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PPC: Implement and use mcrxr emulation by default

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* lib/jit_ppc-cpu.c: Add mcrxr instruction emulation,
	as this instruction has been phased out, and should be
	implemented as a kernel trap.
This commit is contained in:
Paulo Andrade 2014-12-26 15:41:12 -02:00
parent 5eb3c3602f
commit a16adad0fd
2 changed files with 60 additions and 1 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2014-12-26 Paulo Andrade <pcpa@gnu.org>
* lib/jit_ppc-cpu.c: Add mcrxr instruction emulation,
as this instruction has been phased out, and should be
implemented as a kernel trap.
2014-12-26 Paulo Andrade <pcpa@gnu.org>
* lib/jit_arm.c: Better check for need to flush constants

55
lib/jit_ppc-cpu.c
View file

@ -270,7 +270,42 @@ static void _FXS(jit_state_t*,int,int,int,int,int,int,int);
# define LD(d,a,s) FDs(58,d,a,s)
# define LDX(d,a,b) FX(31,d,a,b,21)
# define MCRF(d,s) FXL(19,d<<2,(s)<<2,0)
# define MCRXR(d) FX(31,d<<2,0,0,512)
# if DEBUG
/* In case instruction is emulated, check the kernel can handle it.
Will only generate it if DEBUG is enabled.
"""
Chapter 6. Optional Facilities and Instructions that are being
Phased Out of the Architecture
...
6.1 Move To Condition Register from XER
The mcrxr instruction is being phased out of the archi-
tecture. Its description is included here as an aid to
constructing operating system code to emulate it.
Move to Condition Register from XER
X-form
mcrxr BF
31 BF // /// /// 512 /
0 6 9 11 16 21 31
CR(4xBF:4xBF+3) <- XER(32:35)
XER(32:35) <- 0b0000
The contents of XER(32:35) are copied to Condition Reg-
ister field BF. XER(32:35) are set to zero.
Special Registers Altered:
CR field BF XER(32:35)
Programming Note
Warning: This instruction has been phased out of
the architecture. Attempting to execute this
instruction will cause the system illegal instruction
error handler to be invoked
"""
*/
# define MCRXR(d) FX(31,d<<2,0,0,512)
# else
# define MCRXR(cr) _MCRXR(_jit,cr);
static void _MCRXR(jit_state_t*, jit_int32_t);
# endif
# define MFCR(d) FX(31,d,0,0,19)
# define MFMSR(d) FX(31,d,0,0,83)
# define MFSPR(d,s) FXFX(31,d,s<<5,339)
@ -994,6 +1029,24 @@ _FXS(jit_state_t *_jit, int o, int s, int a, int h, int x, int i, int r)
}
#endif
#if !DEBUG
/*
* Use the sequence commented at
* http://tenfourfox.blogspot.com/2011/04/attention-g5-owners-your-javascript-no.html
*/
static void
_MCRXR(jit_state_t *_jit, jit_int32_t cr)
{
jit_int32_t reg;
reg = jit_get_reg(jit_class_gpr|jit_class_nospill);
MFXER(rn(reg));
MTCRF(128, rn(reg));
RLWINM(rn(reg), rn(reg), 0, 0, 28);
MTXER(rn(reg));
jit_unget_reg(reg);
}
#endif
static void
_nop(jit_state_t *_jit, jit_int32_t i0)
{