtrace_probe_enabler_s, enablers, &enabler);
+ }
+
+ for (i = 0; i < num_probes; i++)
+ {
+ uint32_t probe_offset
+ = ((uint32_t *) offtab)[DOF_UINT (dof, probe->dofpr_offidx) + i];
+ struct dtrace_probe *ret
+ = obstack_alloc (&objfile->per_bfd->storage_obstack, sizeof (*ret));
+
+ ret->p.pops = &dtrace_probe_ops;
+ ret->p.arch = gdbarch;
+ ret->args_expr_built = 0;
+
+ /* Set the provider and the name of the probe. */
+ ret->p.provider
+ = xstrdup (strtab + DOF_UINT (dof, provider->dofpv_name));
+ ret->p.name = xstrdup (strtab + DOF_UINT (dof, probe->dofpr_name));
+
+ /* The probe address. */
+ ret->p.address
+ = DOF_UINT (dof, probe->dofpr_addr) + DOF_UINT (dof, probe_offset);
+
+ /* Number of arguments in the probe. */
+ ret->probe_argc = DOF_UINT (dof, probe->dofpr_nargc);
+
+ /* Store argument type descriptions. A description of the type
+ of the argument is in the (J+1)th null-terminated string
+ starting at 'strtab' + 'probe->dofpr_nargv'. */
+ ret->args = NULL;
+ p = strtab + DOF_UINT (dof, probe->dofpr_nargv);
+ for (j = 0; j < ret->probe_argc; j++)
+ {
+ struct dtrace_probe_arg arg;
+ struct expression *expr;
+
+ arg.type_str = xstrdup (p);
+
+ /* Use strtab_size as a sentinel. */
+ while (*p++ != '\0' && p - strtab < strtab_size);
+
+ /* Try to parse a type expression from the type string. If
+ this does not work then we set the type to `long
+ int'. */
+ arg.type = builtin_type (gdbarch)->builtin_long;
+ expr = parse_expression (arg.type_str);
+ if (expr->elts[0].opcode == OP_TYPE)
+ arg.type = expr->elts[1].type;
+
+ VEC_safe_push (dtrace_probe_arg_s, ret->args, &arg);
+ }
+
+ /* Add the vector of enablers to this probe, if any. */
+ ret->enablers = VEC_copy (dtrace_probe_enabler_s, enablers);
+
+ /* Successfully created probe. */
+ VEC_safe_push (probe_p, *probesp, (struct probe *) ret);
+ }
+
+ do_cleanups (cleanup);
+}
+
+/* Helper function to collect the probes described in the DOF program
+ whose header is pointed by DOF and add them to the PROBESP vector.
+ SECT is the ELF section containing the DOF program and OBJFILE is
+ its containing object file. */
+
+static void
+dtrace_process_dof (asection *sect, struct objfile *objfile,
+ VEC (probe_p) **probesp, struct dtrace_dof_hdr *dof)
+{
+ bfd *abfd = objfile->obfd;
+ int size = bfd_get_arch_size (abfd) / 8;
+ struct gdbarch *gdbarch = get_objfile_arch (objfile);
+ struct dtrace_dof_sect *section;
+ int i;
+
+ /* The first step is to check for the DOF magic number. If no valid
+ DOF data is found in the section then a complaint is issued to
+ the user and the section skipped. */
+ if (dof->dofh_ident[DTRACE_DOF_ID_MAG0] != 0x7F
+ || dof->dofh_ident[DTRACE_DOF_ID_MAG1] != 'D'
+ || dof->dofh_ident[DTRACE_DOF_ID_MAG2] != 'O'
+ || dof->dofh_ident[DTRACE_DOF_ID_MAG3] != 'F')
+ goto invalid_dof_data;
+
+ /* Make sure the encoding mark is either DTRACE_DOF_ENCODE_LSB or
+ DTRACE_DOF_ENCODE_MSB. */
+ if (dof->dofh_ident[DTRACE_DOF_ID_ENCODING] != DTRACE_DOF_ENCODE_LSB
+ && dof->dofh_ident[DTRACE_DOF_ID_ENCODING] != DTRACE_DOF_ENCODE_MSB)
+ goto invalid_dof_data;
+
+ /* Make sure this DOF is not an enabling DOF, i.e. there are no ECB
+ Description sections. */
+ section = (struct dtrace_dof_sect *) DTRACE_DOF_PTR (dof,
+ DOF_UINT (dof, dof->dofh_secoff));
+ for (i = 0; i < DOF_UINT (dof, dof->dofh_secnum); i++, section++)
+ if (section->dofs_type == DTRACE_DOF_SECT_TYPE_ECBDESC)
+ return;
+
+ /* Iterate over any section of type Provider and extract the probe
+ information from them. If there are no "provider" sections on
+ the DOF then we just return. */
+ section = (struct dtrace_dof_sect *) DTRACE_DOF_PTR (dof,
+ DOF_UINT (dof, dof->dofh_secoff));
+ for (i = 0; i < DOF_UINT (dof, dof->dofh_secnum); i++, section++)
+ if (DOF_UINT (dof, section->dofs_type) == DTRACE_DOF_SECT_TYPE_PROVIDER)
+ {
+ struct dtrace_dof_provider *provider = (struct dtrace_dof_provider *)
+ DTRACE_DOF_PTR (dof, DOF_UINT (dof, section->dofs_offset));
+ struct dtrace_dof_sect *strtab_s
+ = DTRACE_DOF_SECT (dof, DOF_UINT (dof, provider->dofpv_strtab));
+ struct dtrace_dof_sect *probes_s
+ = DTRACE_DOF_SECT (dof, DOF_UINT (dof, provider->dofpv_probes));
+ struct dtrace_dof_sect *args_s
+ = DTRACE_DOF_SECT (dof, DOF_UINT (dof, provider->dofpv_prargs));
+ struct dtrace_dof_sect *offsets_s
+ = DTRACE_DOF_SECT (dof, DOF_UINT (dof, provider->dofpv_proffs));
+ struct dtrace_dof_sect *eoffsets_s
+ = DTRACE_DOF_SECT (dof, DOF_UINT (dof, provider->dofpv_prenoffs));
+ char *strtab = DTRACE_DOF_PTR (dof, DOF_UINT (dof, strtab_s->dofs_offset));
+ char *offtab = DTRACE_DOF_PTR (dof, DOF_UINT (dof, offsets_s->dofs_offset));
+ char *eofftab = DTRACE_DOF_PTR (dof, DOF_UINT (dof, eoffsets_s->dofs_offset));
+ char *argtab = DTRACE_DOF_PTR (dof, DOF_UINT (dof, args_s->dofs_offset));
+ unsigned int entsize = DOF_UINT (dof, probes_s->dofs_entsize);
+ int num_probes;
+
+ /* Very, unlikely, but could crash gdb if not handled
+ properly. */
+ if (entsize == 0)
+ goto invalid_dof_data;
+
+ num_probes = DOF_UINT (dof, probes_s->dofs_size) / entsize;
+
+ for (i = 0; i < num_probes; i++)
+ {
+ struct dtrace_dof_probe *probe = (struct dtrace_dof_probe *)
+ DTRACE_DOF_PTR (dof, DOF_UINT (dof, probes_s->dofs_offset)
+ + (i * DOF_UINT (dof, probes_s->dofs_entsize)));
+
+ dtrace_process_dof_probe (objfile,
+ gdbarch, probesp,
+ dof, probe,
+ provider, strtab, offtab, eofftab, argtab,
+ DOF_UINT (dof, strtab_s->dofs_size));
+ }
+ }
+
+ return;
+
+ invalid_dof_data:
+ complaint (&symfile_complaints,
+ _("skipping section '%s' which does not contain valid DOF data."),
+ sect->name);
+}
+
+/* Helper function to build the GDB internal expressiosn that, once
+ evaluated, will calculate the values of the arguments of a given
+ PROBE. */
+
+static void
+dtrace_build_arg_exprs (struct dtrace_probe *probe,
+ struct gdbarch *gdbarch)
+{
+ struct parser_state pstate;
+ struct dtrace_probe_arg *arg;
+ int i;
+
+ probe->args_expr_built = 1;
+
+ /* Iterate over the arguments in the probe and build the
+ corresponding GDB internal expression that will generate the
+ value of the argument when executed at the PC of the probe. */
+ for (i = 0; i < probe->probe_argc; i++)
+ {
+ struct cleanup *back_to;
+
+ arg = VEC_index (dtrace_probe_arg_s, probe->args, i);
+
+ /* Initialize the expression buffer in the parser state. The
+ language does not matter, since we are using our own
+ parser. */
+ initialize_expout (&pstate, 10, current_language, gdbarch);
+ back_to = make_cleanup (free_current_contents, &pstate.expout);
+
+ /* The argument value, which is ABI dependent and casted to
+ `long int'. */
+ gdbarch_dtrace_parse_probe_argument (gdbarch, &pstate, i);
+
+ discard_cleanups (back_to);
+
+ /* Casting to the expected type, but only if the type was
+ recognized at probe load time. Otherwise the argument will
+ be evaluated as the long integer passed to the probe. */
+ if (arg->type != NULL)
+ {
+ write_exp_elt_opcode (&pstate, UNOP_CAST);
+ write_exp_elt_type (&pstate, arg->type);
+ write_exp_elt_opcode (&pstate, UNOP_CAST);
+ }
+
+ reallocate_expout (&pstate);
+ arg->expr = pstate.expout;
+ prefixify_expression (arg->expr);
+ }
+}
+
+/* Helper function to return the Nth argument of a given PROBE. */
+
+static struct dtrace_probe_arg *
+dtrace_get_arg (struct dtrace_probe *probe, unsigned n,
+ struct gdbarch *gdbarch)
+{
+ if (!probe->args_expr_built)
+ dtrace_build_arg_exprs (probe, gdbarch);
+
+ return VEC_index (dtrace_probe_arg_s, probe->args, n);
+}
+
+/* Implementation of the get_probes method. */
+
+static void
+dtrace_get_probes (VEC (probe_p) **probesp, struct objfile *objfile)
+{
+ bfd *abfd = objfile->obfd;
+ asection *sect = NULL;
+
+ /* Do nothing in case this is a .debug file, instead of the objfile
+ itself. */
+ if (objfile->separate_debug_objfile_backlink != NULL)
+ return;
+
+ /* Iterate over the sections in OBJFILE looking for DTrace
+ information. */
+ for (sect = abfd->sections; sect != NULL; sect = sect->next)
+ {
+ if (elf_section_data (sect)->this_hdr.sh_type == SHT_SUNW_dof)
+ {
+ struct dtrace_dof_hdr *dof;
+
+ /* Read the contents of the DOF section and then process it to
+ extract the information of any probe defined into it. */
+ if (!bfd_malloc_and_get_section (abfd, sect, (bfd_byte **) &dof))
+ complaint (&symfile_complaints,
+ _("could not obtain the contents of"
+ "section '%s' in objfile `%s'."),
+ sect->name, abfd->filename);
+
+ dtrace_process_dof (sect, objfile, probesp, dof);
+ xfree (dof);
+ }
+ }
+}
+
+/* Helper function to determine whether a given probe is "enabled" or
+ "disabled". A disabled probe is a probe in which one or more
+ enablers are disabled. */
+
+static int
+dtrace_probe_is_enabled (struct dtrace_probe *probe)
+{
+ int i;
+ struct gdbarch *gdbarch = probe->p.arch;
+ struct dtrace_probe_enabler *enabler;
+
+ for (i = 0;
+ VEC_iterate (dtrace_probe_enabler_s, probe->enablers, i, enabler);
+ i++)
+ if (!gdbarch_dtrace_probe_is_enabled (gdbarch, enabler->address))
+ return 0;
+
+ return 1;
+}
+
+/* Implementation of the get_probe_address method. */
+
+static CORE_ADDR
+dtrace_get_probe_address (struct probe *probe, struct objfile *objfile)
+{
+ gdb_assert (probe->pops == &dtrace_probe_ops);
+ return probe->address + ANOFFSET (objfile->section_offsets,
+ SECT_OFF_DATA (objfile));
+}
+
+/* Implementation of the get_probe_argument_count method. */
+
+static unsigned
+dtrace_get_probe_argument_count (struct probe *probe_generic,
+ struct frame_info *frame)
+{
+ struct dtrace_probe *dtrace_probe = (struct dtrace_probe *) probe_generic;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+
+ return dtrace_probe->probe_argc;
+}
+
+/* Implementation of the can_evaluate_probe_arguments method. */
+
+static int
+dtrace_can_evaluate_probe_arguments (struct probe *probe_generic)
+{
+ struct gdbarch *gdbarch = probe_generic->arch;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+ return gdbarch_dtrace_parse_probe_argument_p (gdbarch);
+}
+
+/* Implementation of the evaluate_probe_argument method. */
+
+static struct value *
+dtrace_evaluate_probe_argument (struct probe *probe_generic, unsigned n,
+ struct frame_info *frame)
+{
+ struct gdbarch *gdbarch = probe_generic->arch;
+ struct dtrace_probe *dtrace_probe = (struct dtrace_probe *) probe_generic;
+ struct dtrace_probe_arg *arg;
+ int pos = 0;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+
+ arg = dtrace_get_arg (dtrace_probe, n, gdbarch);
+ return evaluate_subexp_standard (arg->type, arg->expr, &pos, EVAL_NORMAL);
+}
+
+/* Implementation of the compile_to_ax method. */
+
+static void
+dtrace_compile_to_ax (struct probe *probe_generic, struct agent_expr *expr,
+ struct axs_value *value, unsigned n)
+{
+ struct dtrace_probe *dtrace_probe = (struct dtrace_probe *) probe_generic;
+ struct dtrace_probe_arg *arg;
+ union exp_element *pc;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+
+ arg = dtrace_get_arg (dtrace_probe, n, expr->gdbarch);
+
+ pc = arg->expr->elts;
+ gen_expr (arg->expr, &pc, expr, value);
+
+ require_rvalue (expr, value);
+ value->type = arg->type;
+}
+
+/* Implementation of the probe_destroy method. */
+
+static void
+dtrace_probe_destroy (struct probe *probe_generic)
+{
+ struct dtrace_probe *probe = (struct dtrace_probe *) probe_generic;
+ struct dtrace_probe_arg *arg;
+ int i;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+
+ for (i = 0; VEC_iterate (dtrace_probe_arg_s, probe->args, i, arg); i++)
+ {
+ xfree (arg->type_str);
+ xfree (arg->expr);
+ }
+
+ VEC_free (dtrace_probe_enabler_s, probe->enablers);
+ VEC_free (dtrace_probe_arg_s, probe->args);
+}
+
+/* Implementation of the type_name method. */
+
+static const char *
+dtrace_type_name (struct probe *probe_generic)
+{
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+ return "dtrace";
+}
+
+/* Implementation of the gen_info_probes_table_header method. */
+
+static void
+dtrace_gen_info_probes_table_header (VEC (info_probe_column_s) **heads)
+{
+ info_probe_column_s dtrace_probe_column;
+
+ dtrace_probe_column.field_name = "enabled";
+ dtrace_probe_column.print_name = _("Enabled");
+
+ VEC_safe_push (info_probe_column_s, *heads, &dtrace_probe_column);
+}
+
+/* Implementation of the gen_info_probes_table_values method. */
+
+static void
+dtrace_gen_info_probes_table_values (struct probe *probe_generic,
+ VEC (const_char_ptr) **ret)
+{
+ struct dtrace_probe *probe = (struct dtrace_probe *) probe_generic;
+ const char *val = NULL;
+
+ gdb_assert (probe_generic->pops == &dtrace_probe_ops);
+
+ if (VEC_empty (dtrace_probe_enabler_s, probe->enablers))
+ val = "always";
+ else if (!gdbarch_dtrace_probe_is_enabled_p (probe_generic->arch))
+ val = "unknown";
+ else if (dtrace_probe_is_enabled (probe))
+ val = "yes";
+ else
+ val = "no";
+
+ VEC_safe_push (const_char_ptr, *ret, val);
+}
+
+/* Implementation of the enable_probe method. */
+
+static void
+dtrace_enable_probe (struct probe *probe)
+{
+ struct gdbarch *gdbarch = probe->arch;
+ struct dtrace_probe *dtrace_probe = (struct dtrace_probe *) probe;
+ struct dtrace_probe_enabler *enabler;
+ int i;
+
+ gdb_assert (probe->pops == &dtrace_probe_ops);
+
+ /* Enabling a dtrace probe implies patching the text section of the
+ running process, so make sure the inferior is indeed running. */
+ if (ptid_equal (inferior_ptid, null_ptid))
+ error (_("No inferior running"));
+
+ /* Fast path. */
+ if (dtrace_probe_is_enabled (dtrace_probe))
+ return;
+
+ /* Iterate over all defined enabler in the given probe and enable
+ them all using the corresponding gdbarch hook. */
+
+ for (i = 0;
+ VEC_iterate (dtrace_probe_enabler_s, dtrace_probe->enablers, i, enabler);
+ i++)
+ if (gdbarch_dtrace_enable_probe_p (gdbarch))
+ gdbarch_dtrace_enable_probe (gdbarch, enabler->address);
+}
+
+
+/* Implementation of the disable_probe method. */
+
+static void
+dtrace_disable_probe (struct probe *probe)
+{
+ struct gdbarch *gdbarch = probe->arch;
+ struct dtrace_probe *dtrace_probe = (struct dtrace_probe *) probe;
+ struct dtrace_probe_enabler *enabler;
+ int i;
+
+ gdb_assert (probe->pops == &dtrace_probe_ops);
+
+ /* Disabling a dtrace probe implies patching the text section of the
+ running process, so make sure the inferior is indeed running. */
+ if (ptid_equal (inferior_ptid, null_ptid))
+ error (_("No inferior running"));
+
+ /* Fast path. */
+ if (!dtrace_probe_is_enabled (dtrace_probe))
+ return;
+
+ /* Are we trying to disable a probe that does not have any enabler
+ associated? */
+ if (VEC_empty (dtrace_probe_enabler_s, dtrace_probe->enablers))
+ error (_("Probe %s:%s cannot be disabled: no enablers."), probe->provider, probe->name);
+
+ /* Iterate over all defined enabler in the given probe and disable
+ them all using the corresponding gdbarch hook. */
+
+ for (i = 0;
+ VEC_iterate (dtrace_probe_enabler_s, dtrace_probe->enablers, i, enabler);
+ i++)
+ if (gdbarch_dtrace_disable_probe_p (gdbarch))
+ gdbarch_dtrace_disable_probe (gdbarch, enabler->address);
+}
+
+/* DTrace probe_ops. */
+
+static const struct probe_ops dtrace_probe_ops =
+{
+ dtrace_probe_is_linespec,
+ dtrace_get_probes,
+ dtrace_get_probe_address,
+ dtrace_get_probe_argument_count,
+ dtrace_can_evaluate_probe_arguments,
+ dtrace_evaluate_probe_argument,
+ dtrace_compile_to_ax,
+ NULL, /* set_semaphore */
+ NULL, /* clear_semaphore */
+ dtrace_probe_destroy,
+ dtrace_type_name,
+ dtrace_gen_info_probes_table_header,
+ dtrace_gen_info_probes_table_values,
+ dtrace_enable_probe,
+ dtrace_disable_probe
+};
+
+/* Implementation of the `info probes dtrace' command. */
+
+static void
+info_probes_dtrace_command (char *arg, int from_tty)
+{
+ info_probes_for_ops (arg, from_tty, &dtrace_probe_ops);
+}
+
+void _initialize_dtrace_probe (void);
+
+void
+_initialize_dtrace_probe (void)
+{
+ VEC_safe_push (probe_ops_cp, all_probe_ops, &dtrace_probe_ops);
+
+ add_cmd ("dtrace", class_info, info_probes_dtrace_command,
+ _("\
+Show information about DTrace static probes.\n\
+Usage: info probes dtrace [PROVIDER [NAME [OBJECT]]]\n\
+Each argument is a regular expression, used to select probes.\n\
+PROVIDER matches probe provider names.\n\
+NAME matches the probe names.\n\
+OBJECT matches the executable or shared library name."),
+ info_probes_cmdlist_get ());
+}
projects / binutils-gdb.git / commitdiff