[PULL 0/2] target-arm queue

[PULL 0/2] target-arm queue

[Peter Maydell]

Couple of last-minute things for rc3...

-- PMM

The following changes since commit d15532d91be177e7528310e0110e39f915779a99:

  Merge remote-tracking branch 'remotes/aperard/tags/pull-xen-20200804' into staging (2020-08-04 11:53:20 +0100)

are available in the Git repository at:

  https://git.linaro.org/people/pmaydell/qemu-arm.git tags/pull-target-arm-20200804

for you to fetch changes up to d250bb19ced3b702c7c37731855f6876d0cc7995:

  target/arm: Fix decode of LDRA[AB] instructions (2020-08-04 16:40:19 +0100)

----------------------------------------------------------------
target-arm queue:
 * Fix decode of LDRA[AB] instructions
 * docs/devel: Document decodetree no-overlap groups

----------------------------------------------------------------
Peter Collingbourne (1):
      target/arm: Fix decode of LDRA[AB] instructions

Richard Henderson (1):
      docs/devel: Document decodetree no-overlap groups

 docs/devel/decodetree.rst  | 29 ++++++++++++++++++-----------
 target/arm/translate-a64.c |  6 ++++--
 2 files changed, 22 insertions(+), 13 deletions(-)

[PULL 1/2] docs/devel: Document decodetree no-overlap groups

[Peter Maydell]

From: Richard Henderson <richard.henderson@linaro.org>

When support for this feature went in, the update to the
documentation was forgotten.

Fixes: 067e8b0f45d6
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20200803205708.315829-1-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 docs/devel/decodetree.rst | 29 ++++++++++++++++++-----------
 1 file changed, 18 insertions(+), 11 deletions(-)

diff --git a/docs/devel/decodetree.rst b/docs/devel/decodetree.rst
index ce7f52308ff..74f66bf46e2 100644
--- a/docs/devel/decodetree.rst
+++ b/docs/devel/decodetree.rst
@@ -173,18 +173,25 @@ Pattern Groups
 
 Syntax::
 
-  group    := '{' ( pat_def | group )+ '}'
+  group            := overlap_group | no_overlap_group
+  overlap_group    := '{' ( pat_def | group )+ '}'
+  no_overlap_group := '[' ( pat_def | group )+ ']'
 
-A *group* begins with a lone open-brace, with all subsequent lines
-indented two spaces, and ending with a lone close-brace.  Groups
-may be nested, increasing the required indentation of the lines
-within the nested group to two spaces per nesting level.
+A *group* begins with a lone open-brace or open-bracket, with all
+subsequent lines indented two spaces, and ending with a lone
+close-brace or close-bracket.  Groups may be nested, increasing the
+required indentation of the lines within the nested group to two
+spaces per nesting level.
 
-Unlike ungrouped patterns, grouped patterns are allowed to overlap.
-Conflicts are resolved by selecting the patterns in order.  If all
-of the fixedbits for a pattern match, its translate function will
-be called.  If the translate function returns false, then subsequent
-patterns within the group will be matched.
+Patterns within overlap groups are allowed to overlap.  Conflicts are
+resolved by selecting the patterns in order.  If all of the fixedbits
+for a pattern match, its translate function will be called.  If the
+translate function returns false, then subsequent patterns within the
+group will be matched.
+
+Patterns within no-overlap groups are not allowed to overlap, just
+the same as ungrouped patterns.  Thus no-overlap groups are intended
+to be nested inside overlap groups.
 
 The following example from PA-RISC shows specialization of the *or*
 instruction::
@@ -200,7 +207,7 @@ instruction::
 When the *cf* field is zero, the instruction has no side effects,
 and may be specialized.  When the *rt* field is zero, the output
 is discarded and so the instruction has no effect.  When the *rt2*
-field is zero, the operation is ``reg[rt] | 0`` and so encodes
+field is zero, the operation is ``reg[r1] | 0`` and so encodes
 the canonical register copy operation.
 
 The output from the generator might look like::
-- 
2.20.1

[PULL 2/2] target/arm: Fix decode of LDRA[AB] instructions

[Peter Maydell]

From: Peter Collingbourne <pcc@google.com>

These instructions use zero as the discriminator, not SP.

Signed-off-by: Peter Collingbourne <pcc@google.com>
Message-id: 20200804002849.30268-1-pcc@google.com
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 target/arm/translate-a64.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/arm/translate-a64.c b/target/arm/translate-a64.c
index c98dfb17a83..534c3ff5f37 100644
--- a/target/arm/translate-a64.c
+++ b/target/arm/translate-a64.c
@@ -3429,9 +3429,11 @@ static void disas_ldst_pac(DisasContext *s, uint32_t insn,
 
     if (s->pauth_active) {
         if (use_key_a) {
-            gen_helper_autda(dirty_addr, cpu_env, dirty_addr, cpu_X[31]);
+            gen_helper_autda(dirty_addr, cpu_env, dirty_addr,
+                             new_tmp_a64_zero(s));
         } else {
-            gen_helper_autdb(dirty_addr, cpu_env, dirty_addr, cpu_X[31]);
+            gen_helper_autdb(dirty_addr, cpu_env, dirty_addr,
+                             new_tmp_a64_zero(s));
         }
     }
 
-- 
2.20.1

Re: [PULL 0/2] target-arm queue

[Peter Maydell]

On Tue, 4 Aug 2020 at 17:08, Peter Maydell <peter.maydell@linaro.org> wrote:
>
> Couple of last-minute things for rc3...
>
> -- PMM
>
> The following changes since commit d15532d91be177e7528310e0110e39f915779a99:
>
>   Merge remote-tracking branch 'remotes/aperard/tags/pull-xen-20200804' into staging (2020-08-04 11:53:20 +0100)
>
> are available in the Git repository at:
>
>   https://git.linaro.org/people/pmaydell/qemu-arm.git tags/pull-target-arm-20200804
>
> for you to fetch changes up to d250bb19ced3b702c7c37731855f6876d0cc7995:
>
>   target/arm: Fix decode of LDRA[AB] instructions (2020-08-04 16:40:19 +0100)
>
> ----------------------------------------------------------------
> target-arm queue:
>  * Fix decode of LDRA[AB] instructions
>  * docs/devel: Document decodetree no-overlap groups
>


Applied, thanks.

Please update the changelog at https://wiki.qemu.org/ChangeLog/5.1
for any user-visible changes.

-- PMM