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| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-09-03 20:45:52 +0200 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-09-03 20:45:52 +0200 |
| commit | 051168df528fe4456d63f5f65b041c147c26fe97 (patch) | |
| tree | 789109ca42db49bf4d8c0c2794cf55659a171a39 /arch/tile/kernel | |
| parent | tile: clean up relocate_kernel_64 debug code (diff) | |
| download | linux-051168df528fe4456d63f5f65b041c147c26fe97.tar.xz linux-051168df528fe4456d63f5f65b041c147c26fe97.zip | |
tile: don't assume user privilege is zero
Technically, user privilege is anything less than kernel
privilege. We modify the existing user_mode() macro to have
this semantic (and use it in a couple of places it wasn't being
used before), and add an IS_KERNEL_EX1() macro to the assembly
code as well.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/kernel')
| -rw-r--r-- | arch/tile/kernel/intvec_64.S | 23 | ||||
| -rw-r--r-- | arch/tile/kernel/stack.c | 2 |
2 files changed, 18 insertions, 7 deletions
diff --git a/arch/tile/kernel/intvec_64.S b/arch/tile/kernel/intvec_64.S index 3b35bb490d3e..f020f01960cf 100644 --- a/arch/tile/kernel/intvec_64.S +++ b/arch/tile/kernel/intvec_64.S @@ -34,6 +34,16 @@ #define PTREGS_OFFSET_SYSCALL PTREGS_OFFSET_REG(TREG_SYSCALL_NR) +#if CONFIG_KERNEL_PL == 1 || CONFIG_KERNEL_PL == 2 +/* + * Set "result" non-zero if ex1 holds the PL of the kernel + * (with or without ICS being set). Note this works only + * because we never find the PL at level 3. + */ +# define IS_KERNEL_EX1(result, ex1) andi result, ex1, CONFIG_KERNEL_PL +#else +# error Recode IS_KERNEL_EX1 for CONFIG_KERNEL_PL +#endif .macro push_reg reg, ptr=sp, delta=-8 { @@ -308,7 +318,7 @@ intvec_\vecname: */ { blbs sp, 2f - andi r0, r0, SPR_EX_CONTEXT_1_1__PL_MASK /* mask off ICS */ + IS_KERNEL_EX1(r0, r0) } .ifc \vecnum, INT_DOUBLE_FAULT @@ -641,11 +651,12 @@ intvec_\vecname: /* * If we will be returning to the kernel, we will need to * reset the interrupt masks to the state they had before. - * Set DISABLE_IRQ in flags iff we came from PL1 with irqs disabled. + * Set DISABLE_IRQ in flags iff we came from kernel pl with + * irqs disabled. */ mfspr r32, SPR_EX_CONTEXT_K_1 { - andi r32, r32, SPR_EX_CONTEXT_1_1__PL_MASK /* mask off ICS */ + IS_KERNEL_EX1(r22, r22) PTREGS_PTR(r21, PTREGS_OFFSET_FLAGS) } beqzt r32, 1f /* zero if from user space */ @@ -812,7 +823,7 @@ STD_ENTRY(interrupt_return) PTREGS_PTR(r29, PTREGS_OFFSET_EX1) } ld r29, r29 - andi r29, r29, SPR_EX_CONTEXT_1_1__PL_MASK /* mask off ICS */ + IS_KERNEL_EX1(r29, r29) { beqzt r29, .Lresume_userspace move r29, sp @@ -936,7 +947,7 @@ STD_ENTRY(interrupt_return) PTREGS_PTR(r32, PTREGS_OFFSET_FLAGS) } { - andi r0, r0, SPR_EX_CONTEXT_1_1__PL_MASK + IS_KERNEL_EX1(r0, r0) ld r32, r32 } bnez r0, 1f @@ -1007,7 +1018,7 @@ STD_ENTRY(interrupt_return) pop_reg r21, sp, PTREGS_OFFSET_REG(31) - PTREGS_OFFSET_PC { mtspr SPR_EX_CONTEXT_K_1, lr - andi lr, lr, SPR_EX_CONTEXT_1_1__PL_MASK /* mask off ICS */ + IS_KERNEL_EX1(lr, lr) } { mtspr SPR_EX_CONTEXT_K_0, r21 diff --git a/arch/tile/kernel/stack.c b/arch/tile/kernel/stack.c index 24fd223df65d..362284af3afd 100644 --- a/arch/tile/kernel/stack.c +++ b/arch/tile/kernel/stack.c @@ -103,7 +103,7 @@ static struct pt_regs *valid_fault_handler(struct KBacktraceIterator* kbt) p->sp >= sp) { if (kbt->verbose) pr_err(" <%s while in kernel mode>\n", fault); - } else if (EX1_PL(p->ex1) == USER_PL && + } else if (user_mode(p) && p->sp < PAGE_OFFSET && p->sp != 0) { if (kbt->verbose) pr_err(" <%s while in user mode>\n", fault); |