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target/mips: tcg: detect out-of-bounds accesses to cpu_gpr and cpu_gpr_hi 

In some cases (for example gen_compute_branch_nm in
nanomips_translate.c.inc) registers can be unused
on some paths and a negative value is passed in that case:

        gen_compute_branch_nm(ctx, OPC_BPOSGE32, 4, -1, -2,
                              imm << 1);

To avoid an out of bounds access in those cases, introduce
assertions.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2023-04-03 19:28:36 +02:00
parent cc03dfa827
commit dfae46c3ba
1 changed files with 4 additions and 0 deletions
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4
target/mips/tcg/translate.c
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@ -1223,6 +1223,7 @@ static const char regnames_LO[][4] = {
/* General purpose registers moves. */ /* General purpose registers moves. */
void gen_load_gpr(TCGv t, int reg) void gen_load_gpr(TCGv t, int reg)
{ {
assert(reg >= 0 && reg <= ARRAY_SIZE(cpu_gpr));
if (reg == 0) { if (reg == 0) {
tcg_gen_movi_tl(t, 0); tcg_gen_movi_tl(t, 0);
} else { } else {
@ -1232,6 +1233,7 @@ void gen_load_gpr(TCGv t, int reg)
void gen_store_gpr(TCGv t, int reg) void gen_store_gpr(TCGv t, int reg)
{ {
assert(reg >= 0 && reg <= ARRAY_SIZE(cpu_gpr));
if (reg != 0) { if (reg != 0) {
tcg_gen_mov_tl(cpu_gpr[reg], t); tcg_gen_mov_tl(cpu_gpr[reg], t);
} }
@ -1240,6 +1242,7 @@ void gen_store_gpr(TCGv t, int reg)
#if defined(TARGET_MIPS64) #if defined(TARGET_MIPS64)
void gen_load_gpr_hi(TCGv_i64 t, int reg) void gen_load_gpr_hi(TCGv_i64 t, int reg)
{ {
assert(reg >= 0 && reg <= ARRAY_SIZE(cpu_gpr_hi));
if (reg == 0) { if (reg == 0) {
tcg_gen_movi_i64(t, 0); tcg_gen_movi_i64(t, 0);
} else { } else {
@ -1249,6 +1252,7 @@ void gen_load_gpr_hi(TCGv_i64 t, int reg)
void gen_store_gpr_hi(TCGv_i64 t, int reg) void gen_store_gpr_hi(TCGv_i64 t, int reg)
{ {
assert(reg >= 0 && reg <= ARRAY_SIZE(cpu_gpr_hi));
if (reg != 0) { if (reg != 0) {
tcg_gen_mov_i64(cpu_gpr_hi[reg], t); tcg_gen_mov_i64(cpu_gpr_hi[reg], t);
} }