[Expired for QEMU because there has been no activity for 60 days.]
** Changed in: qemu
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1095531
Title:
sparc32plus (and others?) has x86 code generation errors on 64bit
hosts
Status in QEMU:
Expired
Bug description:
On 64bit hosts, the load and store functions compile improperly. The
issue is the call to gen_address_mask() under the ld and st functions
in target-sparc/translate.c. Below are some snips from the log file.
Doing a gdb debug, this results in constant access violation errors
which I do not see when debugging qemu in powerpc mode.
--------------
IN:
0x0000000040804aa8: st %i0, [ %fp + 0x44 ]
OP:
---- 0x40804aa8
ld_i64 tmp1,regwptr,$0xb0
mov_i64 tmp0,tmp1
movi_i64 tmp2,$0x44
add_i64 tmp0,tmp0,tmp2
ld_i64 tmp2,regwptr,$0x80
ext32u_i64 tmp0,tmp0
qemu_st32 tmp2,tmp0,$0x0
OUT: [size=345]
0x6032d7f0: mov 0x40(%r14),%rbp
0x6032d7f4: mov 0xb0(%rbp),%rbx
0x6032d7fb: add $0x44,%rbx
0x6032d7ff: mov 0x80(%rbp),%rbp
0x6032d806: mov %ebx,%ebx <- bug
0x6032d808: mov %ebp,%edi
0x6032d80a: bswap %edi
0x6032d80c: mov %edi,(%rbx)
--------------
IN:
0x0000000040804aec: add %l7, %o7, %l7
0x0000000040804af0: ld [ %l7 ], %g2
OP:
---- 0x40804aec
ld_i64 tmp1,regwptr,$0x78
ld_i64 tmp2,regwptr,$0x38
add_i64 tmp0,tmp1,tmp2
st_i64 tmp0,regwptr,$0x78
---- 0x40804af0
ld_i64 tmp1,regwptr,$0x78
mov_i64 tmp0,tmp1
ext32u_i64 tmp0,tmp0
qemu_ld32u g2,tmp0,$0x0
OUT: [size=395]
0x6032da80: mov 0x40(%r14),%rbp
0x6032da84: mov 0x78(%rbp),%rbx
0x6032da88: mov 0x38(%rbp),%r12
0x6032da8c: add %r12,%rbx
0x6032da8f: mov %rbx,0x78(%rbp)
0x6032da93: mov 0x78(%rbp),%rbx
0x6032da97: mov %ebx,%ebx <- bug
0x6032da99: mov (%rbx),%ebx
In 64bit mode, doing a 32bit operation will result in the top 32bit's
being zero'd. I attempted to simply disable the call to
gen_address_mask() but that did not fix the issue and actually caused
the sparc32plus I was testing to become unusable.
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