[src/trunk]: src/sys/arch/mips/include Add an abicalls version of asm mcount ...

[simonb <simonb%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/2192223cd7e0
branches:  trunk
changeset: 952804:2192223cd7e0
user:      simonb <simonb%NetBSD.org@localhost>
date:      Thu Feb 18 12:28:01 2021 +0000

description:
Add an abicalls version of asm mcount prologue.  XXX not tested because
profiled programs fail to link, but fixes build.  Thanks dholland@ for
help analysing this.

While here, rename _KERN_MCOUNT to _MIPS_ASM_MCOUNT - it's not kernel
specific.

diffstat:

 sys/arch/mips/include/asm.h |  29 +++++++++++++++++++++++------
 1 files changed, 23 insertions(+), 6 deletions(-)

diffs (62 lines):

diff -r b219f1c68c04 -r 2192223cd7e0 sys/arch/mips/include/asm.h
--- a/sys/arch/mips/include/asm.h       Thu Feb 18 11:23:15 2021 +0000
+++ b/sys/arch/mips/include/asm.h       Thu Feb 18 12:28:01 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: asm.h,v 1.64 2021/02/16 06:06:58 simonb Exp $  */
+/*     $NetBSD: asm.h,v 1.65 2021/02/18 12:28:01 simonb Exp $  */
 
 /*
  * Copyright (c) 1992, 1993
@@ -76,9 +76,9 @@
 /*
  * 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.
+ * _MIPS_ASM_MCOUNT.
  */
-#define        _KERN_MCOUNT                                            \
+#define        _MIPS_ASM_MCOUNT                                        \
        .set    push;                                           \
        .set    noreorder;                                      \
        .set    noat;                                           \
@@ -98,9 +98,25 @@
 #else                          /* New (n32/n64) ABI */
 /*
  * The new ABI version just needs to put the return address in AT and
- * call _mcount().
+ * call _mcount().  For the no abicalls case, skip the reloc dance.
  */
-#define        _KERN_MCOUNT                                            \
+#ifdef __mips_abicalls
+#define        _MIPS_ASM_MCOUNT                                        \
+       .set    push;                                           \
+       .set    noreorder;                                      \
+       .set    noat;                                           \
+       subu    sp,16;                                          \
+       sw      t9,8(sp);                                       \
+       move    AT,ra;                                          \
+       lui     t9,%hi(_mcount);                                \
+       addiu   t9,t9,%lo(_mcount);                             \
+       jalr    t9;                                             \
+        nop;                                                   \
+       lw      t9,8(sp);                                       \
+       addiu   sp,16;                                          \
+       .set    pop;
+#else /* !__mips_abicalls */
+#define        _MIPS_ASM_MCOUNT                                        \
        .set    push;                                           \
        .set    noreorder;                                      \
        .set    noat;                                           \
@@ -108,10 +124,11 @@
        jal     _mcount;                                        \
         nop;                                                   \
        .set    pop;
+#endif /* !__mips_abicalls */
 #endif /* n32/n64 */
 
 #ifdef GPROF
-#define        MCOUNT _KERN_MCOUNT
+#define        MCOUNT _MIPS_ASM_MCOUNT
 #else
 #define        MCOUNT
 #endif