diff mbox series

[2/5] disas/hppa: implement mfdiag/mtdiag disassembly

Message ID 20250128161450.12975-3-deller@kernel.org (mailing list archive)
State New
Headers show
Series hppa 64-bit improvements | expand

Commit Message

Helge Deller Jan. 28, 2025, 4:14 p.m. UTC 
From: Helge Deller <deller@gmx.de>

The various PA-RISC CPUs implement different CPU-specific diag
instructions (mfdiag, mtdiag, mfcpu, mtcpu, ...) to access CPU-internal
diagnose/configuration registers, e.g. for cache control, managing space
register hashing, control front panel LEDs and read status of the
hardware reset button.

Those instructions are mostly undocumented, but are used by ODE, HP-UX
and Linux.

This patch adds some neccessary instructions for PCXL and PCXU CPUs.

Signed-off-by: Helge Deller <deller@gmx.de>
---
 disas/hppa.c | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

Comments

Richard Henderson Jan. 28, 2025, 4:55 p.m. UTC | #1 
On 1/28/25 08:14, deller@kernel.org wrote:
> From: Helge Deller<deller@gmx.de>
> 
> The various PA-RISC CPUs implement different CPU-specific diag
> instructions (mfdiag, mtdiag, mfcpu, mtcpu, ...) to access CPU-internal
> diagnose/configuration registers, e.g. for cache control, managing space
> register hashing, control front panel LEDs and read status of the
> hardware reset button.
> 
> Those instructions are mostly undocumented, but are used by ODE, HP-UX
> and Linux.
> 
> This patch adds some neccessary instructions for PCXL and PCXU CPUs.
> 
> Signed-off-by: Helge Deller<deller@gmx.de>
> ---
>   disas/hppa.c | 23 +++++++++++++++++++++--
>   1 file changed, 21 insertions(+), 2 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~
diff mbox series

Patch

diff --git a/disas/hppa.c b/disas/hppa.c
index 49e2231ae6..2b58434966 100644
--- a/disas/hppa.c
+++ b/disas/hppa.c
@@ -606,7 +606,7 @@  struct pa_opcode
 
    In the args field, the following characters are unused:
 
-	'  "         -  /   34 6789:;    '
+	'  "         -  /   34 678 :;    '
 	'@  C         M             [\]  '
 	'`    e g                     }  '
 
@@ -650,6 +650,7 @@  Also these:
    |	6 bit field length at 19,27:31 (fixed extract/deposit)
    A    13 bit immediate at 18 (to support the BREAK instruction)
    ^	like b, but describes a control register
+   9	like b, but describes a diagnose register
    !    sar (cr11) register
    D    26 bit immediate at 31 (to support the DIAG instruction)
    $    9 bit immediate at 28 (to support POPBTS)
@@ -1322,13 +1323,19 @@  static const struct pa_opcode pa_opcodes[] =
 { "fdce",	0x040012c0, 0xfc00ffdf, "cZx(b)", pa10, 0},
 { "fdce",	0x040012c0, 0xfc003fdf, "cZx(s,b)", pa10, 0},
 { "fice",	0x040002c0, 0xfc001fdf, "cZx(S,b)", pa10, 0},
-{ "diag",	0x14000000, 0xfc000000, "D", pa10, 0},
 { "idtlbt",	0x04001800, 0xfc00ffff, "x,b", pa20, FLAG_STRICT},
 { "iitlbt",	0x04000800, 0xfc00ffff, "x,b", pa20, FLAG_STRICT},
 
+/* completely undocumented, but used by ODE, HP-UX and Linux: */
+{ "mfcpu_pcxu",	0x140008a0, 0xfc9fffe0, "9,t", pa20, 0}, /* PCXU: mfdiag */
+{ "mtcpu_pcxu",	0x14001840, 0xfc00ffff, "x,9", pa20, 0},
+
 /* These may be specific to certain versions of the PA.  Joel claimed
    they were 72000 (7200?) specific.  However, I'm almost certain the
    mtcpu/mfcpu were undocumented, but available in the older 700 machines.  */
+{ "mfcpu_c",    0x14000600, 0xfc00ffff, "9,x", pa10, 0}, /* PCXL: for dr0 and dr8 only */
+{ "mfcpu_t",    0x14001400, 0xfc9fffe0, "9,t", pa10, 0}, /* PCXL: all dr except dr0 and dr8 */
+{ "mtcpu_pcxl",	0x14000240, 0xfc00ffff, "x,9", pa11, 0}, /* PCXL: mtcpu for dr0 and dr8 */
 { "mtcpu",	0x14001600, 0xfc00ffff, "x,^", pa10, 0},
 { "mfcpu",	0x14001A00, 0xfc00ffff, "^,x", pa10, 0},
 { "tocen",	0x14403600, 0xffffffff, "", pa10, 0},
@@ -1336,6 +1343,9 @@  static const struct pa_opcode pa_opcodes[] =
 { "shdwgr",	0x14402600, 0xffffffff, "", pa10, 0},
 { "grshdw",	0x14400620, 0xffffffff, "", pa10, 0},
 
+/* instead of showing D only, show all other registers too */
+{ "diag",	0x14000000, 0xfc000000, "D  x,9,t", pa10, 0},
+
 /* gfw and gfr are not in the HP PA 1.1 manual, but they are in either
    the Timex FPU or the Mustang ERS (not sure which) manual.  */
 { "gfw",	0x04001680, 0xfc00ffdf, "cZx(b)", pa11, 0},
@@ -1801,6 +1811,12 @@  fput_creg (unsigned reg, disassemble_info *info)
   (*info->fprintf_func) (info->stream, "%s", control_reg[reg]);
 }
 
+static void
+fput_dreg (unsigned reg, disassemble_info *info)
+{
+  (*info->fprintf_func) (info->stream, "dr%d", reg);
+}
+
 /* Print constants with sign.  */
 
 static void
@@ -2007,6 +2023,9 @@  print_insn_hppa (bfd_vma memaddr, disassemble_info *info)
 		case '^':
 		  fput_creg (GET_FIELD (insn, 6, 10), info);
 		  break;
+		case '9':
+		  fput_dreg (GET_FIELD (insn, 6, 10), info);
+		  break;
 		case 't':
 		  fput_reg (GET_FIELD (insn, 27, 31), info);
 		  break;