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[src/trunk]: src/sys/arch/mips Working kernel profiling for n32/n64:
details: https://anonhg.NetBSD.org/src/rev/835c24d9b92d
branches: trunk
changeset: 959500:835c24d9b92d
user: simonb <simonb%NetBSD.org@localhost>
date: Tue Feb 16 06:06:58 2021 +0000
description:
Working kernel profiling for n32/n64:
- Different MCOUNT and _KERN_MCOUNT macros for n32/n64.
- Don't profile mipsXX_lwp_trampoline().
- Allow a few new instructions in the stub fixups.
diffstat:
sys/arch/mips/include/asm.h | 39 ++++++++++++--
sys/arch/mips/include/profile.h | 103 +++++++++++++++++++++++++++++----------
sys/arch/mips/mips/mipsX_subr.S | 8 +-
sys/arch/mips/mips/mips_fixup.c | 39 ++++++++++++++-
4 files changed, 149 insertions(+), 40 deletions(-)
diffs (truncated from 307 to 300 lines):
diff -r f14961d1d705 -r 835c24d9b92d sys/arch/mips/include/asm.h
--- a/sys/arch/mips/include/asm.h Tue Feb 16 05:44:13 2021 +0000
+++ b/sys/arch/mips/include/asm.h Tue Feb 16 06:06:58 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: asm.h,v 1.63 2021/02/04 08:51:42 skrll Exp $ */
+/* $NetBSD: asm.h,v 1.64 2021/02/16 06:06:58 simonb Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -57,6 +57,10 @@
#include <sys/cdefs.h> /* for API selection */
#include <mips/regdef.h>
+#if defined(_KERNEL_OPT)
+#include "opt_gprof.h"
+#endif
+
#define __BIT(n) (1 << (n))
#define __BITS(hi,lo) ((~((~0)<<((hi)+1)))&((~0)<<(lo)))
@@ -66,24 +70,45 @@
/*
* Define -pg profile entry code.
- * Must always be noreorder, must never use a macro instruction
- * Final addiu to t9 must always equal the size of this _KERN_MCOUNT
+ * Must always be noreorder, must never use a macro instruction.
+ */
+#if defined(__mips_o32) /* Old 32-bit ABI */
+/*
+ * The old ABI version must also decrement two less words off the
+ * stack and the final addiu to t9 must always equal the size of this
+ * _KERN_MCOUNT.
*/
#define _KERN_MCOUNT \
.set push; \
.set noreorder; \
.set noat; \
- subu sp,sp,16; \
+ subu sp,16; \
sw t9,12(sp); \
move AT,ra; \
lui t9,%hi(_mcount); \
addiu t9,t9,%lo(_mcount); \
jalr t9; \
- nop; \
+ nop; \
lw t9,4(sp); \
- addiu sp,sp,8; \
- addiu t9,t9,40; \
+ addiu sp,8; \
+ addiu t9,40; \
.set pop;
+#elif defined(__mips_o64) /* Old 64-bit ABI */
+# error yeahnah
+#else /* New (n32/n64) ABI */
+/*
+ * The new ABI version just needs to put the return address in AT and
+ * call _mcount().
+ */
+#define _KERN_MCOUNT \
+ .set push; \
+ .set noreorder; \
+ .set noat; \
+ move AT,ra; \
+ jal _mcount; \
+ nop; \
+ .set pop;
+#endif /* n32/n64 */
#ifdef GPROF
#define MCOUNT _KERN_MCOUNT
diff -r f14961d1d705 -r 835c24d9b92d sys/arch/mips/include/profile.h
--- a/sys/arch/mips/include/profile.h Tue Feb 16 05:44:13 2021 +0000
+++ b/sys/arch/mips/include/profile.h Tue Feb 16 06:06:58 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: profile.h,v 1.22 2020/07/26 08:08:41 simonb Exp $ */
+/* $NetBSD: profile.h,v 1.23 2021/02/16 06:06:58 simonb Exp $ */
/*
* Copyright (c) 1992, 1993
@@ -37,6 +37,10 @@
#ifndef _MIPS_PROFILE_H_
#define _MIPS_PROFILE_H_
+#if defined(_KERNEL_OPT)
+#include "opt_gprof.h"
+#endif
+
#ifdef _KERNEL
/*
* Declare non-profiled _splhigh() /_splx() entrypoints for _mcount.
@@ -61,35 +65,78 @@
_KERNEL_MCOUNT_DECL \
void __attribute__((unused)) __mcount
+#ifdef __mips_o32 /* 32-bit version */
+#define MCOUNT \
+ __asm(".globl _mcount;" \
+ ".type _mcount,@function;" \
+ "_mcount:;" \
+ ".set noreorder;" \
+ ".set noat;" \
+ _PROF_CPLOAD \
+ "addu $29,$29,-16;" \
+ "sw $4,8($29);" \
+ "sw $5,12($29);" \
+ "sw $6,16($29);" \
+ "sw $7,20($29);" \
+ "sw $1,0($29);" \
+ "sw $31,4($29);" \
+ "move $5,$31;" \
+ "move $4,$1;" \
+ "jal __mcount;" \
+ " nop;" \
+ "lw $4,8($29);" \
+ "lw $5,12($29);" \
+ "lw $6,16($29);" \
+ "lw $7,20($29);" \
+ "lw $31,4($29);" \
+ "lw $1,0($29);" \
+ "addu $29,$29,24;" \
+ "j $31;" \
+ " move $31,$1;" \
+ ".set reorder;" \
+ ".set at");
+#else /* 64-bit */
+#ifdef __mips_o64
+# error yeahnah
+#endif
#define MCOUNT \
__asm(".globl _mcount;" \
- ".type _mcount,@function;" \
- "_mcount:;" \
- ".set noreorder;" \
- ".set noat;" \
- _PROF_CPLOAD \
- "addu $29,$29,-16;" \
- "sw $4,8($29);" \
- "sw $5,12($29);" \
- "sw $6,16($29);" \
- "sw $7,20($29);" \
- "sw $1,0($29);" \
- "sw $31,4($29);" \
- "move $5,$31;" \
- "move $4,$1;" \
- "jal __mcount;" \
- "nop;" \
- "lw $4,8($29);" \
- "lw $5,12($29);" \
- "lw $6,16($29);" \
- "lw $7,20($29);" \
- "lw $31,4($29);" \
- "lw $1,0($29);" \
- "addu $29,$29,24;" \
- "j $31;" \
- "move $31,$1;" \
- ".set reorder;" \
- ".set at");
+ ".type _mcount,@function;" \
+ "_mcount:;" \
+ ".set noreorder;" \
+ ".set noat;" \
+ _PROF_CPLOAD \
+ "daddu $29,$29,-80;"\
+ "sd $4,16($29);" \
+ "sd $5,24($29);" \
+ "sd $6,32($29);" \
+ "sd $7,40($29);" \
+ "sd $8,48($29);" \
+ "sd $9,56($29);" \
+ "sd $10,64($29);" \
+ "sd $11,72($29);" \
+ "sd $1,0($29);" \
+ "sd $31,8($29);" \
+ "move $5,$31;" \
+ "move $4,$1;" \
+ "jal __mcount;" \
+ " nop;" \
+ "ld $4,16($29);" \
+ "ld $5,24($29);" \
+ "ld $6,32($29);" \
+ "ld $7,40($29);" \
+ "ld $8,48($29);" \
+ "ld $9,56($29);" \
+ "ld $10,64($29);" \
+ "ld $11,72($29);" \
+ "ld $31,8($29);" \
+ "ld $1,0($29);" \
+ "daddu $29,$29,80;" \
+ "j $31;" \
+ " move $31,$1;" \
+ ".set reorder;" \
+ ".set at");
+#endif /* 64-bit */
#ifdef _KERNEL
/*
diff -r f14961d1d705 -r 835c24d9b92d sys/arch/mips/mips/mipsX_subr.S
--- a/sys/arch/mips/mips/mipsX_subr.S Tue Feb 16 05:44:13 2021 +0000
+++ b/sys/arch/mips/mips/mipsX_subr.S Tue Feb 16 06:06:58 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: mipsX_subr.S,v 1.112 2020/09/27 10:35:57 mrg Exp $ */
+/* $NetBSD: mipsX_subr.S,v 1.113 2021/02/16 06:06:58 simonb Exp $ */
/*
* Copyright 2002 Wasabi Systems, Inc.
@@ -117,7 +117,7 @@
*/
#include <mips/asm.h>
-RCSID("$NetBSD: mipsX_subr.S,v 1.112 2020/09/27 10:35:57 mrg Exp $")
+RCSID("$NetBSD: mipsX_subr.S,v 1.113 2021/02/16 06:06:58 simonb Exp $")
#include "opt_cputype.h"
#include "opt_ddb.h"
@@ -2627,8 +2627,10 @@
* Arrange for a function to be invoked neatly, after a cpu_switch().
* Call the service function with one argument, specified by the s0
* and s1 respectively. There is no need register save operation.
+ * XXX - Not profiled because we pass an arg in with v0 which isn't
+ * preserved by _mcount()
*/
-LEAF(MIPSX(lwp_trampoline))
+LEAF_NOPROFILE(MIPSX(lwp_trampoline))
PTR_ADDU sp, -CALLFRAME_SIZ
# Call lwp_startup(), with args from cpu_switchto()/cpu_lwp_fork()
diff -r f14961d1d705 -r 835c24d9b92d sys/arch/mips/mips/mips_fixup.c
--- a/sys/arch/mips/mips/mips_fixup.c Tue Feb 16 05:44:13 2021 +0000
+++ b/sys/arch/mips/mips/mips_fixup.c Tue Feb 16 06:06:58 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: mips_fixup.c,v 1.20 2019/04/06 03:06:26 thorpej Exp $ */
+/* $NetBSD: mips_fixup.c,v 1.21 2021/02/16 06:06:58 simonb Exp $ */
/*-
* Copyright (c) 2010 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: mips_fixup.c,v 1.20 2019/04/06 03:06:26 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: mips_fixup.c,v 1.21 2021/02/16 06:06:58 simonb Exp $");
#include "opt_mips3_wired.h"
#include "opt_multiprocessor.h"
@@ -286,11 +286,25 @@
* dmtc0 at, $22
* jr t9
* nop
+ *
+ * A profiled n32/n64 stub will start with:
+ * move ta, ra
+ * jal _mcount
+ * nop
*/
mips_reg_t regs[32];
uint32_t used = 1 |__BIT(_R_A0)|__BIT(_R_A1)|__BIT(_R_A2)|__BIT(_R_A3);
size_t n;
const char *errstr = "mips";
+
+#ifdef GPROF
+ static uint32_t mcount_addr = 0;
+ extern void _mcount(u_long, u_long); /* XXX decl */
+
+ if (mcount_addr == 0)
+ mcount_addr = (uint32_t)(uintptr_t)_mcount & 0x0fffffff;
+#endif /* GPROF */
+
/*
* This is basically a small MIPS emulator for those instructions
* that might be in a stub routine.
@@ -361,6 +375,14 @@
goto out;
}
break;
+#ifdef GPROF
+ case OP_JAL:
+ if (insn.JType.target << 2 != mcount_addr) {
+ errstr = "JAL-non-_mcount";
+ goto out;
+ }
+ break;
+#endif /* GPROF */
case OP_SPECIAL:
switch (insn.RType.func) {
case OP_JALR:
@@ -404,6 +426,19 @@
goto out;
}
break;
+#ifdef GPROF
+ case OP_OR:
+ if (insn.RType.rt != 0) {
+ errstr = "NON-MOVE OR";
+ goto out;
+ }
+ if (insn.RType.rd != 1 ||
+ insn.RType.rs != 31) {
+ errstr = "NON at,ra MOVE";
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