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yaml
---
r: 133345
b: refs/heads/master
c: b7cf6dd
h: refs/heads/master
i:
  133343: 22dcde8
v: v3
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Magnus Damm authored and Paul Mundt committed Mar 18, 2009
1 parent ef25d9c commit 5739099
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Showing 4 changed files with 203 additions and 33 deletions.
2 changes: 1 addition & 1 deletion [refs]
Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: e4e063d0c288bd65c56dd855337780a541ed928d
refs/heads/master: b7cf6ddc13186f9272438a97aa75972d496d0b0a
7 changes: 7 additions & 0 deletions trunk/arch/sh/Kconfig
Original file line number Diff line number Diff line change
Expand Up @@ -559,6 +559,13 @@ config CRASH_DUMP

For more details see Documentation/kdump/kdump.txt

config KEXEC_JUMP
bool "kexec jump (EXPERIMENTAL)"
depends on SUPERH32 && KEXEC && HIBERNATION && EXPERIMENTAL
help
Jump between original kernel and kexeced kernel and invoke
code via KEXEC

config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
Expand Down
32 changes: 27 additions & 5 deletions trunk/arch/sh/kernel/machine_kexec.c
Original file line number Diff line number Diff line change
Expand Up @@ -14,20 +14,21 @@
#include <linux/delay.h>
#include <linux/reboot.h>
#include <linux/numa.h>
#include <linux/suspend.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/mmu_context.h>
#include <asm/io.h>
#include <asm/cacheflush.h>

typedef NORET_TYPE void (*relocate_new_kernel_t)(
unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address) ATTRIB_NORET;
typedef void (*relocate_new_kernel_t)(unsigned long indirection_page,
unsigned long reboot_code_buffer,
unsigned long start_address);

extern const unsigned char relocate_new_kernel[];
extern const unsigned int relocate_new_kernel_size;
extern void *gdb_vbr_vector;
extern void *vbr_base;

void machine_shutdown(void)
{
Expand Down Expand Up @@ -72,7 +73,6 @@ static void kexec_info(struct kimage *image)
*/
void machine_kexec(struct kimage *image)
{

unsigned long page_list;
unsigned long reboot_code_buffer;
relocate_new_kernel_t rnk;
Expand All @@ -92,6 +92,11 @@ void machine_kexec(struct kimage *image)
*ptr = (unsigned long) phys_to_virt(*ptr);
}

#ifdef CONFIG_KEXEC_JUMP
if (image->preserve_context)
save_processor_state();
#endif

/* Interrupts aren't acceptable while we reboot */
local_irq_disable();

Expand All @@ -117,6 +122,23 @@ void machine_kexec(struct kimage *image)
/* now call it */
rnk = (relocate_new_kernel_t) reboot_code_buffer;
(*rnk)(page_list, reboot_code_buffer, image->start);

#ifdef CONFIG_KEXEC_JUMP
asm volatile("ldc %0, vbr" : : "r" (&vbr_base) : "memory");
local_irq_disable();
clear_bl_bit();
if (image->preserve_context)
restore_processor_state();

/* Convert page list back to physical addresses, what a mess. */
for (ptr = &image->head; (entry = *ptr) && !(entry & IND_DONE);
ptr = (*ptr & IND_INDIRECTION) ?
phys_to_virt(*ptr & PAGE_MASK) : ptr + 1) {
if (*ptr & IND_SOURCE || *ptr & IND_INDIRECTION ||
*ptr & IND_DESTINATION)
*ptr = virt_to_phys(*ptr);
}
#endif
}

void arch_crash_save_vmcoreinfo(void)
Expand Down
195 changes: 168 additions & 27 deletions trunk/arch/sh/kernel/relocate_kernel.S
Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,8 @@
*
* LANDISK/sh4 is supported. Maybe, SH archtecture works well.
*
* 2009-03-18 Magnus Damm - Added Kexec Jump support
*
* This source code is licensed under the GNU General Public License,
* Version 2. See the file COPYING for more details.
*/
Expand All @@ -17,14 +19,135 @@ relocate_new_kernel:
/* r5 = reboot_code_buffer */
/* r6 = start_address */

mov.l 10f,r8 /* PAGE_SIZE */
mov.l 10f, r0 /* PAGE_SIZE */
add r5, r0 /* setup new stack at end of control page */

/* save r15->r8 to new stack */
mov.l r15, @-r0
mov r0, r15
mov.l r14, @-r15
mov.l r13, @-r15
mov.l r12, @-r15
mov.l r11, @-r15
mov.l r10, @-r15
mov.l r9, @-r15
mov.l r8, @-r15

/* save other random registers */
sts.l macl, @-r15
sts.l mach, @-r15
stc.l gbr, @-r15
stc.l ssr, @-r15
stc.l sr, @-r15
sts.l pr, @-r15
stc.l spc, @-r15

/* switch to bank1 and save r7->r0 */
mov.l 12f, r9
stc sr, r8
or r9, r8
ldc r8, sr
mov.l r7, @-r15
mov.l r6, @-r15
mov.l r5, @-r15
mov.l r4, @-r15
mov.l r3, @-r15
mov.l r2, @-r15
mov.l r1, @-r15
mov.l r0, @-r15

/* switch to bank0 and save r7->r0 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr
mov.l r7, @-r15
mov.l r6, @-r15
mov.l r5, @-r15
mov.l r4, @-r15
mov.l r3, @-r15
mov.l r2, @-r15
mov.l r1, @-r15
mov.l r0, @-r15

mov.l r4, @-r15 /* save indirection page again */

bsr swap_pages /* swap pages before jumping to new kernel */
nop

mova 11f, r0
mov.l r15, @r0 /* save pointer to stack */

jsr @r6 /* hand over control to new kernel */
nop

mov.l 11f, r15 /* get pointer to stack */
mov.l @r15+, r4 /* restore r4 to get indirection page */

/* stack setting */
add r8,r5
mov r5,r15
bsr swap_pages /* swap pages back to previous state */
nop

/* make sure bank0 is active and restore r0->r7 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
mov.l @r15+, r3
mov.l @r15+, r4
mov.l @r15+, r5
mov.l @r15+, r6
mov.l @r15+, r7

/* switch to bank1 and restore r0->r7 */
mov.l 12f, r9
stc sr, r8
or r9, r8
ldc r8, sr
mov.l @r15+, r0
mov.l @r15+, r1
mov.l @r15+, r2
mov.l @r15+, r3
mov.l @r15+, r4
mov.l @r15+, r5
mov.l @r15+, r6
mov.l @r15+, r7

/* switch back to bank0 */
mov.l 12f, r9
not r9, r9
stc sr, r8
and r9, r8
ldc r8, sr

/* restore other random registers */
ldc.l @r15+, spc
lds.l @r15+, pr
ldc.l @r15+, sr
ldc.l @r15+, ssr
ldc.l @r15+, gbr
lds.l @r15+, mach
lds.l @r15+, macl

/* restore r8->r15 */
mov.l @r15+, r8
mov.l @r15+, r9
mov.l @r15+, r10
mov.l @r15+, r11
mov.l @r15+, r12
mov.l @r15+, r13
mov.l @r15+, r14
mov.l @r15+, r15
rts
nop

swap_pages:
bra 1f
mov r4,r0 /* cmd = indirection_page */
mov r4,r0 /* cmd = indirection_page */
0:
mov.l @r4+,r0 /* cmd = *ind++ */

Expand All @@ -37,52 +160,70 @@ relocate_new_kernel:
tst #1,r0
bt 2f
bra 0b
mov r2,r5
mov r2,r5

2: /* else if(cmd & IND_INDIRECTION) ind = addr */
tst #2,r0
bt 3f
bra 0b
mov r2,r4
mov r2,r4

3: /* else if(cmd & IND_DONE) goto 6 */
3: /* else if(cmd & IND_DONE) return */
tst #4,r0
bt 4f
bra 6f
nop
rts
nop

4: /* else if(cmd & IND_SOURCE) memcpy(dst,addr,PAGE_SIZE) */
tst #8,r0
bt 0b

mov r8,r3
mov.l 10f,r3 /* PAGE_SIZE */
shlr2 r3
shlr2 r3
5:
dt r3
mov.l @r2+,r1 /* 16n+0 */
mov.l r1,@r5
add #4,r5
mov.l @r2+,r1 /* 16n+4 */
mov.l r1,@r5
add #4,r5
mov.l @r2+,r1 /* 16n+8 */
mov.l r1,@r5
add #4,r5
mov.l @r2+,r1 /* 16n+12 */
mov.l r1,@r5
add #4,r5

/* regular kexec just overwrites the destination page
* with the contents of the source page.
* for the kexec jump case we need to swap the contents
* of the pages.
* to keep it simple swap the contents for both cases.
*/
mov.l @(0, r2), r8
mov.l @(0, r5), r1
mov.l r8, @(0, r5)
mov.l r1, @(0, r2)

mov.l @(4, r2), r8
mov.l @(4, r5), r1
mov.l r8, @(4, r5)
mov.l r1, @(4, r2)

mov.l @(8, r2), r8
mov.l @(8, r5), r1
mov.l r8, @(8, r5)
mov.l r1, @(8, r2)

mov.l @(12, r2), r8
mov.l @(12, r5), r1
mov.l r8, @(12, r5)
mov.l r1, @(12, r2)

add #16,r5
add #16,r2
bf 5b

bra 0b
nop
6:
jmp @r6
nop
nop

.align 2
10:
.long PAGE_SIZE
11:
.long 0
12:
.long 0x20000000 ! RB=1

relocate_new_kernel_end:

Expand Down

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