diff mbox series

[Xen-devel,v4,3/7] xen/arm32: entry: Add missing trap_reset entry

Message ID 20180202141925.19387-4-julien.grall@linaro.org
State Accepted
Commit 00268cc91270c7b0aa3a1906bf7e7702db9c61c1
Headers show
Series xen/arm32: Branch predictor hardening (XSA-254 variant 2) | expand

Commit Message

Julien Grall Feb. 2, 2018, 2:19 p.m. UTC
At the moment, the reset vector is defined as .word 0 (e.g andeq r0, r0,
r0).

This is rather unintuitive and will result to execute the trap
undefined. Instead introduce trap helpers for reset and will generate an
error message in the unlikely case that reset will be called.

This is part of XSA-254.

Signed-off-by: Julien Grall <julien.grall@linaro.org>

---
    Changes in v2:
        - Replace .word 0 by trap_reset
---
 xen/arch/arm/arm32/entry.S | 3 ++-
 xen/arch/arm/arm32/traps.c | 5 +++++
 2 files changed, 7 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/xen/arch/arm/arm32/entry.S b/xen/arch/arm/arm32/entry.S
index c6490d2847..64876c1184 100644
--- a/xen/arch/arm/arm32/entry.S
+++ b/xen/arch/arm/arm32/entry.S
@@ -137,7 +137,7 @@  trap_##trap:                                                            \
 
         .align 5
 GLOBAL(hyp_traps_vector)
-        .word 0                         /* 0x00 - Reset */
+        b trap_reset                    /* 0x00 - Reset */
         b trap_undefined_instruction    /* 0x04 - Undefined Instruction */
         b trap_hypervisor_call          /* 0x08 - Hypervisor Call */
         b trap_prefetch_abort           /* 0x0c - Prefetch Abort */
@@ -146,6 +146,7 @@  GLOBAL(hyp_traps_vector)
         b trap_irq                      /* 0x18 - IRQ */
         b trap_fiq                      /* 0x1c - FIQ */
 
+DEFINE_TRAP_ENTRY(reset)
 DEFINE_TRAP_ENTRY(undefined_instruction)
 DEFINE_TRAP_ENTRY(hypervisor_call)
 DEFINE_TRAP_ENTRY(prefetch_abort)
diff --git a/xen/arch/arm/arm32/traps.c b/xen/arch/arm/arm32/traps.c
index 705255883e..4f27543dec 100644
--- a/xen/arch/arm/arm32/traps.c
+++ b/xen/arch/arm/arm32/traps.c
@@ -23,6 +23,11 @@ 
 
 #include <asm/processor.h>
 
+void do_trap_reset(struct cpu_user_regs *regs)
+{
+    do_unexpected_trap("Reset", regs);
+}
+
 void do_trap_undefined_instruction(struct cpu_user_regs *regs)
 {
     uint32_t pc = regs->pc;