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Hexagon: add support for new v4+ registers
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Add support for a couple new v4+ registers, along with
newer save/restore pt_regs.

Signed-off-by: Richard Kuo <rkuo@codeaurora.org>
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Richard Kuo committed May 1, 2013
1 parent 444dd74 commit 60c4ba9
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Showing 8 changed files with 206 additions and 48 deletions.
11 changes: 9 additions & 2 deletions arch/hexagon/include/uapi/asm/registers.h
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Original file line number Diff line number Diff line change
Expand Up @@ -57,10 +57,17 @@ struct pt_regs {
};
union {
struct {
unsigned long gp;
unsigned long ugp;
unsigned long gp;
};
long long int gpugp;
};
union {
struct {
unsigned long cs0;
unsigned long cs1;
};
long long int ugpgp;
long long int cs1cs0;
};
/*
* Be extremely careful with rearranging these, if at all. Some code
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6 changes: 6 additions & 0 deletions arch/hexagon/include/uapi/asm/user.h
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Original file line number Diff line number Diff line change
Expand Up @@ -55,9 +55,15 @@ struct user_regs_struct {
unsigned long pc;
unsigned long cause;
unsigned long badva;
#if CONFIG_HEXAGON_ARCH_VERSION < 4
unsigned long pad1; /* pad out to 48 words total */
unsigned long pad2; /* pad out to 48 words total */
unsigned long pad3; /* pad out to 48 words total */
#else
unsigned long cs0;
unsigned long cs1;
unsigned long pad1; /* pad out to 48 words total */
#endif
};

#endif
3 changes: 2 additions & 1 deletion arch/hexagon/kernel/asm-offsets.c
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Expand Up @@ -44,7 +44,8 @@ int main(void)

COMMENT("Hexagon pt_regs definitions");
OFFSET(_PT_SYSCALL_NR, pt_regs, syscall_nr);
OFFSET(_PT_UGPGP, pt_regs, ugpgp);
OFFSET(_PT_GPUGP, pt_regs, gpugp);
OFFSET(_PT_CS1CS0, pt_regs, cs1cs0);
OFFSET(_PT_R3130, pt_regs, r3130);
OFFSET(_PT_R2928, pt_regs, r2928);
OFFSET(_PT_R2726, pt_regs, r2726);
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2 changes: 2 additions & 0 deletions arch/hexagon/kernel/kgdb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,8 @@ struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = {
{ "lc1", GDB_SIZEOF_REG, offsetof(struct pt_regs, lc1)},
{ " gp", GDB_SIZEOF_REG, offsetof(struct pt_regs, gp)},
{ "ugp", GDB_SIZEOF_REG, offsetof(struct pt_regs, ugp)},
{ "cs0", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs0)},
{ "cs1", GDB_SIZEOF_REG, offsetof(struct pt_regs, cs1)},
{ "psp", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmpsp)},
{ "elr", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmel)},
{ "est", GDB_SIZEOF_REG, offsetof(struct pt_regs, hvmer.vmest)},
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9 changes: 9 additions & 0 deletions arch/hexagon/kernel/ptrace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,10 @@ static int genregs_get(struct task_struct *target,
dummy = pt_cause(regs);
ONEXT(&dummy, cause);
ONEXT(&pt_badva(regs), badva);
#if CONFIG_HEXAGON_ARCH_VERSION >=4
ONEXT(&regs->cs0, cs0);
ONEXT(&regs->cs1, cs1);
#endif

/* Pad the rest with zeros, if needed */
if (!ret)
Expand Down Expand Up @@ -123,6 +127,11 @@ static int genregs_set(struct task_struct *target,
INEXT(&bucket, cause);
INEXT(&bucket, badva);

#if CONFIG_HEXAGON_ARCH_VERSION >=4
INEXT(&regs->cs0, cs0);
INEXT(&regs->cs1, cs1);
#endif

/* Ignore the rest, if needed */
if (!ret)
ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
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10 changes: 8 additions & 2 deletions arch/hexagon/kernel/signal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -66,7 +66,10 @@ static int setup_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
err |= __put_user(regs->preds, &sc->sc_regs.p3_0);
err |= __put_user(regs->gp, &sc->sc_regs.gp);
err |= __put_user(regs->ugp, &sc->sc_regs.ugp);

#if CONFIG_HEXAGON_ARCH_VERSION >= 4
err |= __put_user(regs->cs0, &sc->sc_regs.cs0);
err |= __put_user(regs->cs1, &sc->sc_regs.cs1);
#endif
tmp = pt_elr(regs); err |= __put_user(tmp, &sc->sc_regs.pc);
tmp = pt_cause(regs); err |= __put_user(tmp, &sc->sc_regs.cause);
tmp = pt_badva(regs); err |= __put_user(tmp, &sc->sc_regs.badva);
Expand All @@ -93,7 +96,10 @@ static int restore_sigcontext(struct pt_regs *regs,
err |= __get_user(regs->preds, &sc->sc_regs.p3_0);
err |= __get_user(regs->gp, &sc->sc_regs.gp);
err |= __get_user(regs->ugp, &sc->sc_regs.ugp);

#if CONFIG_HEXAGON_ARCH_VERSION >= 4
err |= __get_user(regs->cs0, &sc->sc_regs.cs0);
err |= __get_user(regs->cs1, &sc->sc_regs.cs1);
#endif
err |= __get_user(tmp, &sc->sc_regs.pc); pt_set_elr(regs, tmp);

return err;
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211 changes: 168 additions & 43 deletions arch/hexagon/kernel/vm_entry.S
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Original file line number Diff line number Diff line change
Expand Up @@ -45,55 +45,96 @@
* number in the case where we decode a system call (trap0(#1)).
*/

#if CONFIG_HEXAGON_ARCH_VERSION < 4
#define save_pt_regs()\
memd(R0 + #_PT_R3130) = R31:30; \
memd(R0 + #_PT_R3130) = R31:30; \
{ memw(R0 + #_PT_R2928) = R28; \
R31 = memw(R0 + #_PT_ER_VMPSP); }\
{ memw(R0 + #(_PT_R2928 + 4)) = R31; \
R31 = ugp; } \
{ memd(R0 + #_PT_R2726) = R27:26; \
R30 = gp ; } \
memd(R0 + #_PT_R2524) = R25:24; \
memd(R0 + #_PT_R2322) = R23:22; \
memd(R0 + #_PT_R2120) = R21:20; \
memd(R0 + #_PT_R1918) = R19:18; \
memd(R0 + #_PT_R1716) = R17:16; \
memd(R0 + #_PT_R1514) = R15:14; \
memd(R0 + #_PT_R1312) = R13:12; \
{ memd(R0 + #_PT_R1110) = R11:10; \
R15 = lc0; } \
{ memd(R0 + #_PT_R0908) = R9:8; \
R14 = sa0; } \
{ memd(R0 + #_PT_R0706) = R7:6; \
R13 = lc1; } \
{ memd(R0 + #_PT_R0504) = R5:4; \
R12 = sa1; } \
{ memd(R0 + #_PT_GPUGP) = R31:30; \
R11 = m1; \
R2.H = #HI(_THREAD_SIZE); } \
{ memd(R0 + #_PT_LC0SA0) = R15:14; \
R10 = m0; \
R2.L = #LO(_THREAD_SIZE); } \
{ memd(R0 + #_PT_LC1SA1) = R13:12; \
R15 = p3:0; \
R2 = neg(R2); } \
{ memd(R0 + #_PT_M1M0) = R11:10; \
R14 = usr; \
R2 = and(R0,R2); } \
{ memd(R0 + #_PT_PREDSUSR) = R15:14; \
THREADINFO_REG = R2; } \
{ r24 = memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS); \
memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R0; \
R2 = #-1; } \
{ memw(R0 + #_PT_SYSCALL_NR) = R2; \
R30 = #0; }
#else
/* V4+ */
/* the # ## # syntax inserts a literal ## */
#define save_pt_regs()\
{ memd(R0 + #_PT_R3130) = R31:30; \
R30 = memw(R0 + #_PT_ER_VMPSP); }\
{ memw(R0 + #_PT_R2928) = R28; \
R31 = memw(R0 + #_PT_ER_VMPSP); }\
{ memw(R0 + #(_PT_R2928 + 4)) = R31; \
R31 = ugp; } \
{ memd(R0 + #_PT_R2726) = R27:26; \
R30 = gp ; } \
memd(R0 + #_PT_R2524) = R25:24; \
memd(R0 + #_PT_R2322) = R23:22; \
memd(R0 + #_PT_R2120) = R21:20; \
memd(R0 + #_PT_R1918) = R19:18; \
memd(R0 + #_PT_R1716) = R17:16; \
memd(R0 + #_PT_R1514) = R15:14; \
memd(R0 + #_PT_R1312) = R13:12; \
memw(R0 + #(_PT_R2928 + 4)) = R30; }\
{ R31:30 = C11:10; \
memd(R0 + #_PT_R2726) = R27:26; \
memd(R0 + #_PT_R2524) = R25:24; }\
{ memd(R0 + #_PT_R2322) = R23:22; \
memd(R0 + #_PT_R2120) = R21:20; }\
{ memd(R0 + #_PT_R1918) = R19:18; \
memd(R0 + #_PT_R1716) = R17:16; }\
{ memd(R0 + #_PT_R1514) = R15:14; \
memd(R0 + #_PT_R1312) = R13:12; \
R17:16 = C13:12; }\
{ memd(R0 + #_PT_R1110) = R11:10; \
R15 = lc0; } \
{ memd(R0 + #_PT_R0908) = R9:8; \
R14 = sa0; } \
memd(R0 + #_PT_R0908) = R9:8; \
R15:14 = C1:0; } \
{ memd(R0 + #_PT_R0706) = R7:6; \
R13 = lc1; } \
{ memd(R0 + #_PT_R0504) = R5:4; \
R12 = sa1; } \
{ memd(R0 + #_PT_UGPGP) = R31:30; \
R11 = m1; \
R2.H = #HI(_THREAD_SIZE); } \
{ memd(R0 + #_PT_LC0SA0) = R15:14; \
R10 = m0; \
R2.L = #LO(_THREAD_SIZE); } \
{ memd(R0 + #_PT_LC1SA1) = R13:12; \
R15 = p3:0; \
R2 = neg(R2); } \
memd(R0 + #_PT_R0504) = R5:4; \
R13:12 = C3:2; } \
{ memd(R0 + #_PT_GPUGP) = R31:30; \
memd(R0 + #_PT_LC0SA0) = R15:14; \
R11:10 = C7:6; }\
{ THREADINFO_REG = and(R0, # ## #-_THREAD_SIZE); \
memd(R0 + #_PT_LC1SA1) = R13:12; \
R15 = p3:0; }\
{ memd(R0 + #_PT_M1M0) = R11:10; \
R14 = usr; \
R2 = and(R0,R2); } \
{ memd(R0 + #_PT_PREDSUSR) = R15:14; \
THREADINFO_REG = R2; } \
memw(R0 + #_PT_PREDSUSR + 4) = R15; }\
{ r24 = memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS); \
memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R0; \
R2 = #-1; } \
{ memw(R0 + #_PT_SYSCALL_NR) = R2; \
memd(R0 + #_PT_CS1CS0) = R17:16; \
R30 = #0; }
#endif

/*
* Restore registers and thread_info.regs state. THREADINFO_REG
* is assumed to still be sane, and R24 to have been correctly
* preserved. Don't restore R29 (SP) until later.
*/

#if CONFIG_HEXAGON_ARCH_VERSION < 4
#define restore_pt_regs() \
{ memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R24; \
R15:14 = memd(R0 + #_PT_PREDSUSR); } \
Expand Down Expand Up @@ -121,11 +162,44 @@
R23:22 = memd(R0 + #_PT_R2322); } \
{ R25:24 = memd(R0 + #_PT_R2524); \
R27:26 = memd(R0 + #_PT_R2726); } \
R31:30 = memd(R0 + #_PT_UGPGP); \
R31:30 = memd(R0 + #_PT_GPUGP); \
{ R28 = memw(R0 + #_PT_R2928); \
ugp = R31; } \
{ R31:30 = memd(R0 + #_PT_R3130); \
gp = R30; }
#else
/* V4+ */
#define restore_pt_regs() \
{ memw(THREADINFO_REG + #_THREAD_INFO_PT_REGS) = R24; \
R15:14 = memd(R0 + #_PT_PREDSUSR); } \
{ R11:10 = memd(R0 + #_PT_M1M0); \
R13:12 = memd(R0 + #_PT_LC1SA1); \
p3:0 = R15; } \
{ R15:14 = memd(R0 + #_PT_LC0SA0); \
R3:2 = memd(R0 + #_PT_R0302); \
usr = R14; } \
{ R5:4 = memd(R0 + #_PT_R0504); \
R7:6 = memd(R0 + #_PT_R0706); \
C7:6 = R11:10; }\
{ R9:8 = memd(R0 + #_PT_R0908); \
R11:10 = memd(R0 + #_PT_R1110); \
C3:2 = R13:12; }\
{ R13:12 = memd(R0 + #_PT_R1312); \
R15:14 = memd(R0 + #_PT_R1514); \
C1:0 = R15:14; }\
{ R17:16 = memd(R0 + #_PT_R1716); \
R19:18 = memd(R0 + #_PT_R1918); } \
{ R21:20 = memd(R0 + #_PT_R2120); \
R23:22 = memd(R0 + #_PT_R2322); } \
{ R25:24 = memd(R0 + #_PT_R2524); \
R27:26 = memd(R0 + #_PT_R2726); } \
R31:30 = memd(R0 + #_PT_CS1CS0); \
{ C13:12 = R31:30; \
R31:30 = memd(R0 + #_PT_GPUGP) ; \
R28 = memw(R0 + #_PT_R2928); }\
{ C11:10 = R31:30; \
R31:30 = memd(R0 + #_PT_R3130); }
#endif

/*
* Clears off enough space for the rest of pt_regs; evrec is a part
Expand All @@ -139,6 +213,7 @@
* Need to save off R0, R1, R2, R3 immediately.
*/

#if CONFIG_HEXAGON_ARCH_VERSION < 4
#define vm_event_entry(CHandler) \
{ \
R29 = add(R29, #-(_PT_REGS_SIZE)); \
Expand All @@ -158,6 +233,34 @@
R1.H = #HI(CHandler); \
jump event_dispatch; \
}
#else
/* V4+ */
/* turn on I$ prefetch early */
/* the # ## # syntax inserts a literal ## */
#define vm_event_entry(CHandler) \
{ \
R29 = add(R29, #-(_PT_REGS_SIZE)); \
memd(R29 + #(_PT_R0100 + -_PT_REGS_SIZE)) = R1:0; \
memd(R29 + #(_PT_R0302 + -_PT_REGS_SIZE)) = R3:2; \
R0 = usr; \
} \
{ \
memw(R29 + #_PT_PREDSUSR) = R0; \
R0 = setbit(R0, #16); \
} \
usr = R0; \
R1:0 = G1:0; \
{ \
memd(R29 + #_PT_ER_VMEL) = R1:0; \
R1 = # ## #(CHandler); \
R3:2 = G3:2; \
} \
{ \
R0 = R29; \
memd(R29 + #_PT_ER_VMPSP) = R3:2; \
jump event_dispatch; \
}
#endif

.text
/*
Expand All @@ -184,8 +287,10 @@ event_dispatch:

/* "Nested control path" -- if the previous mode was kernel */
R0 = memw(R29 + #_PT_ER_VMEST);
P0 = tstbit(R0, #HVM_VMEST_UM_SFT);
if !P0 jump restore_all;
{
P0 = tstbit(R0, #HVM_VMEST_UM_SFT);
if (!P0.new) jump:nt restore_all;
}
/*
* Returning from system call, normally coming back from user mode
*/
Expand All @@ -198,11 +303,18 @@ return_from_syscall:
* Coming back from the C-world, our thread info pointer
* should be in the designated register (usually R19)
*/
#if CONFIG_HEXAGON_ARCH_VERSION < 4
R1.L = #LO(_TIF_ALLWORK_MASK)
{
R1.H = #HI(_TIF_ALLWORK_MASK);
R0 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS);
}
#else
{
R1 = ##_TIF_ALLWORK_MASK;
R0 = memw(THREADINFO_REG + #_THREAD_INFO_FLAGS);
}
#endif

/*
* Compare against the "return to userspace" _TIF_WORK_MASK
Expand All @@ -222,10 +334,14 @@ work_pending:
work_notifysig:
/* this is the part that's kind of fuzzy. */
R1 = and(R0, #(_TIF_SIGPENDING | _TIF_NOTIFY_RESUME));
P0 = cmp.eq(R1, #0);
if P0 jump restore_all
R1 = R0; /* unsigned long thread_info_flags */
R0 = R29; /* regs should still be at top of stack */
{
P0 = cmp.eq(R1, #0);
if P0.new jump:t restore_all;
}
{
R1 = R0; /* unsigned long thread_info_flags */
R0 = R29; /* regs should still be at top of stack */
}
call do_notify_resume

restore_all:
Expand All @@ -235,14 +351,23 @@ restore_all:

/* do the setregs here for VM 0.5 */
/* R29 here should already be pointing at pt_regs */
R1:0 = memd(R29 + #_PT_ER_VMEL);
R3:2 = memd(R29 + #_PT_ER_VMPSP);
{
R1:0 = memd(R29 + #_PT_ER_VMEL);
R3:2 = memd(R29 + #_PT_ER_VMPSP);
}
#if CONFIG_HEXAGON_ARCH_VERSION < 4
trap1(#HVM_TRAP1_VMSETREGS);
#else
G1:0 = R1:0;
G3:2 = R3:2;
#endif

R0 = R29
restore_pt_regs()
R1:0 = memd(R29 + #_PT_R0100);
R29 = add(R29, #_PT_REGS_SIZE);
{
R1:0 = memd(R29 + #_PT_R0100);
R29 = add(R29, #_PT_REGS_SIZE);
}
trap1(#HVM_TRAP1_VMRTE)
/* Notreached */

Expand Down
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