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target-mips: fix EXTPDP and setting up pos field in the DSPControl reg

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This change makes sure that modifications of pos field in the DSPControl
register do not trash other bits in the register. This bug can be triggered
with the additional test case in mips32-dsp/extpdp.c in this commit.

In addition to this, this change corrects incorrect calculation of the mask
for EXTPDP.

Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
This commit is contained in:
Petar Jovanovic 2013-05-18 03:53:41 +02:00 • committed by Aurelien Jarno
parent 489ed4bbae
commit 0ba365f4a9
2 changed files with 23 additions and 5 deletions
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18
tests/tcg/mips/mips32-dsp/extpdp.c
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@ -42,5 +42,23 @@ int main()
efi = (dsp >> 14) & 0x01;
assert(efi == 1);
ach = 0;
acl = 0;
dsp = 0;
result = 0;
__asm
("wrdsp %1\n\t"
"mthi %2, $ac1\n\t"
"mtlo %3, $ac1\n\t"
"extpdp %0, $ac1, 0x00\n\t"
"rddsp %1\n\t"
: "=r"(rt), "+r"(dsp)
: "r"(ach), "r"(acl)
);
assert(dsp == 0x3F);
assert(result == rt);
return 0;
}