[backport][binutils][arm][4/5] Set context table for '.arch_extension'

[Mihail Ionescu]

Hi,

This is a backport for binutils 2.33.

This patch fixes .arch_extension behaviour.

Currently, context table for '.arch_extension' is only set while
"-march" processing, but it is not set while .arch processing,
so following code is rejected

  .syntax unified
  .thumb
  .arch armv8.1-m.main
  .arch_extension mve.fp

  unless -march=armv8.1-m.main is given.


gas/ChangeLog:

2020-01-17  Mihail Ionescu  <mihail.ionescu@arm.com>

	Backport from trunk
	2019-12-10  Vladimir Murzin  <vladimir.murzin@arm.com>

	* config/tc-arm.c (s_arm_arch): Set selected_ctx_ext_table.
	* testsuite/gas/arm/mve-arch-ext.s: New.
	* testsuite/gas/arm/mve-arch-ext.d: New.

Is it ok for 2.33?

Regards,
Mihail


###############     Attachment also inlined for ease of reply    ###############


diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index ec2cee3f56cfa6e639192423c59de1bbe17ae8e0..d926cb586fb31659c34bbcf73bbdf94fe8f30741 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -32254,6 +32254,7 @@ s_arm_arch (int ignored ATTRIBUTE_UNUSED)
     if (streq (opt->name, name))
       {
 	selected_arch = opt->value;
+	selected_ctx_ext_table = opt->ext_table;
 	selected_ext = arm_arch_none;
 	selected_cpu = selected_arch;
 	strcpy (selected_cpu_name, opt->name);
diff --git a/gas/testsuite/gas/arm/mve-arch-ext.d b/gas/testsuite/gas/arm/mve-arch-ext.d
new file mode 100644
index 0000000000000000000000000000000000000000..0c55b38db6e6fa46a1bd2ad92e4c32b1dc3de735
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-arch-ext.d
@@ -0,0 +1,7 @@
+# name: MVE context sensitive .arch_extension under no -march
+# objdump: -dr --prefix-addresses --show-raw-insn -marmv8.1-m.main
+
+.*: +file format .*arm.*
+
+Disassembly of section .text:
+0[0-9a-f]+ <[^>]+> ea52 136f 	asrl	r2, r3, #5
diff --git a/gas/testsuite/gas/arm/mve-arch-ext.s b/gas/testsuite/gas/arm/mve-arch-ext.s
new file mode 100644
index 0000000000000000000000000000000000000000..bbbb9ee1282c2003c9253374a280c7a52eae8466
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-arch-ext.s
@@ -0,0 +1,6 @@
+.syntax unified
+.thumb
+.arch armv8.1-m.main
+.arch_extension mve
+
+asrl	r2, r3, #5

-------------- next part --------------
diff --git a/gas/config/tc-arm.c b/gas/config/tc-arm.c
index ec2cee3f56cfa6e639192423c59de1bbe17ae8e0..d926cb586fb31659c34bbcf73bbdf94fe8f30741 100644
--- a/gas/config/tc-arm.c
+++ b/gas/config/tc-arm.c
@@ -32254,6 +32254,7 @@ s_arm_arch (int ignored ATTRIBUTE_UNUSED)
     if (streq (opt->name, name))
       {
 	selected_arch = opt->value;
+	selected_ctx_ext_table = opt->ext_table;
 	selected_ext = arm_arch_none;
 	selected_cpu = selected_arch;
 	strcpy (selected_cpu_name, opt->name);
diff --git a/gas/testsuite/gas/arm/mve-arch-ext.d b/gas/testsuite/gas/arm/mve-arch-ext.d
new file mode 100644
index 0000000000000000000000000000000000000000..0c55b38db6e6fa46a1bd2ad92e4c32b1dc3de735
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-arch-ext.d
@@ -0,0 +1,7 @@
+# name: MVE context sensitive .arch_extension under no -march
+# objdump: -dr --prefix-addresses --show-raw-insn -marmv8.1-m.main
+
+.*: +file format .*arm.*
+
+Disassembly of section .text:
+0[0-9a-f]+ <[^>]+> ea52 136f 	asrl	r2, r3, #5
diff --git a/gas/testsuite/gas/arm/mve-arch-ext.s b/gas/testsuite/gas/arm/mve-arch-ext.s
new file mode 100644
index 0000000000000000000000000000000000000000..bbbb9ee1282c2003c9253374a280c7a52eae8466
--- /dev/null
+++ b/gas/testsuite/gas/arm/mve-arch-ext.s
@@ -0,0 +1,6 @@
+.syntax unified
+.thumb
+.arch armv8.1-m.main
+.arch_extension mve
+
+asrl	r2, r3, #5