* [binutils-gdb] MIPS: make mipsisa32 and mipsisa64 link more systematic
@ 2023-04-12 12:26 Richard Sandiford
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From: Richard Sandiford @ 2023-04-12 12:26 UTC (permalink / raw)
To: bfd-cvs
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=0a12bf174dd171edf153dbdcfb82d04f53d6cfab
commit 0a12bf174dd171edf153dbdcfb82d04f53d6cfab
Author: YunQiang Su <yunqiang.su@cipunited.com>
Date: Wed Apr 12 13:25:46 2023 +0100
MIPS: make mipsisa32 and mipsisa64 link more systematic
Introduce `static const struct mips_mach_extension mips_mach_32_64[]`
and `mips_mach_extends_32_64 (unsigned long base, unsigned long extension)`,
to make mipsisa32 and mipsisa64 interlink more systemtic.
Normally, the ISA mipsisa64rN has two subset: mipsisa64r(N-1) and
mipsisa32rN. `mips_mach_extensions` can hold only mipsisa64r(N-1),
so we need to introduce a new instruction `mips_mach_32_64`, which holds the pair 32vs64.
Note: R6 is not compatible with pre-R6.
bfd/ChangeLog:
* elfxx-mips.c (mips_mach_extends_p): make mipsisa32 and
mipsisa64 interlink more systematic.
(mips_mach_32_64): new struct added.
(mips_mach_extends_32_64): new function added.
Diff:
---
bfd/elfxx-mips.c | 34 ++++++++++++++++++++++++++--------
1 file changed, 26 insertions(+), 8 deletions(-)
diff --git a/bfd/elfxx-mips.c b/bfd/elfxx-mips.c
index 751deede887..13a89953293 100644
--- a/bfd/elfxx-mips.c
+++ b/bfd/elfxx-mips.c
@@ -14524,6 +14524,16 @@ struct mips_mach_extension
unsigned long extension, base;
};
+/* An array that maps 64-bit architectures to the corresponding 32-bit
+ architectures. */
+static const struct mips_mach_extension mips_mach_32_64[] =
+{
+ { bfd_mach_mipsisa64r6, bfd_mach_mipsisa32r6 },
+ { bfd_mach_mipsisa64r5, bfd_mach_mipsisa32r5 },
+ { bfd_mach_mipsisa64r3, bfd_mach_mipsisa32r3 },
+ { bfd_mach_mipsisa64r2, bfd_mach_mipsisa32r2 },
+ { bfd_mach_mipsisa64, bfd_mach_mipsisa32 }
+};
/* An array describing how BFD machines relate to one another. The entries
are ordered topologically with MIPS I extensions listed last. */
@@ -14601,29 +14611,37 @@ static const struct mips_mach_extension mips_mach_extensions[] =
{ bfd_mach_mips3900, bfd_mach_mips3000 }
};
-/* Return true if bfd machine EXTENSION is an extension of machine BASE. */
+/* Return true if bfd machine EXTENSION is the same as BASE, or if
+ EXTENSION is the 64-bit equivalent of a 32-bit BASE. */
static bool
-mips_mach_extends_p (unsigned long base, unsigned long extension)
+mips_mach_extends_32_64 (unsigned long base, unsigned long extension)
{
size_t i;
if (extension == base)
return true;
- if (base == bfd_mach_mipsisa32
- && mips_mach_extends_p (bfd_mach_mipsisa64, extension))
- return true;
+ for (i = 0; i < ARRAY_SIZE (mips_mach_32_64); i++)
+ if (extension == mips_mach_32_64[i].extension)
+ return base == mips_mach_32_64[i].base;
+
+ return false;
+}
+
+static bool
+mips_mach_extends_p (unsigned long base, unsigned long extension)
+{
+ size_t i;
- if (base == bfd_mach_mipsisa32r2
- && mips_mach_extends_p (bfd_mach_mipsisa64r2, extension))
+ if (mips_mach_extends_32_64 (base, extension))
return true;
for (i = 0; i < ARRAY_SIZE (mips_mach_extensions); i++)
if (extension == mips_mach_extensions[i].extension)
{
extension = mips_mach_extensions[i].base;
- if (extension == base)
+ if (mips_mach_extends_32_64 (base, extension))
return true;
}
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