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-rw-r--r--arch/m68k/kernel/asm-offsets.c2
-rw-r--r--arch/m68k/kernel/entry.S58
-rw-r--r--arch/m68k/kernel/process.c4
-rw-r--r--arch/m68k/kernel/signal.c199
-rw-r--r--arch/m68k/kernel/syscalls/syscall.tbl4
-rw-r--r--arch/m68k/kernel/traps.c15
6 files changed, 122 insertions, 160 deletions
diff --git a/arch/m68k/kernel/asm-offsets.c b/arch/m68k/kernel/asm-offsets.c
index ccea355052ef..906d73230537 100644
--- a/arch/m68k/kernel/asm-offsets.c
+++ b/arch/m68k/kernel/asm-offsets.c
@@ -31,7 +31,7 @@ int main(void)
DEFINE(THREAD_KSP, offsetof(struct thread_struct, ksp));
DEFINE(THREAD_USP, offsetof(struct thread_struct, usp));
DEFINE(THREAD_SR, offsetof(struct thread_struct, sr));
- DEFINE(THREAD_FS, offsetof(struct thread_struct, fs));
+ DEFINE(THREAD_FC, offsetof(struct thread_struct, fc));
DEFINE(THREAD_CRP, offsetof(struct thread_struct, crp));
DEFINE(THREAD_ESP0, offsetof(struct thread_struct, esp0));
DEFINE(THREAD_FPREG, offsetof(struct thread_struct, fp));
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 9dd76fbb7c6b..9434fca68de5 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -36,7 +36,6 @@
#include <linux/linkage.h>
#include <asm/errno.h>
#include <asm/setup.h>
-#include <asm/segment.h>
#include <asm/traps.h>
#include <asm/unistd.h>
#include <asm/asm-offsets.h>
@@ -78,20 +77,38 @@ ENTRY(__sys_clone3)
ENTRY(sys_sigreturn)
SAVE_SWITCH_STACK
- movel %sp,%sp@- | switch_stack pointer
- pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
+ movel %sp,%a1 | switch_stack pointer
+ lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
+ lea %sp@(-84),%sp | leave a gap
+ movel %a1,%sp@-
+ movel %a0,%sp@-
jbsr do_sigreturn
- addql #8,%sp
- RESTORE_SWITCH_STACK
- rts
+ jra 1f | shared with rt_sigreturn()
ENTRY(sys_rt_sigreturn)
SAVE_SWITCH_STACK
- movel %sp,%sp@- | switch_stack pointer
- pea %sp@(SWITCH_STACK_SIZE+4) | pt_regs pointer
+ movel %sp,%a1 | switch_stack pointer
+ lea %sp@(SWITCH_STACK_SIZE),%a0 | pt_regs pointer
+ lea %sp@(-84),%sp | leave a gap
+ movel %a1,%sp@-
+ movel %a0,%sp@-
+ | stack contents:
+ | [original pt_regs address] [original switch_stack address]
+ | [gap] [switch_stack] [pt_regs] [exception frame]
jbsr do_rt_sigreturn
- addql #8,%sp
+
+1:
+ | stack contents now:
+ | [original pt_regs address] [original switch_stack address]
+ | [unused part of the gap] [moved switch_stack] [moved pt_regs]
+ | [replacement exception frame]
+ | return value of do_{rt_,}sigreturn() points to moved switch_stack.
+
+ movel %d0,%sp | discard the leftover junk
RESTORE_SWITCH_STACK
+ | stack contents now is just [syscall return address] [pt_regs] [frame]
+ | return pt_regs.d0
+ movel %sp@(PT_OFF_D0+4),%d0
rts
ENTRY(buserr)
@@ -182,25 +199,6 @@ do_trace_exit:
addql #4,%sp
jra .Lret_from_exception
-ENTRY(ret_from_signal)
- movel %curptr@(TASK_STACK),%a1
- tstb %a1@(TINFO_FLAGS+2)
- jge 1f
- jbsr syscall_trace
-1: RESTORE_SWITCH_STACK
- addql #4,%sp
-/* on 68040 complete pending writebacks if any */
-#ifdef CONFIG_M68040
- bfextu %sp@(PT_OFF_FORMATVEC){#0,#4},%d0
- subql #7,%d0 | bus error frame ?
- jbne 1f
- movel %sp,%sp@-
- jbsr berr_040cleanup
- addql #4,%sp
-1:
-#endif
- jra .Lret_from_exception
-
ENTRY(system_call)
SAVE_ALL_SYS
@@ -338,7 +336,7 @@ resume:
/* save fs (sfc,%dfc) (may be pointing to kernel memory) */
movec %sfc,%d0
- movew %d0,%a0@(TASK_THREAD+THREAD_FS)
+ movew %d0,%a0@(TASK_THREAD+THREAD_FC)
/* save usp */
/* it is better to use a movel here instead of a movew 8*) */
@@ -424,7 +422,7 @@ resume:
movel %a0,%usp
/* restore fs (sfc,%dfc) */
- movew %a1@(TASK_THREAD+THREAD_FS),%a0
+ movew %a1@(TASK_THREAD+THREAD_FC),%a0
movec %a0,%sfc
movec %a0,%dfc
diff --git a/arch/m68k/kernel/process.c b/arch/m68k/kernel/process.c
index db49f9091711..1ab692b952cd 100644
--- a/arch/m68k/kernel/process.c
+++ b/arch/m68k/kernel/process.c
@@ -92,7 +92,7 @@ void show_regs(struct pt_regs * regs)
void flush_thread(void)
{
- current->thread.fs = __USER_DS;
+ current->thread.fc = USER_DATA;
#ifdef CONFIG_FPU
if (!FPU_IS_EMU) {
unsigned long zero = 0;
@@ -155,7 +155,7 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, unsigned long arg,
* Must save the current SFC/DFC value, NOT the value when
* the parent was last descheduled - RGH 10-08-96
*/
- p->thread.fs = get_fs().seg;
+ p->thread.fc = USER_DATA;
if (unlikely(p->flags & (PF_KTHREAD | PF_IO_WORKER))) {
/* kernel thread */
diff --git a/arch/m68k/kernel/signal.c b/arch/m68k/kernel/signal.c
index 8f215e79e70e..338817d0cb3f 100644
--- a/arch/m68k/kernel/signal.c
+++ b/arch/m68k/kernel/signal.c
@@ -447,7 +447,7 @@ static inline void save_fpu_state(struct sigcontext *sc, struct pt_regs *regs)
if (CPU_IS_060 ? sc->sc_fpstate[2] : sc->sc_fpstate[0]) {
fpu_version = sc->sc_fpstate[0];
- if (CPU_IS_020_OR_030 &&
+ if (CPU_IS_020_OR_030 && !regs->stkadj &&
regs->vector >= (VEC_FPBRUC * 4) &&
regs->vector <= (VEC_FPNAN * 4)) {
/* Clear pending exception in 68882 idle frame */
@@ -510,7 +510,7 @@ static inline int rt_save_fpu_state(struct ucontext __user *uc, struct pt_regs *
if (!(CPU_IS_060 || CPU_IS_COLDFIRE))
context_size = fpstate[1];
fpu_version = fpstate[0];
- if (CPU_IS_020_OR_030 &&
+ if (CPU_IS_020_OR_030 && !regs->stkadj &&
regs->vector >= (VEC_FPBRUC * 4) &&
regs->vector <= (VEC_FPNAN * 4)) {
/* Clear pending exception in 68882 idle frame */
@@ -641,56 +641,35 @@ static inline void siginfo_build_tests(void)
static int mangle_kernel_stack(struct pt_regs *regs, int formatvec,
void __user *fp)
{
- int fsize = frame_extra_sizes(formatvec >> 12);
- if (fsize < 0) {
+ int extra = frame_extra_sizes(formatvec >> 12);
+ char buf[sizeof_field(struct frame, un)];
+
+ if (extra < 0) {
/*
* user process trying to return with weird frame format
*/
pr_debug("user process returning with weird frame format\n");
- return 1;
+ return -1;
}
- if (!fsize) {
- regs->format = formatvec >> 12;
- regs->vector = formatvec & 0xfff;
- } else {
- struct switch_stack *sw = (struct switch_stack *)regs - 1;
- /* yes, twice as much as max(sizeof(frame.un.fmt<x>)) */
- unsigned long buf[sizeof_field(struct frame, un) / 2];
-
- /* that'll make sure that expansion won't crap over data */
- if (copy_from_user(buf + fsize / 4, fp, fsize))
- return 1;
-
- /* point of no return */
- regs->format = formatvec >> 12;
- regs->vector = formatvec & 0xfff;
-#define frame_offset (sizeof(struct pt_regs)+sizeof(struct switch_stack))
- __asm__ __volatile__ (
-#ifdef CONFIG_COLDFIRE
- " movel %0,%/sp\n\t"
- " bra ret_from_signal\n"
-#else
- " movel %0,%/a0\n\t"
- " subl %1,%/a0\n\t" /* make room on stack */
- " movel %/a0,%/sp\n\t" /* set stack pointer */
- /* move switch_stack and pt_regs */
- "1: movel %0@+,%/a0@+\n\t"
- " dbra %2,1b\n\t"
- " lea %/sp@(%c3),%/a0\n\t" /* add offset of fmt */
- " lsrl #2,%1\n\t"
- " subql #1,%1\n\t"
- /* copy to the gap we'd made */
- "2: movel %4@+,%/a0@+\n\t"
- " dbra %1,2b\n\t"
- " bral ret_from_signal\n"
+ if (extra && copy_from_user(buf, fp, extra))
+ return -1;
+ regs->format = formatvec >> 12;
+ regs->vector = formatvec & 0xfff;
+ if (extra) {
+ void *p = (struct switch_stack *)regs - 1;
+ struct frame *new = (void *)regs - extra;
+ int size = sizeof(struct pt_regs)+sizeof(struct switch_stack);
+
+ memmove(p - extra, p, size);
+ memcpy(p - extra + size, buf, extra);
+ current->thread.esp0 = (unsigned long)&new->ptregs;
+#ifdef CONFIG_M68040
+ /* on 68040 complete pending writebacks if any */
+ if (new->ptregs.format == 7) // bus error frame
+ berr_040cleanup(new);
#endif
- : /* no outputs, it doesn't ever return */
- : "a" (sw), "d" (fsize), "d" (frame_offset/4-1),
- "n" (frame_offset), "a" (buf + fsize/4)
- : "a0");
-#undef frame_offset
}
- return 0;
+ return extra;
}
static inline int
@@ -698,7 +677,6 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
{
int formatvec;
struct sigcontext context;
- int err = 0;
siginfo_build_tests();
@@ -707,7 +685,7 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
/* get previous context */
if (copy_from_user(&context, usc, sizeof(context)))
- goto badframe;
+ return -1;
/* restore passed registers */
regs->d0 = context.sc_d0;
@@ -720,15 +698,10 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *usc, void __u
wrusp(context.sc_usp);
formatvec = context.sc_formatvec;
- err = restore_fpu_state(&context);
+ if (restore_fpu_state(&context))
+ return -1;
- if (err || mangle_kernel_stack(regs, formatvec, fp))
- goto badframe;
-
- return 0;
-
-badframe:
- return 1;
+ return mangle_kernel_stack(regs, formatvec, fp);
}
static inline int
@@ -745,7 +718,7 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
err = __get_user(temp, &uc->uc_mcontext.version);
if (temp != MCONTEXT_VERSION)
- goto badframe;
+ return -1;
/* restore passed registers */
err |= __get_user(regs->d0, &gregs[0]);
err |= __get_user(regs->d1, &gregs[1]);
@@ -774,22 +747,17 @@ rt_restore_ucontext(struct pt_regs *regs, struct switch_stack *sw,
err |= restore_altstack(&uc->uc_stack);
if (err)
- goto badframe;
+ return -1;
- if (mangle_kernel_stack(regs, temp, &uc->uc_extra))
- goto badframe;
-
- return 0;
-
-badframe:
- return 1;
+ return mangle_kernel_stack(regs, temp, &uc->uc_extra);
}
-asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
+asmlinkage void *do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
{
unsigned long usp = rdusp();
struct sigframe __user *frame = (struct sigframe __user *)(usp - 4);
sigset_t set;
+ int size;
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
@@ -801,20 +769,22 @@ asmlinkage int do_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
set_current_blocked(&set);
- if (restore_sigcontext(regs, &frame->sc, frame + 1))
+ size = restore_sigcontext(regs, &frame->sc, frame + 1);
+ if (size < 0)
goto badframe;
- return regs->d0;
+ return (void *)sw - size;
badframe:
force_sig(SIGSEGV);
- return 0;
+ return sw;
}
-asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
+asmlinkage void *do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
{
unsigned long usp = rdusp();
struct rt_sigframe __user *frame = (struct rt_sigframe __user *)(usp - 4);
sigset_t set;
+ int size;
if (!access_ok(frame, sizeof(*frame)))
goto badframe;
@@ -823,27 +793,34 @@ asmlinkage int do_rt_sigreturn(struct pt_regs *regs, struct switch_stack *sw)
set_current_blocked(&set);
- if (rt_restore_ucontext(regs, sw, &frame->uc))
+ size = rt_restore_ucontext(regs, sw, &frame->uc);
+ if (size < 0)
goto badframe;
- return regs->d0;
+ return (void *)sw - size;
badframe:
force_sig(SIGSEGV);
- return 0;
+ return sw;
+}
+
+static inline struct pt_regs *rte_regs(struct pt_regs *regs)
+{
+ return (void *)regs + regs->stkadj;
}
static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
unsigned long mask)
{
+ struct pt_regs *tregs = rte_regs(regs);
sc->sc_mask = mask;
sc->sc_usp = rdusp();
sc->sc_d0 = regs->d0;
sc->sc_d1 = regs->d1;
sc->sc_a0 = regs->a0;
sc->sc_a1 = regs->a1;
- sc->sc_sr = regs->sr;
- sc->sc_pc = regs->pc;
- sc->sc_formatvec = regs->format << 12 | regs->vector;
+ sc->sc_sr = tregs->sr;
+ sc->sc_pc = tregs->pc;
+ sc->sc_formatvec = tregs->format << 12 | tregs->vector;
save_a5_state(sc, regs);
save_fpu_state(sc, regs);
}
@@ -851,6 +828,7 @@ static void setup_sigcontext(struct sigcontext *sc, struct pt_regs *regs,
static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *regs)
{
struct switch_stack *sw = (struct switch_stack *)regs - 1;
+ struct pt_regs *tregs = rte_regs(regs);
greg_t __user *gregs = uc->uc_mcontext.gregs;
int err = 0;
@@ -871,9 +849,9 @@ static inline int rt_setup_ucontext(struct ucontext __user *uc, struct pt_regs *
err |= __put_user(sw->a5, &gregs[13]);
err |= __put_user(sw->a6, &gregs[14]);
err |= __put_user(rdusp(), &gregs[15]);
- err |= __put_user(regs->pc, &gregs[16]);
- err |= __put_user(regs->sr, &gregs[17]);
- err |= __put_user((regs->format << 12) | regs->vector, &uc->uc_formatvec);
+ err |= __put_user(tregs->pc, &gregs[16]);
+ err |= __put_user(tregs->sr, &gregs[17]);
+ err |= __put_user((tregs->format << 12) | tregs->vector, &uc->uc_formatvec);
err |= rt_save_fpu_state(uc, regs);
return err;
}
@@ -890,13 +868,14 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct sigframe __user *frame;
- int fsize = frame_extra_sizes(regs->format);
+ struct pt_regs *tregs = rte_regs(regs);
+ int fsize = frame_extra_sizes(tregs->format);
struct sigcontext context;
int err = 0, sig = ksig->sig;
if (fsize < 0) {
pr_debug("setup_frame: Unknown frame format %#x\n",
- regs->format);
+ tregs->format);
return -EFAULT;
}
@@ -907,7 +886,7 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
err |= __put_user(sig, &frame->sig);
- err |= __put_user(regs->vector, &frame->code);
+ err |= __put_user(tregs->vector, &frame->code);
err |= __put_user(&frame->sc, &frame->psc);
if (_NSIG_WORDS > 1)
@@ -934,33 +913,27 @@ static int setup_frame(struct ksignal *ksig, sigset_t *set,
push_cache ((unsigned long) &frame->retcode);
/*
- * Set up registers for signal handler. All the state we are about
- * to destroy is successfully copied to sigframe.
- */
- wrusp ((unsigned long) frame);
- regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
- adjustformat(regs);
-
- /*
* This is subtle; if we build more than one sigframe, all but the
* first one will see frame format 0 and have fsize == 0, so we won't
* screw stkadj.
*/
- if (fsize)
+ if (fsize) {
regs->stkadj = fsize;
-
- /* Prepare to skip over the extra stuff in the exception frame. */
- if (regs->stkadj) {
- struct pt_regs *tregs =
- (struct pt_regs *)((ulong)regs + regs->stkadj);
+ tregs = rte_regs(regs);
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
- /* This must be copied with decreasing addresses to
- handle overlaps. */
tregs->vector = 0;
tregs->format = 0;
- tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
+
+ /*
+ * Set up registers for signal handler. All the state we are about
+ * to destroy is successfully copied to sigframe.
+ */
+ wrusp ((unsigned long) frame);
+ tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
+ adjustformat(regs);
+
return 0;
}
@@ -968,7 +941,8 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
struct pt_regs *regs)
{
struct rt_sigframe __user *frame;
- int fsize = frame_extra_sizes(regs->format);
+ struct pt_regs *tregs = rte_regs(regs);
+ int fsize = frame_extra_sizes(tregs->format);
int err = 0, sig = ksig->sig;
if (fsize < 0) {
@@ -1019,33 +993,26 @@ static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
push_cache ((unsigned long) &frame->retcode);
/*
- * Set up registers for signal handler. All the state we are about
- * to destroy is successfully copied to sigframe.
- */
- wrusp ((unsigned long) frame);
- regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
- adjustformat(regs);
-
- /*
* This is subtle; if we build more than one sigframe, all but the
* first one will see frame format 0 and have fsize == 0, so we won't
* screw stkadj.
*/
- if (fsize)
+ if (fsize) {
regs->stkadj = fsize;
-
- /* Prepare to skip over the extra stuff in the exception frame. */
- if (regs->stkadj) {
- struct pt_regs *tregs =
- (struct pt_regs *)((ulong)regs + regs->stkadj);
+ tregs = rte_regs(regs);
pr_debug("Performing stackadjust=%04lx\n", regs->stkadj);
- /* This must be copied with decreasing addresses to
- handle overlaps. */
tregs->vector = 0;
tregs->format = 0;
- tregs->pc = regs->pc;
tregs->sr = regs->sr;
}
+
+ /*
+ * Set up registers for signal handler. All the state we are about
+ * to destroy is successfully copied to sigframe.
+ */
+ wrusp ((unsigned long) frame);
+ tregs->pc = (unsigned long) ksig->ka.sa.sa_handler;
+ adjustformat(regs);
return 0;
}
diff --git a/arch/m68k/kernel/syscalls/syscall.tbl b/arch/m68k/kernel/syscalls/syscall.tbl
index 541bc1b3a8f9..7976dff8f879 100644
--- a/arch/m68k/kernel/syscalls/syscall.tbl
+++ b/arch/m68k/kernel/syscalls/syscall.tbl
@@ -141,7 +141,7 @@
131 common quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
-134 common bdflush sys_bdflush
+134 common bdflush sys_ni_syscall
135 common sysfs sys_sysfs
136 common personality sys_personality
# 137 was afs_syscall
@@ -446,3 +446,5 @@
444 common landlock_create_ruleset sys_landlock_create_ruleset
445 common landlock_add_rule sys_landlock_add_rule
446 common landlock_restrict_self sys_landlock_restrict_self
+# 447 reserved for memfd_secret
+448 common process_mrelease sys_process_mrelease
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 9e1261462bcc..9718ce94cc84 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -181,9 +181,8 @@ static inline void access_error060 (struct frame *fp)
static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
{
unsigned long mmusr;
- mm_segment_t old_fs = get_fs();
- set_fs(MAKE_MM_SEG(wbs));
+ set_fc(wbs);
if (iswrite)
asm volatile (".chip 68040; ptestw (%0); .chip 68k" : : "a" (addr));
@@ -192,7 +191,7 @@ static inline unsigned long probe040(int iswrite, unsigned long addr, int wbs)
asm volatile (".chip 68040; movec %%mmusr,%0; .chip 68k" : "=r" (mmusr));
- set_fs(old_fs);
+ set_fc(USER_DATA);
return mmusr;
}
@@ -201,10 +200,8 @@ static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
unsigned long wbd)
{
int res = 0;
- mm_segment_t old_fs = get_fs();
- /* set_fs can not be moved, otherwise put_user() may oops */
- set_fs(MAKE_MM_SEG(wbs));
+ set_fc(wbs);
switch (wbs & WBSIZ_040) {
case BA_SIZE_BYTE:
@@ -218,9 +215,7 @@ static inline int do_040writeback1(unsigned short wbs, unsigned long wba,
break;
}
- /* set_fs can not be moved, otherwise put_user() may oops */
- set_fs(old_fs);
-
+ set_fc(USER_DATA);
pr_debug("do_040writeback1, res=%d\n", res);
@@ -1150,7 +1145,7 @@ asmlinkage void set_esp0(unsigned long ssp)
*/
asmlinkage void fpsp040_die(void)
{
- do_exit(SIGSEGV);
+ force_sigsegv(SIGSEGV);
}
#ifdef CONFIG_M68KFPU_EMU
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-01 15:26:52 +0000