aarch64: Add maximum immediate value to aarch64_sys_reg

The immediate form of MSR has a 4-bit immediate field (in CRm).
However, many forms of MSR require a smaller immediate.  These cases
are identified by value in operand_general_constraint_met_p,
but they're now the common case rather than the exception.

This patch therefore adds the maximum value to the sys_reg
description and gets the range from there.  It also enforces
the minimum of 0, which avoids a situation in which:

  msr dit, #2

would give the expected:

  Error: immediate value out of range 0 to 1

whereas:

  msr dit, #-1

would give:

  Error: immediate value out of range 0 to 15

(from the later UIMM4 checking).

Also:

- we were reporting the first error above against the wrong operand
- TCO takes a single-bit immediate, but we previously allowed
  all 16 values.
  [https://developer.arm.com/documentation/ddi0596/2021-09/Base-Instructions/MSR--immediate---Move-immediate-value-to-Special-Register-?lang=en]

opcodes/
	* aarch64-opc.h (F_REG_MAX_VALUE, F_GET_REG_MAX_VALUE): New macros.
	* aarch64-opc.c (operand_general_constraint_met_p): Read the
	maximum MSR immediate value from aarch64_pstatefields.
	(aarch64_pstatefields): Add the maximum immediate value
	for each register.

gas/
	* testsuite/gas/aarch64/sysreg-4.s: Use an immediate value of 1
	rather than 8 for the TCO test.
	* testsuite/gas/aarch64/sysreg-4.d: Update accordingly.
	* testsuite/gas/aarch64/armv8_2-a-illegal.l: Fix operand number
	in MSR immediate error messages.
	* testsuite/gas/aarch64/diagnostic.l: Likewise.
	* testsuite/gas/aarch64/pan-illegal.l: Likewise.
	* testsuite/gas/aarch64/ssbs-illegal1.l: Likewise.
	* testsuite/gas/aarch64/illegal-sysreg-4b.s,
	* testsuite/gas/aarch64/illegal-sysreg-4b.d,
	* testsuite/gas/aarch64/illegal-sysreg-4b.l: New test.

9 files changed, 66 insertions, 39 deletions

diff --git a/gas/testsuite/gas/aarch64/armv8_2-a-illegal.l b/gas/testsuite/gas/aarch64/armv8_2-a-illegal.l
index f917bf7..380ec51 100644
--- a/gas/testsuite/gas/aarch64/armv8_2-a-illegal.l
+++ b/gas/testsuite/gas/aarch64/armv8_2-a-illegal.l
@@ -1,9 +1,9 @@
 [^:]+: Assembler messages:
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#2'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#3'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#4'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#5'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#8'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#15'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#19'
-[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr uao,#31'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#2'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#3'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#4'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#5'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#8'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#15'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#19'
+[^:]+:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr uao,#31'
diff --git a/gas/testsuite/gas/aarch64/diagnostic.l b/gas/testsuite/gas/aarch64/diagnostic.l
index 5158d41..87cc4fe 100644
--- a/gas/testsuite/gas/aarch64/diagnostic.l
+++ b/gas/testsuite/gas/aarch64/diagnostic.l
@@ -15,7 +15,7 @@
 [^:]*:17: Error: extraneous register at operand 2 -- `tlbi alle3is,x0'
 [^:]*:18: Error: missing register at operand 2 -- `tlbi vaale1is'
 [^:]*:19: Error: comma expected between operands at operand 2 -- `tlbi vaale1is x0'
-[^:]*:20: Error: immediate value out of range 0 to 1 at operand 1 -- `msr spsel,3'
+[^:]*:20: Error: immediate value out of range 0 to 1 at operand 2 -- `msr spsel,3'
 [^:]*:21: Error: immediate value out of range 1 to 64 at operand 3 -- `fcvtzu x15,d31,#66'
 [^:]*:22: Error: immediate value out of range 1 to 32 at operand 3 -- `scvtf s0,w0,33'
 [^:]*:23: Error: immediate value out of range 1 to 32 at operand 3 -- `scvtf s0,w0,0'
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-4b.d b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.d
new file mode 100644
index 0000000..1504f5f
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.d
@@ -0,0 +1,2 @@
+#as: -march=armv8-a
+#error_output: illegal-sysreg-4b.l
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-4b.l b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.l
new file mode 100644
index 0000000..69987b4
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.l
@@ -0,0 +1,11 @@
+[^:]*: Assembler messages:
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr TCO,#-1'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr TCO,#2'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr TCO,#15'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr TCO,#0x100000000'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifclr,#-1'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifclr,#16'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifclr,#0x200000000'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifset,#-1'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifset,#16'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 15 at operand 2 -- `msr daifset,#0x200000000'
diff --git a/gas/testsuite/gas/aarch64/illegal-sysreg-4b.s b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.s
new file mode 100644
index 0000000..d7e8476
--- /dev/null
+++ b/gas/testsuite/gas/aarch64/illegal-sysreg-4b.s
@@ -0,0 +1,14 @@
+	.arch armv8.5-a+memtag
+
+	msr TCO, #-1
+	msr TCO, #2
+	msr TCO, #15
+	msr TCO, #0x100000000
+
+	msr daifclr, #-1
+	msr daifclr, #16
+	msr daifclr, #0x200000000
+
+	msr daifset, #-1
+	msr daifset, #16
+	msr daifset, #0x200000000
diff --git a/gas/testsuite/gas/aarch64/pan-illegal.l b/gas/testsuite/gas/aarch64/pan-illegal.l
index f620ab0..5ba76f5 100644
--- a/gas/testsuite/gas/aarch64/pan-illegal.l
+++ b/gas/testsuite/gas/aarch64/pan-illegal.l
@@ -1,15 +1,15 @@
 [^:]*: Assembler messages:
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#2'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#3'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#4'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#5'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#6'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#7'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#8'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#9'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#10'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#11'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#12'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#13'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#14'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr pan,#15'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#2'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#3'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#4'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#5'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#6'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#7'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#8'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#9'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#10'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#11'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#12'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#13'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#14'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr pan,#15'
diff --git a/gas/testsuite/gas/aarch64/ssbs-illegal1.l b/gas/testsuite/gas/aarch64/ssbs-illegal1.l
index 74a8b74..6f7c5dc 100644
--- a/gas/testsuite/gas/aarch64/ssbs-illegal1.l
+++ b/gas/testsuite/gas/aarch64/ssbs-illegal1.l
@@ -1,15 +1,15 @@
 [^:]*: Assembler messages:
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#2'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#3'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#4'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#5'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#6'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#7'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#8'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#9'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#10'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#11'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#12'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#13'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#14'
-[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 1 -- `msr ssbs,#15'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#2'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#3'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#4'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#5'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#6'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#7'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#8'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#9'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#10'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#11'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#12'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#13'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#14'
+[^:]*:[0-9]+: Error: immediate value out of range 0 to 1 at operand 2 -- `msr ssbs,#15'
diff --git a/gas/testsuite/gas/aarch64/sysreg-4.d b/gas/testsuite/gas/aarch64/sysreg-4.d
index c25536d..f0fffbe 100644
--- a/gas/testsuite/gas/aarch64/sysreg-4.d
+++ b/gas/testsuite/gas/aarch64/sysreg-4.d
@@ -38,7 +38,7 @@ Disassembly of section \.text:
 .*:	d51d560c 	msr	tfsr_el12, x12
 .*:	d51810a1 	msr	rgsr_el1, x1
 .*:	d51810c3 	msr	gcr_el1, x3
-.*:	d503489f 	msr	tco, #0x8
+.*:	d503419f 	msr	tco, #0x1
 .*:	d5087661 	dc	igvac, x1
 .*:	d5087682 	dc	igsw, x2
 .*:	d5087a83 	dc	cgsw, x3
diff --git a/gas/testsuite/gas/aarch64/sysreg-4.s b/gas/testsuite/gas/aarch64/sysreg-4.s
index ace9803..769f0a6 100644
--- a/gas/testsuite/gas/aarch64/sysreg-4.s
+++ b/gas/testsuite/gas/aarch64/sysreg-4.s
@@ -38,7 +38,7 @@ func:
 	msr gcr_el1, x3
 
 	# MSR (immediate)
-	msr TCO, #8
+	msr TCO, #1
 
 	# Data cache
 	dc igvac, x1