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target/arm: Use v7m_stack_read() for reading the frame signature

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In commit 95695effe8caa552b8f2 we changed the v7M/v8M stack
pop code to use a new v7m_stack_read() function that checks
whether the read should fail due to an MPU or bus abort.
We missed one call though, the one which reads the signature
word for the callee-saved register part of the frame.

Correct the omission.

Backports commit 4818bad98c8212fbbb0525d10761b6b65279ab92 from qemu
This commit is contained in:
Peter Maydell 2018-04-26 09:02:08 -04:00 committed by Lioncash
parent bec50934ad
commit 43e7478d3f
No known key found for this signature in database
GPG key ID: 4E3C3CC1031BA9C7
1 changed files with 5 additions and 4 deletions
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9
qemu/target/arm/helper.c
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@ -6153,7 +6153,6 @@ static bool v7m_push_stack(ARMCPU *cpu)
static void do_v7m_exception_exit(ARMCPU *cpu) static void do_v7m_exception_exit(ARMCPU *cpu)
{ {
CPUARMState *env = &cpu->env; CPUARMState *env = &cpu->env;
CPUState *cs = CPU(cpu);
uint32_t excret; uint32_t excret;
uint32_t xpsr; uint32_t xpsr;
bool ufault = false; bool ufault = false;
@ -6350,9 +6349,11 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
((excret & R_V7M_EXCRET_ES_MASK) == 0 || ((excret & R_V7M_EXCRET_ES_MASK) == 0 ||
(excret & R_V7M_EXCRET_DCRS_MASK) == 0)) { (excret & R_V7M_EXCRET_DCRS_MASK) == 0)) {
uint32_t expected_sig = 0xfefa125b; uint32_t expected_sig = 0xfefa125b;
uint32_t actual_sig = ldl_phys(cs->as, frameptr); uint32_t actual_sig;
if (expected_sig != actual_sig) { pop_ok = v7m_stack_read(cpu, &actual_sig, frameptr, mmu_idx);
if (pop_ok && expected_sig != actual_sig) {
/* Take a SecureFault on the current stack */ /* Take a SecureFault on the current stack */
env->v7m.sfsr |= R_V7M_SFSR_INVIS_MASK; env->v7m.sfsr |= R_V7M_SFSR_INVIS_MASK;
// Unicorn: commented out // Unicorn: commented out
@ -6364,7 +6365,7 @@ static void do_v7m_exception_exit(ARMCPU *cpu)
return; return;
} }
pop_ok = pop_ok = pop_ok &&
v7m_stack_read(cpu, &env->regs[4], frameptr + 0x8, mmu_idx) && v7m_stack_read(cpu, &env->regs[4], frameptr + 0x8, mmu_idx) &&
v7m_stack_read(cpu, &env->regs[4], frameptr + 0x8, mmu_idx) && v7m_stack_read(cpu, &env->regs[4], frameptr + 0x8, mmu_idx) &&
v7m_stack_read(cpu, &env->regs[5], frameptr + 0xc, mmu_idx) && v7m_stack_read(cpu, &env->regs[5], frameptr + 0xc, mmu_idx) &&