summaryrefslogtreecommitdiff
path: root/arch/powerpc/kernel/process.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/powerpc/kernel/process.c')
-rw-r--r--arch/powerpc/kernel/process.c147
1 files changed, 86 insertions, 61 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 6f428da53e20..4a96556fd2d4 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -314,32 +314,32 @@ static DEFINE_PER_CPU(struct arch_hw_breakpoint, current_brk);
*/
static void set_debug_reg_defaults(struct thread_struct *thread)
{
- thread->iac1 = thread->iac2 = 0;
+ thread->debug.iac1 = thread->debug.iac2 = 0;
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
- thread->iac3 = thread->iac4 = 0;
+ thread->debug.iac3 = thread->debug.iac4 = 0;
#endif
- thread->dac1 = thread->dac2 = 0;
+ thread->debug.dac1 = thread->debug.dac2 = 0;
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- thread->dvc1 = thread->dvc2 = 0;
+ thread->debug.dvc1 = thread->debug.dvc2 = 0;
#endif
- thread->dbcr0 = 0;
+ thread->debug.dbcr0 = 0;
#ifdef CONFIG_BOOKE
/*
* Force User/Supervisor bits to b11 (user-only MSR[PR]=1)
*/
- thread->dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US | \
+ thread->debug.dbcr1 = DBCR1_IAC1US | DBCR1_IAC2US |
DBCR1_IAC3US | DBCR1_IAC4US;
/*
* Force Data Address Compare User/Supervisor bits to be User-only
* (0b11 MSR[PR]=1) and set all other bits in DBCR2 register to be 0.
*/
- thread->dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US;
+ thread->debug.dbcr2 = DBCR2_DAC1US | DBCR2_DAC2US;
#else
- thread->dbcr1 = 0;
+ thread->debug.dbcr1 = 0;
#endif
}
-static void prime_debug_regs(struct thread_struct *thread)
+static void prime_debug_regs(struct debug_reg *debug)
{
/*
* We could have inherited MSR_DE from userspace, since
@@ -348,22 +348,22 @@ static void prime_debug_regs(struct thread_struct *thread)
*/
mtmsr(mfmsr() & ~MSR_DE);
- mtspr(SPRN_IAC1, thread->iac1);
- mtspr(SPRN_IAC2, thread->iac2);
+ mtspr(SPRN_IAC1, debug->iac1);
+ mtspr(SPRN_IAC2, debug->iac2);
#if CONFIG_PPC_ADV_DEBUG_IACS > 2
- mtspr(SPRN_IAC3, thread->iac3);
- mtspr(SPRN_IAC4, thread->iac4);
+ mtspr(SPRN_IAC3, debug->iac3);
+ mtspr(SPRN_IAC4, debug->iac4);
#endif
- mtspr(SPRN_DAC1, thread->dac1);
- mtspr(SPRN_DAC2, thread->dac2);
+ mtspr(SPRN_DAC1, debug->dac1);
+ mtspr(SPRN_DAC2, debug->dac2);
#if CONFIG_PPC_ADV_DEBUG_DVCS > 0
- mtspr(SPRN_DVC1, thread->dvc1);
- mtspr(SPRN_DVC2, thread->dvc2);
+ mtspr(SPRN_DVC1, debug->dvc1);
+ mtspr(SPRN_DVC2, debug->dvc2);
#endif
- mtspr(SPRN_DBCR0, thread->dbcr0);
- mtspr(SPRN_DBCR1, thread->dbcr1);
+ mtspr(SPRN_DBCR0, debug->dbcr0);
+ mtspr(SPRN_DBCR1, debug->dbcr1);
#ifdef CONFIG_BOOKE
- mtspr(SPRN_DBCR2, thread->dbcr2);
+ mtspr(SPRN_DBCR2, debug->dbcr2);
#endif
}
/*
@@ -371,12 +371,13 @@ static void prime_debug_regs(struct thread_struct *thread)
* debug registers, set the debug registers from the values
* stored in the new thread.
*/
-static void switch_booke_debug_regs(struct thread_struct *new_thread)
+void switch_booke_debug_regs(struct debug_reg *new_debug)
{
- if ((current->thread.dbcr0 & DBCR0_IDM)
- || (new_thread->dbcr0 & DBCR0_IDM))
- prime_debug_regs(new_thread);
+ if ((current->thread.debug.dbcr0 & DBCR0_IDM)
+ || (new_debug->dbcr0 & DBCR0_IDM))
+ prime_debug_regs(new_debug);
}
+EXPORT_SYMBOL_GPL(switch_booke_debug_regs);
#else /* !CONFIG_PPC_ADV_DEBUG_REGS */
#ifndef CONFIG_HAVE_HW_BREAKPOINT
static void set_debug_reg_defaults(struct thread_struct *thread)
@@ -596,12 +597,13 @@ struct task_struct *__switch_to(struct task_struct *prev,
struct task_struct *new)
{
struct thread_struct *new_thread, *old_thread;
- unsigned long flags;
struct task_struct *last;
#ifdef CONFIG_PPC_BOOK3S_64
struct ppc64_tlb_batch *batch;
#endif
+ WARN_ON(!irqs_disabled());
+
/* Back up the TAR across context switches.
* Note that the TAR is not available for use in the kernel. (To
* provide this, the TAR should be backed up/restored on exception
@@ -681,7 +683,7 @@ struct task_struct *__switch_to(struct task_struct *prev,
#endif /* CONFIG_SMP */
#ifdef CONFIG_PPC_ADV_DEBUG_REGS
- switch_booke_debug_regs(&new->thread);
+ switch_booke_debug_regs(&new->thread.debug);
#else
/*
* For PPC_BOOK3S_64, we use the hw-breakpoint interfaces that would
@@ -721,8 +723,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
}
#endif /* CONFIG_PPC_BOOK3S_64 */
- local_irq_save(flags);
-
/*
* We can't take a PMU exception inside _switch() since there is a
* window where the kernel stack SLB and the kernel stack are out
@@ -742,8 +742,6 @@ struct task_struct *__switch_to(struct task_struct *prev,
}
#endif /* CONFIG_PPC_BOOK3S_64 */
- local_irq_restore(flags);
-
return last;
}
@@ -860,17 +858,21 @@ void show_regs(struct pt_regs * regs)
printk("MSR: "REG" ", regs->msr);
printbits(regs->msr, msr_bits);
printk(" CR: %08lx XER: %08lx\n", regs->ccr, regs->xer);
-#ifdef CONFIG_PPC64
- printk("SOFTE: %ld\n", regs->softe);
-#endif
trap = TRAP(regs);
if ((regs->trap != 0xc00) && cpu_has_feature(CPU_FTR_CFAR))
- printk("CFAR: "REG"\n", regs->orig_gpr3);
- if (trap == 0x300 || trap == 0x600)
+ printk("CFAR: "REG" ", regs->orig_gpr3);
+ if (trap == 0x200 || trap == 0x300 || trap == 0x600)
#if defined(CONFIG_4xx) || defined(CONFIG_BOOKE)
- printk("DEAR: "REG", ESR: "REG"\n", regs->dar, regs->dsisr);
+ printk("DEAR: "REG" ESR: "REG" ", regs->dar, regs->dsisr);
#else
- printk("DAR: "REG", DSISR: %08lx\n", regs->dar, regs->dsisr);
+ printk("DAR: "REG" DSISR: %08lx ", regs->dar, regs->dsisr);
+#endif
+#ifdef CONFIG_PPC64
+ printk("SOFTE: %ld ", regs->softe);
+#endif
+#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
+ if (MSR_TM_ACTIVE(regs->msr))
+ printk("\nPACATMSCRATCH: %016llx ", get_paca()->tm_scratch);
#endif
for (i = 0; i < 32; i++) {
@@ -889,9 +891,6 @@ void show_regs(struct pt_regs * regs)
printk("NIP ["REG"] %pS\n", regs->nip, (void *)regs->nip);
printk("LR ["REG"] %pS\n", regs->link, (void *)regs->link);
#endif
-#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
- printk("PACATMSCRATCH [%llx]\n", get_paca()->tm_scratch);
-#endif
show_stack(current, (unsigned long *) regs->gpr[1]);
if (!user_mode(regs))
show_instructions(regs);
@@ -1000,13 +999,19 @@ int copy_thread(unsigned long clone_flags, unsigned long usp,
kregs = (struct pt_regs *) sp;
sp -= STACK_FRAME_OVERHEAD;
p->thread.ksp = sp;
+#ifdef CONFIG_PPC32
p->thread.ksp_limit = (unsigned long)task_stack_page(p) +
_ALIGN_UP(sizeof(struct thread_info), 16);
-
+#endif
#ifdef CONFIG_HAVE_HW_BREAKPOINT
p->thread.ptrace_bps[0] = NULL;
#endif
+ p->thread.fp_save_area = NULL;
+#ifdef CONFIG_ALTIVEC
+ p->thread.vr_save_area = NULL;
+#endif
+
#ifdef CONFIG_PPC_STD_MMU_64
if (mmu_has_feature(MMU_FTR_SLB)) {
unsigned long sp_vsid;
@@ -1082,25 +1087,45 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
regs->msr = MSR_USER;
#else
if (!is_32bit_task()) {
- unsigned long entry, toc;
+ unsigned long entry;
- /* start is a relocated pointer to the function descriptor for
- * the elf _start routine. The first entry in the function
- * descriptor is the entry address of _start and the second
- * entry is the TOC value we need to use.
- */
- __get_user(entry, (unsigned long __user *)start);
- __get_user(toc, (unsigned long __user *)start+1);
+ if (is_elf2_task()) {
+ /* Look ma, no function descriptors! */
+ entry = start;
- /* Check whether the e_entry function descriptor entries
- * need to be relocated before we can use them.
- */
- if (load_addr != 0) {
- entry += load_addr;
- toc += load_addr;
+ /*
+ * Ulrich says:
+ * The latest iteration of the ABI requires that when
+ * calling a function (at its global entry point),
+ * the caller must ensure r12 holds the entry point
+ * address (so that the function can quickly
+ * establish addressability).
+ */
+ regs->gpr[12] = start;
+ /* Make sure that's restored on entry to userspace. */
+ set_thread_flag(TIF_RESTOREALL);
+ } else {
+ unsigned long toc;
+
+ /* start is a relocated pointer to the function
+ * descriptor for the elf _start routine. The first
+ * entry in the function descriptor is the entry
+ * address of _start and the second entry is the TOC
+ * value we need to use.
+ */
+ __get_user(entry, (unsigned long __user *)start);
+ __get_user(toc, (unsigned long __user *)start+1);
+
+ /* Check whether the e_entry function descriptor entries
+ * need to be relocated before we can use them.
+ */
+ if (load_addr != 0) {
+ entry += load_addr;
+ toc += load_addr;
+ }
+ regs->gpr[2] = toc;
}
regs->nip = entry;
- regs->gpr[2] = toc;
regs->msr = MSR_USER64;
} else {
regs->nip = start;
@@ -1112,12 +1137,12 @@ void start_thread(struct pt_regs *regs, unsigned long start, unsigned long sp)
#ifdef CONFIG_VSX
current->thread.used_vsr = 0;
#endif
- memset(current->thread.fpr, 0, sizeof(current->thread.fpr));
- current->thread.fpscr.val = 0;
+ memset(&current->thread.fp_state, 0, sizeof(current->thread.fp_state));
+ current->thread.fp_save_area = NULL;
#ifdef CONFIG_ALTIVEC
- memset(current->thread.vr, 0, sizeof(current->thread.vr));
- memset(&current->thread.vscr, 0, sizeof(current->thread.vscr));
- current->thread.vscr.u[3] = 0x00010000; /* Java mode disabled */
+ memset(&current->thread.vr_state, 0, sizeof(current->thread.vr_state));
+ current->thread.vr_state.vscr.u[3] = 0x00010000; /* Java mode disabled */
+ current->thread.vr_save_area = NULL;
current->thread.vrsave = 0;
current->thread.used_vr = 0;
#endif /* CONFIG_ALTIVEC */
generated by cgit v1.2.3 (git 2.0.4) at 2024-06-02 22:43:50 +0000