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Make dcache multi-target-safe

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By inspection, I noticed that this code in dcache.c is not
multi-target-aware:

  /* If this is a different inferior from what we've recorded,
     flush the cache.  */

  if (inferior_ptid != dcache->ptid)

This doesn't take into account that threads of different targets may
have the same ptid.

Fixed by also storing/comparing the process_stratum_target.

Tested on x86-64-linux-gnu, native and gdbserver.

Change-Id: I4d9d74052c696b72d28cb1c77b697b911725c8d3
This commit is contained in:
Pedro Alves
2021-09-24 15:38:20 +01:00
parent a13af434cf
commit 604386598d
1 changed files with 11 additions and 3 deletions
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14
gdb/dcache.c
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@@ -116,6 +116,10 @@ struct dcache_struct
/* The ptid of last inferior to use cache or null_ptid. */
ptid_t ptid;
/* The process target of last inferior to use the cache or
nullptr. */
process_stratum_target *proc_target;
};
typedef void (block_func) (struct dcache_block *block, void *param);
@@ -249,6 +253,7 @@ dcache_invalidate (DCACHE *dcache)
dcache->oldest = NULL;
dcache->size = 0;
dcache->ptid = null_ptid;
dcache->proc_target = nullptr;
if (dcache->line_size != dcache_line_size)
{
@@ -453,6 +458,7 @@ dcache_init (void)
dcache->size = 0;
dcache->line_size = dcache_line_size;
dcache->ptid = null_ptid;
dcache->proc_target = nullptr;
return dcache;
}
@@ -470,13 +476,15 @@ dcache_read_memory_partial (struct target_ops *ops, DCACHE *dcache,
{
ULONGEST i;
/* If this is a different inferior from what we've recorded,
flush the cache. */
/* If this is a different thread from what we've recorded, flush the
cache. */
if (inferior_ptid != dcache->ptid)
process_stratum_target *proc_target = current_inferior ()->process_target ();
if (proc_target != dcache->proc_target || inferior_ptid != dcache->ptid)
{
dcache_invalidate (dcache);
dcache->ptid = inferior_ptid;
dcache->proc_target = proc_target;
}
for (i = 0; i < len; i++)