[RFA 3/7] New gdbserver functionality
Gary Benson
gbenson@redhat.com
Thu May 16 14:48:00 GMT 2013
This patch updates gdbserver to allow arguments to be passed in the
annex of qXfer:libraries-svr4:read to allow that function to transfer
partial lists of libraries. The ability of gdbserver to support
these arguments is indicated by a qSupported response containing
"augmented-libraries-svr4-read+".
-------------- next part --------------
2013-05-16 Gary Benson <gbenson@redhat.com>
* server.c (handle_query): Add "augmented-libraries-svr4-read+"
to qSupported response when appropriate.
(handle_qxfer_libraries_svr4): Allow qXfer:libraries-svr4:read
with nonzero-length annex.
* linux-low.c (linux_qxfer_libraries_svr4): Parse and handle
arguments supplied in annex.
diff --git a/gdb/gdbserver/server.c b/gdb/gdbserver/server.c
index 6bb36d8..0a8f68b 100644
--- a/gdb/gdbserver/server.c
+++ b/gdb/gdbserver/server.c
@@ -1115,8 +1115,7 @@ handle_qxfer_libraries_svr4 (const char *annex,
if (writebuf != NULL)
return -2;
- if (annex[0] != '\0' || !target_running ()
- || the_target->qxfer_libraries_svr4 == NULL)
+ if (!target_running () || the_target->qxfer_libraries_svr4 == NULL)
return -1;
return the_target->qxfer_libraries_svr4 (annex, readbuf, writebuf, offset, len);
@@ -1743,7 +1742,8 @@ handle_query (char *own_buf, int packet_len, int *new_packet_len_p)
PBUFSIZ - 1);
if (the_target->qxfer_libraries_svr4 != NULL)
- strcat (own_buf, ";qXfer:libraries-svr4:read+");
+ strcat (own_buf, ";qXfer:libraries-svr4:read+"
+ ";augmented-libraries-svr4-read+");
else
{
/* We do not have any hook to indicate whether the non-SVR4 target
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index 72c51e0..beb3b8f 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -5677,6 +5677,12 @@ linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
};
const struct link_map_offsets *lmo;
unsigned int machine;
+ int ptr_size;
+ CORE_ADDR lm_addr = 0, lm_prev = 0;
+ int allocated = 1024;
+ char *p;
+ CORE_ADDR l_name, l_addr, l_ld, l_next, l_prev;
+ int header_done = 0;
if (writebuf != NULL)
return -2;
@@ -5687,128 +5693,146 @@ linux_qxfer_libraries_svr4 (const char *annex, unsigned char *readbuf,
xsnprintf (filename, sizeof filename, "/proc/%d/exe", pid);
is_elf64 = elf_64_file_p (filename, &machine);
lmo = is_elf64 ? &lmo_64bit_offsets : &lmo_32bit_offsets;
+ ptr_size = is_elf64 ? 8 : 4;
- if (priv->r_debug == 0)
- priv->r_debug = get_r_debug (pid, is_elf64);
+ if (annex[0] == '\0')
+ {
+ int r_version = 0;
- /* We failed to find DT_DEBUG. Such situation will not change for this
- inferior - do not retry it. Report it to GDB as E01, see for the reasons
- at the GDB solib-svr4.c side. */
- if (priv->r_debug == (CORE_ADDR) -1)
- return -1;
+ if (priv->r_debug == 0)
+ priv->r_debug = get_r_debug (pid, is_elf64);
- if (priv->r_debug == 0)
- {
- document = xstrdup ("<library-list-svr4 version=\"1.0\"/>\n");
+ /* We failed to find DT_DEBUG. Such situation will not change
+ for this inferior - do not retry it. Report it to GDB as
+ E01, see for the reasons at the GDB solib-svr4.c side. */
+ if (priv->r_debug == (CORE_ADDR) -1)
+ return -1;
+
+ if (priv->r_debug != 0)
+ {
+ if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
+ (unsigned char *) &r_version,
+ sizeof (r_version)) != 0
+ || r_version != 1)
+ {
+ warning ("unexpected r_debug version %d", r_version);
+ }
+ else if (read_one_ptr (priv->r_debug + lmo->r_map_offset,
+ &lm_addr, ptr_size) != 0)
+ {
+ warning ("unable to read r_map from 0x%lx",
+ (long) priv->r_debug + lmo->r_map_offset);
+ }
+ }
}
else
{
- int allocated = 1024;
- char *p;
- const int ptr_size = is_elf64 ? 8 : 4;
- CORE_ADDR lm_addr, lm_prev, l_name, l_addr, l_ld, l_next, l_prev;
- int r_version, header_done = 0;
-
- document = xmalloc (allocated);
- strcpy (document, "<library-list-svr4 version=\"1.0\"");
- p = document + strlen (document);
-
- r_version = 0;
- if (linux_read_memory (priv->r_debug + lmo->r_version_offset,
- (unsigned char *) &r_version,
- sizeof (r_version)) != 0
- || r_version != 1)
+ while (annex[0] != '\0')
{
- warning ("unexpected r_debug version %d", r_version);
- goto done;
+ const char *sep;
+ CORE_ADDR *addrp;
+ int len;
+
+ sep = strchr (annex, '=');
+ if (!sep)
+ break;
+
+ len = sep - annex;
+ if (len == 5 && !strncmp (annex, "start", 5))
+ addrp = &lm_addr;
+ else if (len == 4 && !strncmp (annex, "prev", 4))
+ addrp = &lm_prev;
+ else
+ {
+ annex = strchr (sep, ';');
+ if (!annex)
+ break;
+ annex++;
+ continue;
+ }
+
+ annex = decode_address_to_semicolon (addrp, sep + 1);
}
+ }
- if (read_one_ptr (priv->r_debug + lmo->r_map_offset,
- &lm_addr, ptr_size) != 0)
+ document = xmalloc (allocated);
+ strcpy (document, "<library-list-svr4 version=\"1.0\"");
+ p = document + strlen (document);
+
+ while (lm_addr
+ && read_one_ptr (lm_addr + lmo->l_name_offset,
+ &l_name, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_addr_offset,
+ &l_addr, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_ld_offset,
+ &l_ld, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_prev_offset,
+ &l_prev, ptr_size) == 0
+ && read_one_ptr (lm_addr + lmo->l_next_offset,
+ &l_next, ptr_size) == 0)
+ {
+ unsigned char libname[PATH_MAX];
+
+ if (lm_prev != l_prev)
{
- warning ("unable to read r_map from 0x%lx",
- (long) priv->r_debug + lmo->r_map_offset);
- goto done;
+ warning ("Corrupted shared library list: 0x%lx != 0x%lx",
+ (long) lm_prev, (long) l_prev);
+ break;
}
- lm_prev = 0;
- while (read_one_ptr (lm_addr + lmo->l_name_offset,
- &l_name, ptr_size) == 0
- && read_one_ptr (lm_addr + lmo->l_addr_offset,
- &l_addr, ptr_size) == 0
- && read_one_ptr (lm_addr + lmo->l_ld_offset,
- &l_ld, ptr_size) == 0
- && read_one_ptr (lm_addr + lmo->l_prev_offset,
- &l_prev, ptr_size) == 0
- && read_one_ptr (lm_addr + lmo->l_next_offset,
- &l_next, ptr_size) == 0)
+ /* Not checking for error because reading may stop before
+ we've got PATH_MAX worth of characters. */
+ libname[0] = '\0';
+ linux_read_memory (l_name, libname, sizeof (libname) - 1);
+ libname[sizeof (libname) - 1] = '\0';
+ if (libname[0] != '\0')
{
- unsigned char libname[PATH_MAX];
+ /* 6x the size for xml_escape_text below. */
+ size_t len = 6 * strlen ((char *) libname);
+ char *name;
- if (lm_prev != l_prev)
+ if (!header_done)
{
- warning ("Corrupted shared library list: 0x%lx != 0x%lx",
- (long) lm_prev, (long) l_prev);
- break;
+ /* Terminate `<library-list-svr4'. */
+ *p++ = '>';
+ header_done = 1;
}
- /* Not checking for error because reading may stop before
- we've got PATH_MAX worth of characters. */
- libname[0] = '\0';
- linux_read_memory (l_name, libname, sizeof (libname) - 1);
- libname[sizeof (libname) - 1] = '\0';
- if (libname[0] != '\0')
+ while (allocated < p - document + len + 200)
{
- /* 6x the size for xml_escape_text below. */
- size_t len = 6 * strlen ((char *) libname);
- char *name;
-
- if (!header_done)
- {
- /* Terminate `<library-list-svr4'. */
- *p++ = '>';
- header_done = 1;
- }
-
- while (allocated < p - document + len + 200)
- {
- /* Expand to guarantee sufficient storage. */
- uintptr_t document_len = p - document;
-
- document = xrealloc (document, 2 * allocated);
- allocated *= 2;
- p = document + document_len;
- }
+ /* Expand to guarantee sufficient storage. */
+ uintptr_t document_len = p - document;
- name = xml_escape_text ((char *) libname);
- p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" "
- "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
- name, (unsigned long) lm_addr,
- (unsigned long) l_addr, (unsigned long) l_ld);
- free (name);
- }
- else if (lm_prev == 0)
- {
- sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr);
- p = p + strlen (p);
+ document = xrealloc (document, 2 * allocated);
+ allocated *= 2;
+ p = document + document_len;
}
- if (l_next == 0)
- break;
-
- lm_prev = lm_addr;
- lm_addr = l_next;
+ name = xml_escape_text ((char *) libname);
+ p += sprintf (p, "<library name=\"%s\" lm=\"0x%lx\" "
+ "l_addr=\"0x%lx\" l_ld=\"0x%lx\"/>",
+ name, (unsigned long) lm_addr,
+ (unsigned long) l_addr, (unsigned long) l_ld);
+ free (name);
}
- done:
- if (!header_done)
+ else if (lm_prev == 0)
{
- /* Empty list; terminate `<library-list-svr4'. */
- strcpy (p, "/>");
+ sprintf (p, " main-lm=\"0x%lx\"", (unsigned long) lm_addr);
+ p = p + strlen (p);
}
- else
- strcpy (p, "</library-list-svr4>");
+
+ lm_prev = lm_addr;
+ lm_addr = l_next;
}
+ if (!header_done)
+ {
+ /* Empty list; terminate `<library-list-svr4'. */
+ strcpy (p, "/>");
+ }
+ else
+ strcpy (p, "</library-list-svr4>");
+
document_len = strlen (document);
if (offset < document_len)
document_len -= offset;
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