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MIPS: Use struct mips_abi offsets to save FP context

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When saving FP state to struct sigcontext, make use of the offsets
provided by struct mips_abi to obtain appropriate addresses for the
sc_fpregs & sc_fpc_csr fields of the sigcontext. This is done only for
the native struct sigcontext in this patch (ie. for O32 in CONFIG_32BIT
kernels or for N64 in CONFIG_64BIT kernels) but is done in preparation
for sharing this code with compat ABIs in further patches.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Matthew Fortune <matthew.fortune@imgtec.com>
Cc: Leonid Yegoshin <Leonid.Yegoshin@imgtec.com>
Cc: linux-kernel@vger.kernel.org
Cc: Richard Weinberger <richard@nod.at>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Markos Chandras <markos.chandras@imgtec.com>
Cc: Manuel Lauss <manuel.lauss@gmail.com>
Cc: Maciej W. Rozycki <macro@codesourcery.com>
Patchwork: https://patchwork.linux-mips.org/patch/10789/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton
2015-07-27 12:58:15 -07:00
committed by Ralf Baechle
parent 778561006e
commit 2db9ca0a35
3 changed files with 145 additions and 97 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
arch/mips/kernel/signal.c
View File

@@ -41,11 +41,8 @@
#include "signal-common.h"
static int (*save_fp_context)(struct sigcontext __user *sc);
static int (*restore_fp_context)(struct sigcontext __user *sc);
extern asmlinkage int _save_fp_context(struct sigcontext __user *sc);
extern asmlinkage int _restore_fp_context(struct sigcontext __user *sc);
static int (*save_fp_context)(void __user *sc);
static int (*restore_fp_context)(void __user *sc);
struct sigframe {
u32 sf_ass[4]; /* argument save space for o32 */
@@ -65,41 +62,71 @@ struct rt_sigframe {
* Thread saved context copy to/from a signal context presumed to be on the
* user stack, and therefore accessed with appropriate macros from uaccess.h.
*/
static int copy_fp_to_sigcontext(struct sigcontext __user *sc)
static int copy_fp_to_sigcontext(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
int i;
int err = 0;
for (i = 0; i < NUM_FPU_REGS; i++) {
err |=
__put_user(get_fpr64(&current->thread.fpu.fpr[i], 0),
&sc->sc_fpregs[i]);
&fpregs[i]);
}
err |= __put_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
err |= __put_user(current->thread.fpu.fcr31, csr);
return err;
}
static int copy_fp_from_sigcontext(struct sigcontext __user *sc)
static int copy_fp_from_sigcontext(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
int i;
int err = 0;
u64 fpr_val;
for (i = 0; i < NUM_FPU_REGS; i++) {
err |= __get_user(fpr_val, &sc->sc_fpregs[i]);
err |= __get_user(fpr_val, &fpregs[i]);
set_fpr64(&current->thread.fpu.fpr[i], 0, fpr_val);
}
err |= __get_user(current->thread.fpu.fcr31, &sc->sc_fpc_csr);
err |= __get_user(current->thread.fpu.fcr31, csr);
return err;
}
/*
* Wrappers for the assembly _{save,restore}_fp_context functions.
*/
static int save_hw_fp_context(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
return _save_fp_context(fpregs, csr);
}
static int restore_hw_fp_context(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
return _restore_fp_context(fpregs, csr);
}
/*
* Helper routines
*/
static int protected_save_fp_context(struct sigcontext __user *sc)
static int protected_save_fp_context(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
int err;
/*
@@ -121,9 +148,9 @@ static int protected_save_fp_context(struct sigcontext __user *sc)
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __put_user(0, &sc->sc_fpregs[0]) |
__put_user(0, &sc->sc_fpregs[31]) |
__put_user(0, &sc->sc_fpc_csr);
err = __put_user(0, &fpregs[0]) |
__put_user(0, &fpregs[31]) |
__put_user(0, csr);
if (err)
break; /* really bad sigcontext */
}
@@ -131,8 +158,11 @@ static int protected_save_fp_context(struct sigcontext __user *sc)
return err;
}
static int protected_restore_fp_context(struct sigcontext __user *sc)
static int protected_restore_fp_context(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
uint64_t __user *fpregs = sc + abi->off_sc_fpregs;
uint32_t __user *csr = sc + abi->off_sc_fpc_csr;
int err, tmp __maybe_unused;
/*
@@ -155,9 +185,9 @@ static int protected_restore_fp_context(struct sigcontext __user *sc)
if (likely(!err))
break;
/* touch the sigcontext and try again */
err = __get_user(tmp, &sc->sc_fpregs[0]) |
__get_user(tmp, &sc->sc_fpregs[31]) |
__get_user(tmp, &sc->sc_fpc_csr);
err = __get_user(tmp, &fpregs[0]) |
__get_user(tmp, &fpregs[31]) |
__get_user(tmp, csr);
if (err)
break; /* really bad sigcontext */
}
@@ -225,11 +255,12 @@ int fpcsr_pending(unsigned int __user *fpcsr)
}
static int
check_and_restore_fp_context(struct sigcontext __user *sc)
check_and_restore_fp_context(void __user *sc)
{
struct mips_abi *abi = current->thread.abi;
int err, sig;
err = sig = fpcsr_pending(&sc->sc_fpc_csr);
err = sig = fpcsr_pending(sc + abi->off_sc_fpc_csr);
if (err > 0)
err = 0;
err |= protected_restore_fp_context(sc);
@@ -634,17 +665,17 @@ asmlinkage void do_notify_resume(struct pt_regs *regs, void *unused,
}
#ifdef CONFIG_SMP
static int smp_save_fp_context(struct sigcontext __user *sc)
static int smp_save_fp_context(void __user *sc)
{
return raw_cpu_has_fpu
? _save_fp_context(sc)
? save_hw_fp_context(sc)
: copy_fp_to_sigcontext(sc);
}
static int smp_restore_fp_context(struct sigcontext __user *sc)
static int smp_restore_fp_context(void __user *sc)
{
return raw_cpu_has_fpu
? _restore_fp_context(sc)
? restore_hw_fp_context(sc)
: copy_fp_from_sigcontext(sc);
}
#endif
@@ -657,8 +688,8 @@ static int signal_setup(void)
restore_fp_context = smp_restore_fp_context;
#else
if (cpu_has_fpu) {
save_fp_context = _save_fp_context;
restore_fp_context = _restore_fp_context;
save_fp_context = save_hw_fp_context;
restore_fp_context = restore_hw_fp_context;
} else {
save_fp_context = copy_fp_to_sigcontext;
restore_fp_context = copy_fp_from_sigcontext;