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ca8b5d97d6
linux/arch/arm/kernel
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Nicolas Pitre ca8b5d97d6 ARM: XIP kernel: store .data compressed in ROM 
The .data segment stored in ROM is only copied to RAM once at boot time
and never referenced afterwards. This is arguably a suboptimal usage of
ROM resources.

This patch allows for compressing the .data segment before storing it
into ROM and decompressing it to RAM rather than simply copying it,
saving on precious ROM space.

Because global data is not available yet (obviously) we must allocate
decompressor workspace memory on the stack. The .bss area is used as a
stack area for that purpose before it is cleared. The required stack
frame is 9568 bytes for __inflate_kernel_data() alone, so make sure
the .bss is large enough to cope with that plus extra room for called
functions or fail the build.

Those numbers were picked arbitrarily based on the above 9568 byte
stack frame:

10240 (2.5 * PAGE_SIZE): used to override -Wframe-larger-than whose
default value is 1024.
12288 (3 * PAGE_SIZE): minimum .bss size to contain the stack.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Chris Brandt <Chris.Brandt@renesas.com>
2017-09-10 19:34:53 -04:00
..
.gitignore
arch_timer.c
armksyms.c arm: kernel: Add SMC structure parameter 2017-02-03 18:46:33 +00:00
asm-offsets.c ARM: save and reset the address limit when entering an exception 2016-07-07 16:01:01 +01:00
atags_compat.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags_parse.c ARM: fix rd_size declaration 2017-07-10 16:32:34 -07:00
atags_proc.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
atags.h ARM: 8495/1: ATAGS: move save_atags() to arch/arm/include/asm/setup.h 2016-01-04 11:26:00 +00:00
bios32.c ARM/PCI: Fix pcibios_init_resource() struct pci_host_bridge leak 2017-07-10 09:33:14 -05:00
cpuidle.c ARM: 8595/2: apply more __ro_after_init 2016-08-12 16:47:06 +01:00
crash_dump.c
debug.S ARM: unify MMU/!MMU addruart calls 2015-05-20 23:09:51 +02:00
devtree.c ARM: 8616/1: dt: Respect property size when parsing CPUs 2016-09-29 16:57:43 +01:00
dma-isa.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
dma.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
early_printk.c
efi.c ARM/efi: Apply strict permissions for UEFI Runtime Services regions 2016-04-28 11:33:53 +02:00
elf.c
entry-armv.S ARM: Prepare for randomized task_struct 2017-06-30 12:00:50 -07:00
entry-common.S ARM: convert to generated system call tables 2016-10-18 21:34:06 +01:00
entry-ftrace.S ARM: 8678/1: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS 2017-06-18 22:25:16 +01:00
entry-header.S ARM: save and reset the address limit when entering an exception 2016-07-07 16:01:01 +01:00
entry-v7m.S ARM: rename S_FRAME_SIZE to PT_REGS_SIZE 2016-06-22 19:54:28 +01:00
fiq.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
fiqasm.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
ftrace.c ARM: 8678/1: ftrace: Adds support for CONFIG_DYNAMIC_FTRACE_WITH_REGS 2017-06-18 22:25:16 +01:00
head-common.S ARM: XIP kernel: store .data compressed in ROM 2017-09-10 19:34:53 -04:00
head-inflate-data.c ARM: XIP kernel: store .data compressed in ROM 2017-09-10 19:34:53 -04:00
head-nommu.S ARM: 8649/2: nommu: remove Hivecs configuration is asm 2017-02-28 11:06:15 +00:00
head.S Revert "arm: move exports to definitions" 2016-11-23 10:00:03 +00:00
hibernate.c ARM: use virt_to_idmap() for soft_restart() 2016-02-08 15:48:32 +00:00
hw_breakpoint.c ARM/hw_breakpoint: Fix possible recursive locking for arch_hw_breakpoint_init 2017-06-20 12:25:22 +02:00
hyp-stub.S ARM: hyp-stub: Fix Thumb-2 compilation 2017-04-20 12:58:53 +02:00
insn.c
io.c ARM: io.c: clean up EXPORT_SYMBOL()s 2014-11-21 15:25:02 +00:00
irq.c ARM: 8499/1: irq: l2c: do not print error in case of missing l2c from 2016-01-26 23:49:02 +00:00
isa.c arm: convert use of typedef ctl_table to struct ctl_table 2014-06-06 16:08:15 -07:00
iwmmxt.S ARM: 8221/1: PJ4: allow building in Thumb-2 mode 2014-12-03 16:08:00 +00:00
jump_label.c jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP} 2015-08-03 11:34:12 +02:00
kgdb.c scripts/spelling.txt: add regsiter -> register spelling mistake 2017-05-08 17:15:13 -07:00
machine_kexec.c ARM: kexec: fix failure to boot crash kernel 2017-07-20 11:37:42 +01:00
Makefile ARM: XIP kernel: store .data compressed in ROM 2017-09-10 19:34:53 -04:00
module-plts.c ARM: 8662/1: module: split core and init PLT sections 2017-03-17 10:01:28 +00:00
module.c ARM: Silence first allocation with CONFIG_ARM_MODULE_PLTS=y 2017-05-11 14:43:31 +01:00
module.lds ARM: 8662/1: module: split core and init PLT sections 2017-03-17 10:01:28 +00:00
opcodes.c
paravirt.c arm: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops 2015-12-21 14:40:54 +00:00
patch.c arm: Prevent hotplug rwsem recursion 2017-05-26 10:10:46 +02:00
perf_callchain.c perf core: Add a 'nr' field to perf_event_callchain_context 2016-05-16 23:11:51 -03:00
perf_event_v6.c arm: perf: make of_device_ids const 2017-06-15 11:07:34 +01:00
perf_event_v7.c arm: perf: use builtin_platform_driver 2017-02-03 18:46:42 +00:00
perf_event_xscale.c arm: perf: use builtin_platform_driver 2017-02-03 18:46:42 +00:00
perf_regs.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
pj4-cp0.c ARM: 8452/3: PJ4: make coprocessor access sequences buildable in Thumb2 mode 2016-01-04 11:12:10 +00:00
process.c ARM: 8683/1: ARM32: Support mremap() for sigpage/vDSO 2017-06-21 13:02:58 +01:00
psci_smp.c ARM: use const and __initconst for smp_operations 2015-12-01 22:17:45 +01:00
ptrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
reboot.c ARM: soft-reboot into same mode that we entered the kernel 2017-04-09 07:49:24 -07:00
reboot.h ARM: move reboot code to arch/arm/kernel/reboot.c 2015-04-02 09:50:45 +01:00
relocate_kernel.S ARM: convert all "mov.* pc, reg" to "bx reg" for ARMv6+ 2014-07-18 12:29:04 +01:00
return_address.c ARM: 8328/1: remove empty preprocessor #else branch 2015-03-28 16:54:53 +00:00
setup.c ARM: kexec: avoid allocating crashkernel region outside lowmem 2017-07-20 11:37:15 +01:00
signal.c ARM: 8687/1: signal: Fix unparseable iwmmxt_sigframe in uc_regspace[] 2017-07-24 14:26:55 +01:00
sigreturn_codes.S
sleep.S ARM: fix new BSYM() usage introduced via for-arm-soc branch 2015-06-12 21:19:35 +01:00
smccc-call.S arm: kernel: Add SMC structure parameter 2017-02-03 18:46:33 +00:00
smp_scu.c ARM: 8122/1: smp_scu: enable SCU standby support 2014-08-02 08:51:53 +01:00
smp_tlb.c ARM: 8613/1: Fix the uaccess crash on PB11MPCore 2017-01-16 17:30:46 +00:00
smp_twd.c clocksource/drivers: Rename CLOCKSOURCE_OF_DECLARE to TIMER_OF_DECLARE 2017-06-14 11:58:45 +02:00
smp.c arm: Adjust system_state check 2017-05-23 10:01:35 +02:00
stacktrace.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/debug.h> 2017-03-02 08:42:34 +01:00
suspend.c sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
swp_emulate.c sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h> 2017-03-02 08:42:37 +01:00
sys_arm.c
sys_oabi-compat.c sched/headers: Prepare to remove <linux/cred.h> inclusion from <linux/sched.h> 2017-03-02 08:42:31 +01:00
tcm.c ARM: 8388/1: tcm: Don't crash when TCM banks are protected by TrustZone 2015-06-06 10:37:28 +01:00
thumbee.c ARM: convert printk(KERN_* to pr_* 2014-11-21 15:24:50 +00:00
time.c clocksource/drivers: Rename clocksource_probe to timer_probe 2017-06-14 11:59:16 +02:00
topology.c arm,arm64,drivers: add a prefix to drivers arch_topology interfaces 2017-06-03 19:10:09 +09:00
traps.c sched/headers: Prepare for new header dependencies before moving code to <linux/sched/task_stack.h> 2017-03-02 08:42:36 +01:00
unwind.c ARM: 8176/1: Use current_stack_pointer in unwind_backtrace 2014-11-13 23:58:09 +00:00
v7m.c
vdso.c ARM: 8683/1: ARM32: Support mremap() for sigpage/vDSO 2017-06-21 13:02:58 +01:00
vmlinux-xip.lds.S ARM: XIP kernel: store .data compressed in ROM 2017-09-10 19:34:53 -04:00
vmlinux.lds.S ARM: vmlinux.lds.S: replace open coded .data sections with generic macros 2017-09-10 19:34:52 -04:00
xscale-cp0.c ARM: make xscale iwmmxt code multiplatform aware 2015-12-01 21:44:24 +01:00