diff --git a/gcc/config/arm/arm.c b/gcc/config/arm/arm.c index d00849c..60fef78 100644 --- a/gcc/config/arm/arm.c +++ b/gcc/config/arm/arm.c @@ -10347,6 +10347,13 @@ load_multiple_sequence (rtx *operands, int nops, int *regs, int *saved_order, || (i != nops - 1 && unsorted_regs[i] == base_reg)) return 0; + /* Don't allow SP to be loaded unless it is also the base + register. It guarantees that SP is reset correctly when + an LDM instruction is interrupted. Otherwise, we might + end up with a corrupt stack. */ + if (unsorted_regs[i] == SP_REGNUM && base_reg != SP_REGNUM) + return 0; + unsorted_offsets[i] = INTVAL (offset); if (i == 0 || unsorted_offsets[i] < unsorted_offsets[order[0]]) order[0] = i;