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2021-02-21arch: setup PF_IO_WORKER threads like PF_KTHREADJens Axboe1-1/+1
PF_IO_WORKER are kernel threads too, but they aren't PF_KTHREAD in the sense that we don't assign ->set_child_tid with our own structure. Just ensure that every arch sets up the PF_IO_WORKER threads like kthreads in the arch implementation of copy_thread(). Signed-off-by: Jens Axboe <[email protected]>
2021-02-22arch: syscalls: remove $(srctree)/ prefix from syscall tablesMasahiro Yamada1-3/+3
The 'syscall' variables are not directly used in the commands. Remove the $(srctree)/ prefix because we can rely on VPATH. Signed-off-by: Masahiro Yamada <[email protected]>
2021-02-22arch: syscalls: add missing FORCE and fix 'targets' to make if_changed workMasahiro Yamada1-13/+14
The rules in these Makefiles cannot detect the command line change because the prerequisite 'FORCE' is missing. Adding 'FORCE' will result in the headers being rebuilt every time because the 'targets' additions are also wrong; the file paths in 'targets' must be relative to the current Makefile. Fix all of them so the if_changed rules work correctly. Signed-off-by: Masahiro Yamada <[email protected]> Acked-by: Geert Uytterhoeven <[email protected]>
2021-02-21Merge tag 'mips_5.12' of ↵Linus Torvalds25-383/+328
git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux Pull MIPS updates from Thomas Bogendoerfer: - added support for Nintendo N64 - added support for Realtek RTL83XX SoCs - kaslr support for Loongson64 - first steps to get rid of set_fs() - DMA runtime coherent/non-coherent selection cleanup - cleanups and fixes * tag 'mips_5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux: (98 commits) Revert "MIPS: Add basic support for ptrace single step" vmlinux.lds.h: catch more UBSAN symbols into .data MIPS: kernel: Drop kgdb_call_nmi_hook MAINTAINERS: Add git tree for KVM/mips MIPS: Use common way to parse elfcorehdr MIPS: Simplify EVA cache handling Revert "MIPS: kernel: {ftrace,kgdb}: Set correct address limit for cache flushes" MIPS: remove CONFIG_DMA_PERDEV_COHERENT MIPS: remove CONFIG_DMA_MAYBE_COHERENT driver core: lift dma_default_coherent into common code MIPS: refactor the runtime coherent vs noncoherent DMA indicators MIPS/alchemy: factor out the DMA coherent setup MIPS/malta: simplify plat_setup_iocoherency MIPS: Add basic support for ptrace single step MAINTAINERS: replace non-matching patterns for loongson{2,3} MIPS: Make check condition for SDBBP consistent with EJTAG spec mips: Replace lkml.org links with lore Revert "MIPS: microMIPS: Fix the judgment of mm_jr16_op and mm_jalr_op" MIPS: crash_dump.c: Simplify copy_oldmem_page() Revert "mips: Manually call fdt_init_reserved_mem() method" ...
2021-02-21Merge branch 'work.elf-compat' of ↵Linus Torvalds4-232/+3
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull ELF compat updates from Al Viro: "Sanitizing ELF compat support, especially for triarch architectures: - X32 handling cleaned up - MIPS64 uses compat_binfmt_elf.c both for O32 and N32 now - Kconfig side of things regularized Eventually I hope to have compat_binfmt_elf.c killed, with both native and compat built from fs/binfmt_elf.c, with -DELF_BITS={64,32} passed by kbuild, but that's a separate story - not included here" * 'work.elf-compat' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: get rid of COMPAT_ELF_EXEC_PAGESIZE compat_binfmt_elf: don't bother with undef of ELF_ARCH Kconfig: regularize selection of CONFIG_BINFMT_ELF mips compat: switch to compat_binfmt_elf.c mips: don't bother with ELF_CORE_EFLAGS mips compat: don't bother with ELF_ET_DYN_BASE mips: KVM_GUEST makes no sense for 64bit builds... mips: kill unused definitions in binfmt_elf[on]32.c mips binfmt_elf*32.c: use elfcore-compat.h x32: make X32, !IA32_EMULATION setups able to execute x32 binaries [amd64] clean PRSTATUS_SIZE/SET_PR_FPVALID up properly elf_prstatus: collect the common part (everything before pr_reg) into a struct binfmt_elf: partially sanitize PRSTATUS_SIZE and SET_PR_FPVALID
2021-02-18Revert "MIPS: Add basic support for ptrace single step"Thomas Bogendoerfer2-109/+1
This reverts commit 7c86ff9925cbc83e8a21f164a8fdc2767e03531e. There are too many special cases for MIPS not covered by this patch. In the end it might be better to implement single stepping in userland than emulating it in the kernel. Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-15MIPS: kernel: Drop kgdb_call_nmi_hookThomas Bogendoerfer1-5/+0
With the removal of set_fs() calls kgdb_call_nmi_hook() is now the same as the default implementation, so we can remove it. Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-13MIPS: Use common way to parse elfcorehdrJinyang He1-28/+21
"elfcorehdr" can be parsed at kernel/crash_dump.c Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-13Revert "MIPS: kernel: {ftrace,kgdb}: Set correct address limit for cache ↵Thomas Bogendoerfer2-21/+1
flushes" This reverts commit 6ebda44f366478d1eea180d93154e7d97b591f50. All icache flushes in this code paths are done via flush_icache_range(), which only uses normal cache instruction. And this is the correct thing for EVA mode, too. So no need to do set_fs(KERNEL_DS) here. Signed-off-by: Thomas Bogendoerfer <[email protected]> Reviewed-by: Christoph Hellwig <[email protected]>
2021-02-13MIPS: remove CONFIG_DMA_MAYBE_COHERENTChristoph Hellwig1-1/+1
CONFIG_DMA_MAYBE_COHERENT just guards two early init options now. Just enable them unconditionally for CONFIG_DMA_NONCOHERENT. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-13driver core: lift dma_default_coherent into common codeChristoph Hellwig1-4/+0
Lift the dma_default_coherent variable from the mips architecture code to the driver core. This allows an architecture to sdefault all device to be DMA coherent at run time, even if the kernel is build with support for DMA noncoherent device. By allowing device_initialize to set the ->dma_coherent field to this default the amount of arch hooks required for this behavior can be greatly reduced. Signed-off-by: Christoph Hellwig <[email protected]> Acked-by: Greg Kroah-Hartman <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-13MIPS: refactor the runtime coherent vs noncoherent DMA indicatorsChristoph Hellwig1-6/+4
Replace the global coherentio enum, and the hw_coherentio (fake) boolean variables with a single boolean dma_default_coherent flag. Signed-off-by: Christoph Hellwig <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-13MIPS: Add basic support for ptrace single stepTiezhu Yang2-1/+109
In the current code, arch_has_single_step() is not defined on MIPS, that means MIPS does not support instruction single-step for user mode. Delve is a debugger for the Go programming language, the ptrace syscall PtraceSingleStep() failed [1] on MIPS and then the single step function can not work well, we can see that PtraceSingleStep() definition returns ptrace(PTRACE_SINGLESTEP) [2]. So it is necessary to support ptrace single step on MIPS. At the beginning, we try to use the Debug Single Step exception on the Loongson 3A4000 platform, but it has no effect when set CP0_DEBUG SSt bit, this is because CP0_DEBUG NoSSt bit is 1 which indicates no single-step feature available [3], so this way which is dependent on the hardware is almost impossible. With further research, we find out there exists a common way used with break instruction in arch/alpha/kernel/ptrace.c, it is workable. For the above analysis, define arch_has_single_step(), add the common function user_enable_single_step() and user_disable_single_step(), set flag TIF_SINGLESTEP for child process, use break instruction to set breakpoint. We can use the following testcase to test it: tools/testing/selftests/breakpoints/step_after_suspend_test.c $ make -C tools/testing/selftests TARGETS=breakpoints $ cd tools/testing/selftests/breakpoints Without this patch: $ ./step_after_suspend_test -n TAP version 13 1..4 # ptrace(PTRACE_SINGLESTEP) not supported on this architecture: Input/output error ok 1 # SKIP CPU 0 # ptrace(PTRACE_SINGLESTEP) not supported on this architecture: Input/output error ok 2 # SKIP CPU 1 # ptrace(PTRACE_SINGLESTEP) not supported on this architecture: Input/output error ok 3 # SKIP CPU 2 # ptrace(PTRACE_SINGLESTEP) not supported on this architecture: Input/output error ok 4 # SKIP CPU 3 # Totals: pass:0 fail:0 xfail:0 xpass:0 skip:4 error:0 With this patch: $ ./step_after_suspend_test -n TAP version 13 1..4 ok 1 CPU 0 ok 2 CPU 1 ok 3 CPU 2 ok 4 CPU 3 # Totals: pass:4 fail:0 xfail:0 xpass:0 skip:0 error:0 [1] https://github.com/go-delve/delve/blob/master/pkg/proc/native/threads_linux.go#L50 [2] https://github.com/go-delve/delve/blob/master/vendor/golang.org/x/sys/unix/syscall_linux.go#L1573 [3] http://www.t-es-t.hu/download/mips/md00047f.pdf Reported-by: Guoqi Chen <[email protected]> Signed-off-by: Xingxing Su <[email protected]> Signed-off-by: Tiezhu Yang <[email protected]> Reported-by: kernel test robot <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-11MIPS: Make check condition for SDBBP consistent with EJTAG specTiezhu Yang1-2/+2
According to MIPS EJTAG Specification [1], a Debug Breakpoint exception occurs when an SDBBP instruction is executed, the CP0_DEBUG bit DBp indicates that a Debug Breakpoint exception occurred. When I read the original code, it looks a little confusing at first glance, just check bit DBp for SDBBP to make the code more readable, it will be much easier to understand. [1] http://www.t-es-t.hu/download/mips/md00047f.pdf Signed-off-by: Tiezhu Yang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09Revert "MIPS: microMIPS: Fix the judgment of mm_jr16_op and mm_jalr_op"Thomas Bogendoerfer1-3/+3
This reverts commit 9308579fef3ddde19da9d45e23bf36d41932417f. Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09MIPS: crash_dump.c: Simplify copy_oldmem_page()Youling Tang1-35/+6
Replace kmap_atomic_pfn() with kmap_local_pfn() which is preemptible and can take page faults. Remove the indirection of the dump page and the related cruft which is not longer required. Remove unused or redundant header files. Signed-off-by: Youling Tang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09Revert "mips: Manually call fdt_init_reserved_mem() method"Serge Semin1-3/+0
This reverts commit 3751cbda8f223549d7ea28803cbec8ac87e43ed2. Originally the patch was created to fix the reserved-memory DT-node parsing failure on the early stages of the platform memory initialization. That happened due to the two early memory allocators utilization that time: bootmem and memblock. At first the platform-specific memory mapping array was initialized. Then the early_init_fdt_scan_reserved_mem() was called, which couldn't fully parse the "reserved-memory" DT-node since neither memblock nor bootmem allocators hadn't been initialized at that stage, so the fdt_init_reserved_mem() method failed on the memory allocation calls. Only after that the platform-specific memory mapping were used to create proper bootmem and memblock structures and let the early memory allocations work. That's why we had to call the fdt_init_reserved_mem() method one more time to retry the initialization of the features like CMA. The necessity to have that fix was disappeared after the full memblock support had been added to the MIPS kernel and all plat_mem_setup() had been fixed to add the memory regions right into the memblock memory pool. Let's revert that patch then especially after having Paul reported that the second fdt_init_reserved_mem() call causes the reserved memory pool being created twice bigger than implied. Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map") Reported-by: Paul Cercueil <[email protected]> Signed-off-by: Serge Semin <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09MIPS: process: Fix no previous prototype warningJinyang He1-0/+2
unwind_stack_by_address and unwind_stack need <asm/stacktrace.h>. arch_align_stack needs <asm/exec.h> link: https://lists.01.org/hyperkitty/list/[email protected]/thread/ZPL2RRA6RZKRQZI5IGOVLFXN2GVZBN3L/ Reported-by: kernel test robot <[email protected]> Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09MIPS: relocatable: Use __kaslr_offset in show_kernel_relocationJinyang He1-6/+2
The type of the VMLINUX_LOAD_ADDRESS macro is the (unsigned long long) in 32bits kernel but (unsigned long) in the 64-bit kernel. Although there is no error here, avoid using it to calculate kaslr_offset. Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-09MIPS: relocatable: Provide kaslr_offset() to get the kernel offsetJinyang He2-0/+13
Provide kaslr_offset() to get the kernel offset when KASLR is enabled. Error may occur before update_kaslr_offset(), so put it at the end of the offset branch. Fixes: a307a4ce9ecd ("MIPS: Loongson64: Add KASLR support") Reported-by: kernel test robot <[email protected]> Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-04MIPS: kernel: Support extracting off-line stack traces from user-space with perfTiezhu Yang2-1/+69
Add perf_event_mips_regs/perf_reg_value/perf_reg_validate to support features HAVE_PERF_REGS/HAVE_PERF_USER_STACK_DUMP in kernel. [[email protected]: Repick this patch for unwinding userstack backtrace by perf and libunwind on MIPS based CPU.] [[email protected]: Add perf_get_regs_user() which is required after 'commit 88a7c26af8da ("perf: Move task_pt_regs sampling into arch code")'.] [[email protected]: Fix build error about perf_get_regs_user() after commit 76a4efa80900 ("perf/arch: Remove perf_sample_data::regs_user_copy"), and also separate the original patches into two parts (MIPS kernel and perf tools) to merge easily.] The original patches: https://lore.kernel.org/patchwork/patch/1126521/ https://lore.kernel.org/patchwork/patch/1126520/ Signed-off-by: David Daney <[email protected]> Signed-off-by: Ralf Baechle <[email protected]> Signed-off-by: Archer Yan <[email protected]> Signed-off-by: Tiezhu Yang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-02-04MIPS: of: Introduce helper function to get DTBThomas Bogendoerfer2-35/+0
Selection of the DTB to be used was burried in more or less readable code in head.S. Move this code into a inline helper function and use it. Signed-off-by: Thomas Bogendoerfer <[email protected]> Acked-by: Florian Fainelli <[email protected]>
2021-02-03arch: mips: kernel: Fix two spelling in smp.cBhaskar Chowdhury1-3/+3
s/logcal/logical/ s/intercpu/inter-CPU/ Signed-off-by: Bhaskar Chowdhury <[email protected]> Acked-by: Randy Dunlap <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-27MIPS: vpe: Remove vpe_getcwdThomas Bogendoerfer1-33/+0
I couldn't find any user of the dubious vpe_getcwd so far. So remove it and get rid of another set_fs(KERNEL_DS). Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-27mips: cacheinfo: Remove unnecessary increment of levelSouptick Joarder1-3/+1
kernel test robot throws below warning -> arch/mips/kernel/cacheinfo.c:112:3: warning: Variable 'level' is modified but its new value is never used. [unreadVariable] Remove unnecessary increment of level at the end. Reported-by: kernel test robot <[email protected]> Signed-off-by: Souptick Joarder <[email protected]> Reviewed-by: Jiaxun Yang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-25MIPS: Add is_jr_ra_ins() to end the loop earlyJinyang He1-1/+33
For those leaf functions, they are likely to have no stack operations. Add is_jr_ra_ins() to determine whether jr ra has been touched before the frame_size is found. Without this patch, the get frame_size operation may be out of range and get the frame_size from the next nested function. There is no POOL32A format in uapi/asm/inst.h, so some bits here use the format of r_format instead. e.g. --------------------------------------------------------------------- | format | 31:26 | 25:21 | 20:16 | 15:6 | 5:0 | -----------------+---------+-------+-------+------------+------------ | pool32a_format | pool32a | rt | rs | jalrc | pool32axf | -----------------+---------+-------+-------+------------+------------ | r_format | opcode | rs | rt | rd:5, re:5 | func | --------------------------------------------------------------------- Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-25MIPS: Fix get_frame_info() handing of function sizeJinyang He1-4/+4
[1]: Commit b6c7a324df37b ("MIPS: Fix get_frame_info() handling of microMIPS function size") [2]: Commit 2b424cfc69728 ("MIPS: Remove function size check in get_frame_info()") First patch added a constant to check the number of iterations against. Second patch fixed the situation that info->func_size is zero. However, func_size member became useless after the second commit. Without ip_end, the get frame_size operation may be out of range although KALLSYMS enabled. Thus, check func_size first. Then make ip_end be the sum of ip and a constant (512) if func_size is equal to 0. Otherwise make ip_end be the sum of ip and func_size. Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-25MIPS: microMIPS: Fix the judgment of mm_jr16_op and mm_jalr_opJinyang He1-3/+3
mm16_r5_format.rt is 5 bits, so directly judge the value if equal or not. mm_jalr_op requires 7th to 16th bits. These 10 which bits generated by shifting u_format.uimmediate by 6 may be affected by sign extension. Thus, take out the 10 bits for comparison. Without this patch, errors may occur, such as these bits are all ones. Signed-off-by: Jinyang He <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-25MIPS: process: Remove unnecessary headers inclusionJinyang He1-29/+12
Some headers are not necessary, remove them and sort includes. Signed-off-by: Jinyang He <[email protected]> Reviewed-by: Huacai Chen <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-24fs: add mount_setattr()Christian Brauner3-0/+3
This implements the missing mount_setattr() syscall. While the new mount api allows to change the properties of a superblock there is currently no way to change the properties of a mount or a mount tree using file descriptors which the new mount api is based on. In addition the old mount api has the restriction that mount options cannot be applied recursively. This hasn't changed since changing mount options on a per-mount basis was implemented in [1] and has been a frequent request not just for convenience but also for security reasons. The legacy mount syscall is unable to accommodate this behavior without introducing a whole new set of flags because MS_REC | MS_REMOUNT | MS_BIND | MS_RDONLY | MS_NOEXEC | [...] only apply the mount option to the topmost mount. Changing MS_REC to apply to the whole mount tree would mean introducing a significant uapi change and would likely cause significant regressions. The new mount_setattr() syscall allows to recursively clear and set mount options in one shot. Multiple calls to change mount options requesting the same changes are idempotent: int mount_setattr(int dfd, const char *path, unsigned flags, struct mount_attr *uattr, size_t usize); Flags to modify path resolution behavior are specified in the @flags argument. Currently, AT_EMPTY_PATH, AT_RECURSIVE, AT_SYMLINK_NOFOLLOW, and AT_NO_AUTOMOUNT are supported. If useful, additional lookup flags to restrict path resolution as introduced with openat2() might be supported in the future. The mount_setattr() syscall can be expected to grow over time and is designed with extensibility in mind. It follows the extensible syscall pattern we have used with other syscalls such as openat2(), clone3(), sched_{set,get}attr(), and others. The set of mount options is passed in the uapi struct mount_attr which currently has the following layout: struct mount_attr { __u64 attr_set; __u64 attr_clr; __u64 propagation; __u64 userns_fd; }; The @attr_set and @attr_clr members are used to clear and set mount options. This way a user can e.g. request that a set of flags is to be raised such as turning mounts readonly by raising MOUNT_ATTR_RDONLY in @attr_set while at the same time requesting that another set of flags is to be lowered such as removing noexec from a mount tree by specifying MOUNT_ATTR_NOEXEC in @attr_clr. Note, since the MOUNT_ATTR_<atime> values are an enum starting from 0, not a bitmap, users wanting to transition to a different atime setting cannot simply specify the atime setting in @attr_set, but must also specify MOUNT_ATTR__ATIME in the @attr_clr field. So we ensure that MOUNT_ATTR__ATIME can't be partially set in @attr_clr and that @attr_set can't have any atime bits set if MOUNT_ATTR__ATIME isn't set in @attr_clr. The @propagation field lets callers specify the propagation type of a mount tree. Propagation is a single property that has four different settings and as such is not really a flag argument but an enum. Specifically, it would be unclear what setting and clearing propagation settings in combination would amount to. The legacy mount() syscall thus forbids the combination of multiple propagation settings too. The goal is to keep the semantics of mount propagation somewhat simple as they are overly complex as it is. The @userns_fd field lets user specify a user namespace whose idmapping becomes the idmapping of the mount. This is implemented and explained in detail in the next patch. [1]: commit 2e4b7fcd9260 ("[PATCH] r/o bind mounts: honor mount writer counts at remount") Link: https://lore.kernel.org/r/[email protected] Cc: David Howells <[email protected]> Cc: Aleksa Sarai <[email protected]> Cc: Al Viro <[email protected]> Cc: [email protected] Cc: [email protected] Reviewed-by: Christoph Hellwig <[email protected]> Signed-off-by: Christian Brauner <[email protected]>
2021-01-22Revert "MIPS: Remove unused R4300 CPU support"Lauri Kasanen2-0/+10
This reverts commit f9065b54d437c4660e3d974ad9ce5188c068cd76. We're adding Nintendo 64 support, so the VR4300 is no longer unused. Signed-off-by: Lauri Kasanen <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-18MIPS: relocatable: optimize the relocation processAlexander Lobakin1-24/+30
For now, vmlinux relocation functions for relocatable kernel are implemented as an array of handlers of a particular type. Convert that array into a single switch-case function to: - remove unused arguments; - change the return type of simple handlers to void; - remove the array and don't use any data at all; - avoid using indirect calls; - allow the compiler to inline and greatly optimize the relocation function[s]; and also mark do_relocations() and show_kernel_relocation() static as they aren't used anywhere else. The result on MIPS32 R2 with GCC 10.2 -O2 is: scripts/bloat-o-meter -c arch/mips/kernel/__relocate.o arch/mips/kernel/relocate.o add/remove: 0/6 grow/shrink: 1/0 up/down: 356/-640 (-284) Function old new delta relocate_kernel 852 1208 +356 apply_r_mips_32_rel 20 - -20 apply_r_mips_hi16_rel 40 - -40 apply_r_mips_64_rel 44 - -44 apply_r_mips_26_rel 144 - -144 show_kernel_relocation 164 - -164 do_relocations 228 - -228 Total: Before=1780, After=1496, chg -15.96% add/remove: 0/1 grow/shrink: 0/0 up/down: 0/-76 (-76) Data old new delta reloc_handlers_rel 76 - -76 Total: Before=92, After=16, chg -82.61% add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0) RO Data old new delta Total: Before=0, After=0, chg +0.00% All functions were collapsed into the main one, relocate_kernel(). Signed-off-by: Alexander Lobakin <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-18MIPS: module: optimize module relocations processingAlexander Lobakin1-57/+52
For now, module relocation functions are implemented as an array of handlers of type reloc_handler_t. Convert that array into a single switch-case function to: - remove unused arguments; - change the return type of simple handlers to void; - remove the array and don't use any data at all; - avoid using indirect calls; - allow the compiler to inline and greatly optimize the relocation function[s]. The result on MIPS32 R2 with GCC 10.2 -O2 is: scripts/bloat-o-meter -c arch/mips/kernel/__module.o arch/mips/kernel/module.o add/remove: 1/11 grow/shrink: 1/0 up/down: 876/-1436 (-560) Function old new delta apply_relocate 456 1148 +692 apply_r_mips_pc - 184 +184 apply_r_mips_none 8 - -8 apply_r_mips_32 16 - -16 apply_r_mips_64 76 - -76 apply_r_mips_highest 88 - -88 apply_r_mips_higher 108 - -108 apply_r_mips_26 132 - -132 apply_r_mips_pc26 160 - -160 apply_r_mips_pc21 160 - -160 apply_r_mips_pc16 160 - -160 apply_r_mips_hi16 172 - -172 apply_r_mips_lo16 356 - -356 Total: Before=2608, After=2048, chg -21.47% add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0 (0) Data old new delta Total: Before=12, After=12, chg +0.00% add/remove: 0/1 grow/shrink: 0/0 up/down: 0/-248 (-248) RO Data old new delta reloc_handlers 248 - -248 Total: Before=248, After=0, chg -100.00% All functions were collapsed into a single one that is called directly by $(srctree)/kernel/module.c. Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Jiaxun Yang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-18MIPS: Ingenic: Disable HPTLB for D0 XBurst CPUs tooPaul Cercueil1-7/+8
The JZ4760 has the HPTLB as well, but has a XBurst CPU with a D0 CPUID. Disable the HPTLB for all XBurst CPUs with a D0 CPUID. In the case where there is no HPTLB (e.g. for older SoCs), this won't have any side effect. Fixes: b02efeb05699 ("MIPS: Ingenic: Disable abandoned HPTLB function.") Cc: <[email protected]> # 5.4 Signed-off-by: Paul Cercueil <[email protected]> Reviewed-by: 周琰杰 (Zhou Yanjie) <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: vmlinux.lds.S: explicitly declare .got tableAlexander Lobakin1-0/+2
LLVM stack generates GOT table when building the kernel: ld.lld: warning: <internal>:(.got) is being placed in '.got' According to the debug assertions, it's not zero-sized and thus can't be handled the way it's done for x86. Also use the ARM64 path here and place it at the end of .text section. Reported-by: Nathan Chancellor <[email protected]> Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Kees Cook <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: vmlinux.lds.S: explicitly catch .rel.dyn symbolsAlexander Lobakin1-0/+5
According to linker warnings, both GCC and LLVM generate '.rel.dyn' symbols: mips-alpine-linux-musl-ld: warning: orphan section `.rel.dyn' from `init/main.o' being placed in section `.rel.dyn' Link-time assertion shows that this section is sometimes empty, sometimes not, depending on machine bitness and the compiler [0]: LD .tmp_vmlinux.kallsyms1 mips64-linux-gnu-ld: Unexpected run-time relocations (.rel) detected! Just use the ARM64 approach and declare it in vmlinux.lds.S closer to __init_end. [0] https://lore.kernel.org/linux-mips/[email protected] Reported-by: Thomas Bogendoerfer <[email protected]> Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: properly stop .eh_frame generationAlexander Lobakin1-1/+0
Commit 866b6a89c6d1 ("MIPS: Add DWARF unwinding to assembly") added -fno-asynchronous-unwind-tables to KBUILD_CFLAGS to prevent compiler from emitting .eh_frame symbols. However, as MIPS heavily uses CFI, that's not enough. Use the approach taken for x86 (as it also uses CFI) and explicitly put CFI symbols into the .debug_frame section (except for VDSO). This allows us to drop .eh_frame from DISCARDS as it's no longer being generated. Fixes: 866b6a89c6d1 ("MIPS: Add DWARF unwinding to assembly") Suggested-by: Kees Cook <[email protected]> Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Kees Cook <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: vmlinux.lds.S: add ".gnu.attributes" to DISCARDSAlexander Lobakin1-0/+1
Discard GNU attributes (MIPS FP type, GNU Hash etc.) at link time as kernel doesn't use it at all. Solves a dozen of the following ld warnings (one per every file): mips-alpine-linux-musl-ld: warning: orphan section `.gnu.attributes' from `arch/mips/kernel/head.o' being placed in section `.gnu.attributes' mips-alpine-linux-musl-ld: warning: orphan section `.gnu.attributes' from `init/main.o' being placed in section `.gnu.attributes' Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: CPS: don't create redundant .text.cps-vec sectionAlexander Lobakin2-2/+0
A number of symbols from arch/mips/kernel/cps-vec.S is explicitly placed into '.text.cps-vec' section. There are no direct references to this section, so there's no need to form it. '.balign 0x1000' directive will work anyway. Moreover, this section was being placed in vmlinux differently depending on CONFIG_LD_DEAD_CODE_DATA_ELIMINATION: - with this option enabled, '.text.cps-vec' was being caught by '.text.[0-9a-zA-Z_]*' from include/asm-generic/vmlinux.lds.h; - without this option, '.text.cps-vec' was being caught by discouraging '.text.*' from arch/mips/kernel/vmlinux.lds.S. '.text.*' should not be used in vmlinux linker scripts at all as it silently catches any orphan text sections. So, remove both '.section .text.cps-vec' and '.text.*' from cps-vec.S and vmlinux.lds.S respectively. As said, this does not affect related functions alignment: 80116000 T mips_cps_core_entry 80116028 t not_nmi 80116200 T excep_tlbfill 80116280 T excep_xtlbfill 80116300 T excep_cache 80116380 T excep_genex 80116400 T excep_intex 80116480 T excep_ejtag 80116490 T mips_cps_core_init Signed-off-by: Alexander Lobakin <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-15MIPS: vmlinux.lds.S: add missing PAGE_ALIGNED_DATA() sectionAlexander Lobakin1-0/+1
MIPS uses its own declaration of rwdata, and thus it should be kept in sync with the asm-generic one. Currently PAGE_ALIGNED_DATA() is missing from the linker script, which emits the following ld warnings: mips-alpine-linux-musl-ld: warning: orphan section `.data..page_aligned' from `arch/mips/kernel/vdso.o' being placed in section `.data..page_aligned' mips-alpine-linux-musl-ld: warning: orphan section `.data..page_aligned' from `arch/mips/vdso/vdso-image.o' being placed in section `.data..page_aligned' Add the necessary declaration, so the mentioned structures will be placed in vmlinux as intended: ffffffff80630580 D __end_once ffffffff80630580 D __start___dyndbg ffffffff80630580 D __start_once ffffffff80630580 D __stop___dyndbg ffffffff80634000 d mips_vdso_data ffffffff80638000 d vdso_data ffffffff80638580 D _gp ffffffff8063c000 T __init_begin ffffffff8063c000 D _edata ffffffff8063c000 T _sinittext -> ffffffff805a4000 D __end_init_task ffffffff805a4000 D __nosave_begin ffffffff805a4000 D __nosave_end ffffffff805a4000 d mips_vdso_data ffffffff805a8000 d vdso_data ffffffff805ac000 D mmlist_lock ffffffff805ac080 D tasklist_lock Fixes: ebb5e78cc634 ("MIPS: Initial implementation of a VDSO") Signed-off-by: Alexander Lobakin <[email protected]> Reviewed-by: Kees Cook <[email protected]> Reviewed-by: Nathan Chancellor <[email protected]> Cc: [email protected] # 4.4+ Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-13MIPS: relocatable: fix possible boot hangup with KASLR enabledAlexander Lobakin1-2/+8
LLVM-built Linux triggered a boot hangup with KASLR enabled. arch/mips/kernel/relocate.c:get_random_boot() uses linux_banner, which is a string constant, as a random seed, but accesses it as an array of unsigned long (in rotate_xor()). When the address of linux_banner is not aligned to sizeof(long), such access emits unaligned access exception and hangs the kernel. Use PTR_ALIGN() to align input address to sizeof(long) and also align down the input length to prevent possible access-beyond-end. Fixes: 405bc8fd12f5 ("MIPS: Kernel: Implement KASLR using CONFIG_RELOCATABLE") Cc: [email protected] # 4.7+ Signed-off-by: Alexander Lobakin <[email protected]> Tested-by: Nathan Chancellor <[email protected]> Reviewed-by: Kees Cook <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-07MIPS: UAPI: unexport unistd_nr_{n32,n64,o32}.hAlexander Lobakin1-8/+8
unistd_nr_{n32,n64,o32}.h are needed only by include/asm/unistd.h, which is a kernel-side header file, and their contents is generally not for userland use. Move their target destination from include/generated/uapi/asm/ to include/generated/asm/ to disable exporting them as UAPI headers. Signed-off-by: Alexander Lobakin <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
2021-01-06mips compat: switch to compat_binfmt_elf.cAl Viro4-134/+3
Like amd64, mips has two 32bit ABIs - o32 and n32. Unlike amd64, it does not use compat_binfmt_elf.c for either of those; each of those ABIs has a binfmt handler of its own, both very similar to fs/compat_binfmt_elf.c. And the same technics as we use on amd64 can be used to make fs/compat_binfmt_elf.c handle both. * merge elfo32_check_arch() with elfn32_check_arch(), make that serve as compat_elf_check_arch(). Note that SET_PERSONALITY2() is already the same for all ABI variants - it looks at the elf header to choose the flags to set. * add asm/elfcore-compat.h, using the bigger (n32) variant of elf32_prstatus as compat_elf_prstatus there. * make PRSTATUS_SIZE() and SET_PR_FPVALID() choose the right layout, same as done for amd64. test_thread_flag(TIF_32BIT_REGS) is used as the predicate. Voila - we are rid of binfmt_elf{n,o}32.c; fs/compat_binfmt_elf.c is used, same as for all other ELF-supporting 64bit architectures that need 32bit compat. Signed-off-by: Al Viro <[email protected]>
2021-01-06mips: don't bother with ELF_CORE_EFLAGSAl Viro1-2/+0
mips coredumps are regset-based, so ELF_CORE_EFLAGS is not used at all - user_..._view.e_flags is. Signed-off-by: Al Viro <[email protected]>
2021-01-06mips compat: don't bother with ELF_ET_DYN_BASEAl Viro2-12/+0
normal mips one is just fine - it's only used after we'd done SET_PERSONALITY2() and by that point TASK_SIZE will yield the right value Signed-off-by: Al Viro <[email protected]>
2021-01-06mips: kill unused definitions in binfmt_elf[on]32.cAl Viro2-36/+0
elf_caddr_t: unused since 2002 jiffies_to_timeval: unused since 2015 TASK_SIZE: used only downstream of SET_PERSONALITY2(), and after that point the normal definition results in TASK_SIZE32 just fine. Signed-off-by: Al Viro <[email protected]>
2021-01-06mips binfmt_elf*32.c: use elfcore-compat.hAl Viro2-65/+8
... rather than duplicating declarations from it. Signed-off-by: Al Viro <[email protected]>
2021-01-06Merge remote-tracking branch 'mips/mips-fixes' into work.elf-compatAl Viro2-0/+14
backmerge of mips compat coredump fix
2021-01-06elf_prstatus: collect the common part (everything before pr_reg) into a structAl Viro2-2/+11
Preparations to doing i386 compat elf_prstatus sanely - rather than duplicating the beginning of compat_elf_prstatus, take these fields into a separate structure (compat_elf_prstatus_common), so that it could be reused. Due to the incestous relationship between binfmt_elf.c and compat_binfmt_elf.c we need the same shape change done to native struct elf_prstatus, gathering the fields prior to pr_reg into a new structure (struct elf_prstatus_common). Fortunately, offset of pr_reg is always a multiple of 16 with no padding right before it, so it's possible to turn all the stuff prior to it into a single member without disturbing the layout. [build fix from Geert Uytterhoeven folded in] Signed-off-by: Al Viro <[email protected]>
2021-01-04MIPS: Kill RM7K & RM9K IRQ CodeJiaxun Yang2-46/+0
RM7000 IRQ driver never got really used by any of the platform, and rm9k_cpu_irq_init only exist in a header. Signed-off-by: Jiaxun Yang <[email protected]> Signed-off-by: Thomas Bogendoerfer <[email protected]>
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