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gdb/sim: add support for exporting memory map

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This allows gdb to quickly dump & process the memory map that the sim
knows about.  This isn't fully accurate, but is largely limited by the
gdb memory map format.  While the sim supports RWX bits, gdb can only
handle RW or RO regions.
This commit is contained in:
Mike Frysinger
2015-12-29 23:52:57 -05:00
parent f478212851
commit e904f56d02
6 changed files with 98 additions and 0 deletions
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57
sim/common/sim-core.c
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@@ -452,6 +452,63 @@ sim_core_translate (sim_core_mapping *mapping,
}
#if EXTERN_SIM_CORE_P
/* See include/gdb/remote-sim.h. */
char *
sim_memory_map (SIM_DESC sd)
{
sim_core *core = STATE_CORE (sd);
unsigned map;
char *s1, *s2, *entry;
s1 = xstrdup (
"<?xml version='1.0'?>\n"
"<!DOCTYPE memory-map PUBLIC '+//IDN gnu.org//DTD GDB Memory Map V1.0//EN'"
" 'http://sourceware.org/gdb/gdb-memory-map.dtd'>\n"
"<memory-map>\n");
for (map = 0; map < nr_maps; ++map)
{
sim_core_mapping *mapping;
for (mapping = core->common.map[map].first;
mapping != NULL;
mapping = mapping->next)
{
/* GDB can only handle a single address space. */
if (mapping->level != 0)
continue;
entry = xasprintf ("<memory type='ram' start='%#x' length='%#x'/>\n",
mapping->base, mapping->nr_bytes);
/* The sim memory map is organized by access, not by addresses.
So a RWX memory map will have three independent mappings.
GDB's format cannot support overlapping regions, so we have
to filter those out.
Further, GDB can only handle RX ("rom") or RWX ("ram") mappings.
We just emit "ram" everywhere to keep it simple. If GDB ever
gains support for more stuff, we can expand this.
Using strstr is kind of hacky, but as long as the map is not huge
(we're talking <10K), should be fine. */
if (strstr (s1, entry) == NULL)
{
s2 = concat (s1, entry, NULL);
free (s1);
s1 = s2;
}
free (entry);
}
}
s2 = concat (s1, "</memory-map>", NULL);
free (s1);
return s2;
}
#endif
#if EXTERN_SIM_CORE_P
unsigned
sim_core_read_buffer (SIM_DESC sd,