Patchwork [v7,03/11] target-arm: Drop CPUARMState* argument from bank_number()

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Submitter Peter Maydell
Date Feb. 26, 2013, 5:40 p.m.
Message ID <1361900421-28354-4-git-send-email-peter.maydell@linaro.org>
Download mbox | patch
Permalink /patch/223355/
State New
Headers show

Comments

Peter Maydell - Feb. 26, 2013, 5:40 p.m.
Drop the CPUARMState* argument from bank_number(), since we only
use it for passing to cpu_abort(). Use hw_error() instead.
This avoids propagating further interfaces using env pointers.

In the long term this function's callers need auditing to fix
problems where badly behaved guests can pass invalid bank numbers.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target-arm/helper.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)
Andreas Färber - March 4, 2013, 11:12 a.m.
Am 26.02.2013 18:40, schrieb Peter Maydell:
> Drop the CPUARMState* argument from bank_number(), since we only
> use it for passing to cpu_abort(). Use hw_error() instead.
> This avoids propagating further interfaces using env pointers.
> 
> In the long term this function's callers need auditing to fix
> problems where badly behaved guests can pass invalid bank numbers.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Reviewed-by: Andreas Färber <afaerber@suse.de>

Thanks,
Andreas

Patch

diff --git a/target-arm/helper.c b/target-arm/helper.c
index e97e1a5..7fa4ba0 100644
--- a/target-arm/helper.c
+++ b/target-arm/helper.c
@@ -1617,7 +1617,7 @@  uint32_t HELPER(get_r13_banked)(CPUARMState *env, uint32_t mode)
 #else
 
 /* Map CPU modes onto saved register banks.  */
-static inline int bank_number(CPUARMState *env, int mode)
+static inline int bank_number(int mode)
 {
     switch (mode) {
     case ARM_CPU_MODE_USR:
@@ -1634,8 +1634,7 @@  static inline int bank_number(CPUARMState *env, int mode)
     case ARM_CPU_MODE_FIQ:
         return 5;
     }
-    cpu_abort(env, "Bad mode %x\n", mode);
-    return -1;
+    hw_error("bank number requested for bad CPSR mode value 0x%x\n", mode);
 }
 
 void switch_mode(CPUARMState *env, int mode)
@@ -1655,12 +1654,12 @@  void switch_mode(CPUARMState *env, int mode)
         memcpy (env->regs + 8, env->fiq_regs, 5 * sizeof(uint32_t));
     }
 
-    i = bank_number(env, old_mode);
+    i = bank_number(old_mode);
     env->banked_r13[i] = env->regs[13];
     env->banked_r14[i] = env->regs[14];
     env->banked_spsr[i] = env->spsr;
 
-    i = bank_number(env, mode);
+    i = bank_number(mode);
     env->regs[13] = env->banked_r13[i];
     env->regs[14] = env->banked_r14[i];
     env->spsr = env->banked_spsr[i];
@@ -2530,7 +2529,7 @@  void HELPER(set_r13_banked)(CPUARMState *env, uint32_t mode, uint32_t val)
     if ((env->uncached_cpsr & CPSR_M) == mode) {
         env->regs[13] = val;
     } else {
-        env->banked_r13[bank_number(env, mode)] = val;
+        env->banked_r13[bank_number(mode)] = val;
     }
 }
 
@@ -2539,7 +2538,7 @@  uint32_t HELPER(get_r13_banked)(CPUARMState *env, uint32_t mode)
     if ((env->uncached_cpsr & CPSR_M) == mode) {
         return env->regs[13];
     } else {
-        return env->banked_r13[bank_number(env, mode)];
+        return env->banked_r13[bank_number(mode)];
     }
 }