gdb/arm: Fix prologue analysis to support vpush
While working on adding support for Non-secure/Secure modes unwinding,
I noticed that the prologue analysis lacked support for vpush, which
is used for instance in the CMSE stub routine.
This patch updates thumb_analyze_prologue accordingly, adding support
for vpush of D-registers.
Signed-off-by: Christophe Lyon <christophe.lyon@foss.st.com>
Signed-off-by: Christophe Lyon <christophe.lyon@arm.com>
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index cc77739..66e26e6 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -902,6 +902,35 @@ thumb_analyze_prologue (struct gdbarch *gdbarch,
regs[bits (insn, 0, 3)] = addr;
}
+ /* vstmdb Rn{!}, { D-registers } (aka vpush). */
+ else if ((insn & 0xff20) == 0xed20
+ && (inst2 & 0x0f00) == 0x0b00
+ && pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
+ {
+ /* Address SP points to. */
+ pv_t addr = regs[bits (insn, 0, 3)];
+
+ /* Number of registers saved. */
+ unsigned int number = bits (inst2, 0, 7) >> 1;
+
+ /* First register to save. */
+ int vd = bits (inst2, 12, 15) | (bits (insn, 6, 6) << 4);
+
+ if (stack.store_would_trash (addr))
+ break;
+
+ /* Calculate offsets of saved registers. */
+ for (; number > 0; number--)
+ {
+ addr = pv_add_constant (addr, -8);
+ stack.store (addr, 8, pv_register (ARM_D0_REGNUM
+ + vd + number, 0));
+ }
+
+ /* Writeback SP to account for the saved registers. */
+ regs[bits (insn, 0, 3)] = addr;
+ }
+
else if ((insn & 0xff50) == 0xe940 /* strd Rt, Rt2,
[Rn, #+/-imm]{!} */
&& pv_is_register (regs[bits (insn, 0, 3)], ARM_SP_REGNUM))
