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Re: [PATCH v2 15/55] target/sparc: Remove DEBUG_UNALIGNED


From: Mark Cave-Ayland
Subject: Re: [PATCH v2 15/55] target/sparc: Remove DEBUG_UNALIGNED
Date: Wed, 18 Aug 2021 09:36:44 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 03/08/2021 05:14, Richard Henderson wrote:

The printf should have been qemu_log_mask, the parameters
themselves no longer compile, and because this is placed
before unwinding the PC is actively wrong.

We get better (and correct) logging on the other side of
raising the exception, in sparc_cpu_do_interrupt.

Cc: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
  target/sparc/ldst_helper.c | 9 ---------
  1 file changed, 9 deletions(-)

diff --git a/target/sparc/ldst_helper.c b/target/sparc/ldst_helper.c
index 22327d7d72..974afea041 100644
--- a/target/sparc/ldst_helper.c
+++ b/target/sparc/ldst_helper.c
@@ -27,7 +27,6 @@
//#define DEBUG_MMU
  //#define DEBUG_MXCC
-//#define DEBUG_UNALIGNED
  //#define DEBUG_UNASSIGNED
  //#define DEBUG_ASI
  //#define DEBUG_CACHE_CONTROL
@@ -364,10 +363,6 @@ static void do_check_align(CPUSPARCState *env, 
target_ulong addr,
                             uint32_t align, uintptr_t ra)
  {
      if (addr & align) {
-#ifdef DEBUG_UNALIGNED
-        printf("Unaligned access to 0x" TARGET_FMT_lx " from 0x" TARGET_FMT_lx
-               "\n", addr, env->pc);
-#endif
          cpu_raise_exception_ra(env, TT_UNALIGNED, ra);
      }
  }
@@ -1968,10 +1963,6 @@ void QEMU_NORETURN 
sparc_cpu_do_unaligned_access(CPUState *cs, vaddr addr,
      SPARCCPU *cpu = SPARC_CPU(cs);
      CPUSPARCState *env = &cpu->env;
-#ifdef DEBUG_UNALIGNED
-    printf("Unaligned access to 0x" TARGET_FMT_lx " from 0x" TARGET_FMT_lx
-           "\n", addr, env->pc);
-#endif
      cpu_raise_exception_ra(env, TT_UNALIGNED, retaddr);
  }
  #endif

Indeed. I suspect that this was originally intended for developers to capture that an unaligned access occurred rather than processing it correctly.

Reviewed-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>


ATB,

Mark.



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