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Diffstat (limited to 'arch/x86/kernel/callthunks.c')
-rw-r--r--arch/x86/kernel/callthunks.c38
1 files changed, 28 insertions, 10 deletions
diff --git a/arch/x86/kernel/callthunks.c b/arch/x86/kernel/callthunks.c
index 64ad2ddea1..e92ff0c11d 100644
--- a/arch/x86/kernel/callthunks.c
+++ b/arch/x86/kernel/callthunks.c
@@ -24,6 +24,8 @@
static int __initdata_or_module debug_callthunks;
+#define MAX_PATCH_LEN (255-1)
+
#define prdbg(fmt, args...) \
do { \
if (debug_callthunks) \
@@ -42,8 +44,8 @@ DEFINE_PER_CPU(u64, __x86_call_count);
DEFINE_PER_CPU(u64, __x86_ret_count);
DEFINE_PER_CPU(u64, __x86_stuffs_count);
DEFINE_PER_CPU(u64, __x86_ctxsw_count);
-EXPORT_SYMBOL_GPL(__x86_ctxsw_count);
-EXPORT_SYMBOL_GPL(__x86_call_count);
+EXPORT_PER_CPU_SYMBOL_GPL(__x86_ctxsw_count);
+EXPORT_PER_CPU_SYMBOL_GPL(__x86_call_count);
#endif
extern s32 __call_sites[], __call_sites_end[];
@@ -179,10 +181,15 @@ static const u8 nops[] = {
static void *patch_dest(void *dest, bool direct)
{
unsigned int tsize = SKL_TMPL_SIZE;
+ u8 insn_buff[MAX_PATCH_LEN];
u8 *pad = dest - tsize;
+ memcpy(insn_buff, skl_call_thunk_template, tsize);
+ apply_relocation(insn_buff, tsize, pad,
+ skl_call_thunk_template, tsize);
+
/* Already patched? */
- if (!bcmp(pad, skl_call_thunk_template, tsize))
+ if (!bcmp(pad, insn_buff, tsize))
return pad;
/* Ensure there are nops */
@@ -192,9 +199,9 @@ static void *patch_dest(void *dest, bool direct)
}
if (direct)
- memcpy(pad, skl_call_thunk_template, tsize);
+ memcpy(pad, insn_buff, tsize);
else
- text_poke_copy_locked(pad, skl_call_thunk_template, tsize, true);
+ text_poke_copy_locked(pad, insn_buff, tsize, true);
return pad;
}
@@ -290,20 +297,27 @@ void *callthunks_translate_call_dest(void *dest)
static bool is_callthunk(void *addr)
{
unsigned int tmpl_size = SKL_TMPL_SIZE;
- void *tmpl = skl_call_thunk_template;
+ u8 insn_buff[MAX_PATCH_LEN];
unsigned long dest;
+ u8 *pad;
dest = roundup((unsigned long)addr, CONFIG_FUNCTION_ALIGNMENT);
if (!thunks_initialized || skip_addr((void *)dest))
return false;
- return !bcmp((void *)(dest - tmpl_size), tmpl, tmpl_size);
+ pad = (void *)(dest - tmpl_size);
+
+ memcpy(insn_buff, skl_call_thunk_template, tmpl_size);
+ apply_relocation(insn_buff, tmpl_size, pad,
+ skl_call_thunk_template, tmpl_size);
+
+ return !bcmp(pad, insn_buff, tmpl_size);
}
-int x86_call_depth_emit_accounting(u8 **pprog, void *func)
+int x86_call_depth_emit_accounting(u8 **pprog, void *func, void *ip)
{
unsigned int tmpl_size = SKL_TMPL_SIZE;
- void *tmpl = skl_call_thunk_template;
+ u8 insn_buff[MAX_PATCH_LEN];
if (!thunks_initialized)
return 0;
@@ -312,7 +326,11 @@ int x86_call_depth_emit_accounting(u8 **pprog, void *func)
if (func && is_callthunk(func))
return 0;
- memcpy(*pprog, tmpl, tmpl_size);
+ memcpy(insn_buff, skl_call_thunk_template, tmpl_size);
+ apply_relocation(insn_buff, tmpl_size, ip,
+ skl_call_thunk_template, tmpl_size);
+
+ memcpy(*pprog, insn_buff, tmpl_size);
*pprog += tmpl_size;
return tmpl_size;
}