linux-stable.git/arch/mips/fw, branch master

MIPS: Fix big-endian stack argument fetching in o32 wrapper

2026-05-26T14:35:36+00:00

Fix an issue in call_o32() where the upper 32-bit half of incoming n64
stack arguments is fetched and used for outgoing o32 stack arguments on
big-endian platforms.

This code was adapted from arch/mips/dec/prom/call_o32.S which was meant
for a little-endian platform only and therefore using 32-bit loads from
64-bit stack slot locations holding incoming stack arguments resulted in
correct values being retrieved for data that is expected to be 32-bit.

This works on little-endian platforms where the lower 32-bit half of the
64-bit value is located at every 64-bit stack slot location.  However on
big-endian platforms the lower 32-bit half is instead located at offset
4 from every 64-bit stack slot location.

So to fix the issue the offset of 4 would have to be used on big-endian
platforms only, or alternatively a 64-bit load from the 64-bit stack
slot location can be used across the board, as the subsequent 32-bit
store to the corresponding outgoing stack argument slot will correctly
truncate the value and cause no unpredictable result.  We already take
advantage of this architectural feature for the incoming arguments held
in $a6 and $a7 registers, since the o32 wrapper does not know how many
incoming arguments there are and consequently propagates incoming data
which may not be 32-bit.

Since this code is generally supposed to be used with the stack located
in cached memory there is no extra overhead expected for 64-bit loads as
opposed to 32-bit ones, so pick this variant for code simplicity.

Fixes: 231a35d37293 ("[MIPS] RM: Collected changes")
Signed-off-by: Maciej W. Rozycki 
Signed-off-by: Thomas Bogendoerfer

MIPS: arc: Replace deprecated strcpy() with memcpy()

2025-08-29T20:34:30+00:00

strcpy() is deprecated; use memcpy() instead.

Use pr_debug() instead of printk(KERN_DEBUG) to silence a checkpatch
warning.

Link: https://github.com/KSPP/linux/issues/88
Signed-off-by: Thorsten Blum 
Signed-off-by: Thomas Bogendoerfer

MIPS: fw arc: Fix missing prototypes

2024-01-22T10:12:01+00:00

Make ArcGetMemoryDescriptor() static since it's only needed internally.

Signed-off-by: Thomas Bogendoerfer 
Reviewed-by: Florian Fainelli

MIPS: Fix typos

2024-01-08T09:39:12+00:00

Fix typos, most reported by "codespell arch/mips".  Only touches comments,
no code changes.

Signed-off-by: Bjorn Helgaas 
Cc: linux-mips@vger.kernel.org
Reviewed-by: Randy Dunlap 
Signed-off-by: Thomas Bogendoerfer

MIPS: fw: Allow firmware to pass a empty env

2023-04-12T13:07:36+00:00

fw_getenv will use env entry to determine style of env,
however it is legal for firmware to just pass a empty list.

Check if first entry exist before running strchr to avoid
null pointer dereference.

Cc: stable@vger.kernel.org
Link: https://github.com/clbr/n64bootloader/issues/5
Signed-off-by: Jiaxun Yang 
Signed-off-by: Thomas Bogendoerfer

MIPS: CFE: Add cfe_die()

2022-07-17T12:52:47+00:00

Add a cfe_die() implementation which is useful when the kernel does an
early panic and no console is registered. This allows us to print
useful diagnostics such as an invalid DTB having been
configured/selected.

Since the BMIPS_GENERIC kernel can be built with support for multiple
processors, we need to do a runtime determination of the type of CPU
that we are executing on to perform the appropriate XKS01 disabling.

Since cfe_init() + cfe_die() could be conceivably called at very early
stages of the kernel boot, before cpu_probe(), we do not rely on the
structure(s) populated by cpu_probe().

Signed-off-by: Florian Fainelli 
Signed-off-by: Thomas Bogendoerfer

MIPS: fix typos in comments

2022-05-04T20:22:59+00:00

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall 
Signed-off-by: Thomas Bogendoerfer

MIPS: Remove empty prom_free_prom_memory functions

2021-01-07T16:11:33+00:00

Most of the prom_free_prom_memory functions are empty. With
a new weak prom_free_prom_memory() we can remove all of them.

Signed-off-by: Thomas Bogendoerfer 
Acked-by: Florian Fainelli

MIPS: replace add_memory_region with memblock

2020-10-12T10:01:36+00:00

add_memory_region was the old interface for registering memory and
was already changed to used memblock internaly. Replace it by
directly calling memblock functions.

Signed-off-by: Thomas Bogendoerfer

mips: Return proper error code from console ->setup() hook

2020-06-25T12:20:13+00:00

For unifying console ->setup() handling, which is poorly documented,
return error code, rather than non-zero arbitrary number.

Signed-off-by: Andy Shevchenko 
Reviewed-by: Petr Mladek 
Acked-by: Thomas Bogendoerfer 
Signed-off-by: Petr Mladek 
Link: https://lore.kernel.org/r/20200618164751.56828-2-andriy.shevchenko@linux.intel.com