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target/arm: Merge allocation of the cpreg and its name

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Simplify freeing cp_regs hash table entries by using a single
allocation for the entire value.

This fixes a theoretical bug if we were to ever free the entire
hash table, because we've been installing string literal constants
into the cpreg structure in define_arm_vh_e2h_redirects_aliases.
However, at present we only free entries created for AArch32
wildcard cpregs which get overwritten by more specific cpregs,
so this bug is never exposed.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20220501055028.646596-13-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Richard Henderson 2022-04-30 22:49:54 -07:00 committed by Peter Maydell
parent 5860362d25
commit c27f5d3a83
2 changed files with 9 additions and 17 deletions
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16
target/arm/cpu.c
View File

@ -1071,27 +1071,13 @@ uint64_t arm_cpu_mp_affinity(int idx, uint8_t clustersz)
return (Aff1 << ARM_AFF1_SHIFT) | Aff0;
}
static void cpreg_hashtable_data_destroy(gpointer data)
{
/*
* Destroy function for cpu->cp_regs hashtable data entries.
* We must free the name string because it was g_strdup()ed in
* add_cpreg_to_hashtable(). It's OK to cast away the 'const'
* from r->name because we know we definitely allocated it.
*/
ARMCPRegInfo *r = data;
g_free((void *)r->name);
g_free(r);
}
static void arm_cpu_initfn(Object *obj)
{
ARMCPU *cpu = ARM_CPU(obj);
cpu_set_cpustate_pointers(cpu);
cpu->cp_regs = g_hash_table_new_full(g_direct_hash, g_direct_equal,
NULL, cpreg_hashtable_data_destroy);
NULL, g_free);
QLIST_INIT(&cpu->pre_el_change_hooks);
QLIST_INIT(&cpu->el_change_hooks);

10
target/arm/helper.c
View File

@ -8506,11 +8506,17 @@ static void add_cpreg_to_hashtable(ARMCPU *cpu, const ARMCPRegInfo *r,
* add a single reginfo struct to the hash table.
*/
uint32_t key;
ARMCPRegInfo *r2 = g_memdup(r, sizeof(ARMCPRegInfo));
ARMCPRegInfo *r2;
int is64 = (r->type & ARM_CP_64BIT) ? 1 : 0;
int ns = (secstate & ARM_CP_SECSTATE_NS) ? 1 : 0;
size_t name_len;
/* Combine cpreg and name into one allocation. */
name_len = strlen(name) + 1;
r2 = g_malloc(sizeof(*r2) + name_len);
*r2 = *r;
r2->name = memcpy(r2 + 1, name, name_len);
r2->name = g_strdup(name);
/* Reset the secure state to the specific incoming state. This is
* necessary as the register may have been defined with both states.
*/