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56e62a7370
This patch converts s390 to use the generic entry infrastructure from
kernel/entry/*.
There are a few special things on s390:
- PIF_PER_TRAP is moved to TIF_PER_TRAP as the generic code doesn't
know about our PIF flags in exit_to_user_mode_loop().
- The old code had several ways to restart syscalls:
a) PIF_SYSCALL_RESTART, which was only set during execve to force a
restart after upgrading a process (usually qemu-kvm) to pgste page
table extensions.
b) PIF_SYSCALL, which is set by do_signal() to indicate that the
current syscall should be restarted. This is changed so that
do_signal() now also uses PIF_SYSCALL_RESTART. Continuing to use
PIF_SYSCALL doesn't work with the generic code, and changing it
to PIF_SYSCALL_RESTART makes PIF_SYSCALL and PIF_SYSCALL_RESTART
more unique.
- On s390 calling sys_sigreturn or sys_rt_sigreturn is implemented by
executing a svc instruction on the process stack which causes a fault.
While handling that fault the fault code sets PIF_SYSCALL to hand over
processing to the syscall code on exit to usermode.
The patch introduces PIF_SYSCALL_RET_SET, which is set if ptrace sets
a return value for a syscall. The s390x ptrace ABI uses r2 both for the
syscall number and return value, so ptrace cannot set the syscall number +
return value at the same time. The flag makes handling that a bit easier.
do_syscall() will just skip executing the syscall if PIF_SYSCALL_RET_SET
is set.
CONFIG_DEBUG_ASCE was removd in favour of the generic CONFIG_DEBUG_ENTRY.
CR1/7/13 will be checked both on kernel entry and exit to contain the
correct asces.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
81 lines
2.6 KiB
Makefile
81 lines
2.6 KiB
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for the linux kernel.
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#
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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace tracer code
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CFLAGS_REMOVE_ftrace.o = $(CC_FLAGS_FTRACE)
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# Do not trace early setup code
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CFLAGS_REMOVE_early.o = $(CC_FLAGS_FTRACE)
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endif
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GCOV_PROFILE_early.o := n
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KCOV_INSTRUMENT_early.o := n
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UBSAN_SANITIZE_early.o := n
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KASAN_SANITIZE_ipl.o := n
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KASAN_SANITIZE_machine_kexec.o := n
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#
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# Passing null pointers is ok for smp code, since we access the lowcore here.
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#
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CFLAGS_smp.o := -Wno-nonnull
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#
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# Disable tailcall optimizations for stack / callchain walking functions
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# since this might generate broken code when accessing register 15 and
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# passing its content to other functions.
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#
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CFLAGS_stacktrace.o += -fno-optimize-sibling-calls
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CFLAGS_dumpstack.o += -fno-optimize-sibling-calls
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CFLAGS_unwind_bc.o += -fno-optimize-sibling-calls
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obj-y := traps.o time.o process.o base.o early.o setup.o idle.o vtime.o
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obj-y += processor.o syscall.o ptrace.o signal.o cpcmd.o ebcdic.o nmi.o
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obj-y += debug.o irq.o ipl.o dis.o diag.o vdso.o
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obj-y += sysinfo.o lgr.o os_info.o machine_kexec.o pgm_check.o
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obj-y += runtime_instr.o cache.o fpu.o dumpstack.o guarded_storage.o sthyi.o
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obj-y += entry.o reipl.o relocate_kernel.o kdebugfs.o alternative.o
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obj-y += nospec-branch.o ipl_vmparm.o machine_kexec_reloc.o unwind_bc.o
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obj-y += smp.o
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extra-y += head64.o vmlinux.lds
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obj-$(CONFIG_SYSFS) += nospec-sysfs.o
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CFLAGS_REMOVE_nospec-branch.o += $(CC_FLAGS_EXPOLINE)
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_SCHED_TOPOLOGY) += topology.o
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obj-$(CONFIG_NUMA) += numa.o
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obj-$(CONFIG_AUDIT) += audit.o
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compat-obj-$(CONFIG_AUDIT) += compat_audit.o
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obj-$(CONFIG_COMPAT) += compat_linux.o compat_signal.o
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obj-$(CONFIG_COMPAT) += $(compat-obj-y)
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obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KPROBES) += kprobes_insn_page.o
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obj-$(CONFIG_FUNCTION_TRACER) += mcount.o ftrace.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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obj-$(CONFIG_UPROBES) += uprobes.o
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obj-$(CONFIG_JUMP_LABEL) += jump_label.o
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obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o kexec_image.o
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obj-$(CONFIG_KEXEC_FILE) += kexec_elf.o
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obj-$(CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT) += ima_arch.o
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obj-$(CONFIG_PERF_EVENTS) += perf_event.o perf_cpum_cf_common.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf.o perf_cpum_sf.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_events.o perf_regs.o
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obj-$(CONFIG_PERF_EVENTS) += perf_cpum_cf_diag.o
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obj-$(CONFIG_TRACEPOINTS) += trace.o
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obj-$(findstring y, $(CONFIG_PROTECTED_VIRTUALIZATION_GUEST) $(CONFIG_PGSTE)) += uv.o
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# vdso
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obj-y += vdso64/
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