This series of patches brings in 32-bit arm support for bsd-user. It implements all the bits needed to do image activation, signal handling, stack management and threading. This allows us to get to the "Hello World" level and also to satisfy all linking requirements. I've sliced up the current bsd-user fork versions of all this code into what I hope are right-sized reviewable chunks.
make checkpatch has a couple of complaints about the comments for the signal trampoline: WARNING: Block comments use a leading /* on a separate line + /* 8 */ sys_sigreturn, WARNING: Block comments use a leading /* on a separate line + /* 9 */ sys_exit that I think should be ignored. This also adds stubs necessary for building. V2 improves target_arch_signal.h in a number of ways o match mcontext to FreeBSD/arm kernel (we'd used mips mcontext which was originally copied from arm so things mostly worked) o support thumb execution better (in the fork A32 -> T32 and vice versa, even with signals, not works, here hello T32 and A32 programs now work). o common ucontext now implemented. o patches with substantial changes have had the reviewed by removed. o Also remove target_sigcontext (FreeBSD's old way of doing signals) that was discovered as it appeared unused in arm upstream. o update x86 to use target_os_ucontext.h, though signals aren't yet completely supported in x86. o add cpu_loop_exit_sigsegv and cpu_loop_exit_sigbus stubs that just abort: bsd-user hadn't been updated so this is the first patch in the series. The following still need review: bsd-user/freebsd: Create common target_os_ucontext.h file bsd-user/arm/target_arch_signal.h: arm machine context for signals bsd-user/arm/target_arch_signal.h: arm user context and trapframe for signals bsd-user/arm/target_arch_signal.h: arm set_sigtramp_args bsd-user/arm/target_arch_signal.h: arm get_mcontext bsd-user/arm/target_arch_signal.h: arm set_mcontext bsd-user/i386/target_arch_signal.h: Remove target_sigcontext bsd-user/x86_64/target_arch_signal.h: Remove target_sigcontext bsd-user/i386/target_arch_signal.h: use new target_os_ucontext.h bsd-user/x86_64/target_arch_signal.h: use new target_os_ucontext.h Warner Losh (30): bsd-user: Add stubs for new signal routines bsd-user/arm/target_arch_sysarch.h: Use consistent include guards bsd-user/arm/target_syscall.h: Add copyright and update name bsd-user/arm/target_arch_cpu.c: Target specific TLS routines bsd-user/arm/target_arch_cpu.h: CPU Loop definitions bsd-user/arm/target_arch_cpu.h: Implement target_cpu_clone_regs bsd-user/arm/target_arch_cpu.h: Dummy target_cpu_loop implementation bsd-user/arm/target_arch_cpu.h: Implement trivial EXCP exceptions bsd-user/arm/target_arch_cpu.h: Implement data abort exceptions bsd-user/arm/target_arch_cpu.h: Implement system call dispatch bsd-user/arm/target_arch_reg.h: Implement core dump register copying bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread bsd-user/arm/target_arch_elf.h: arm defines for ELF bsd-user/arm/target_arch_elf.h: arm get hwcap bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl bsd-user/freebsd: Create common target_os_ucontext.h file bsd-user/arm/target_arch_signal.h: arm specific signal registers and stack bsd-user/arm/target_arch_signal.h: arm machine context for signals bsd-user/arm/target_arch_signal.h: arm user context and trapframe for signals bsd-user/arm/target_arch_signal.h: arm set_sigtramp_args bsd-user/arm/target_arch_signal.h: arm get_mcontext bsd-user/arm/target_arch_signal.h: arm set_mcontext bsd-user/arm/target_arch_signal.h: arm get_ucontext_sigreturn bsd-user: add arm target build bsd-user/i386/target_arch_signal.h: Remove target_sigcontext bsd-user/x86_64/target_arch_signal.h: Remove target_sigcontext bsd-user/i386/target_arch_signal.h: use new target_os_ucontext.h bsd-user/x86_64/target_arch_signal.h: use new target_os_ucontext.h bsd-user/arm/target_arch.h | 28 +++ bsd-user/arm/target_arch_cpu.c | 39 ++++ bsd-user/arm/target_arch_cpu.h | 236 +++++++++++++++++++++++ bsd-user/arm/target_arch_elf.h | 128 +++++++++++++ bsd-user/arm/target_arch_reg.h | 60 ++++++ bsd-user/arm/target_arch_signal.h | 266 ++++++++++++++++++++++++++ bsd-user/arm/target_arch_sigtramp.h | 49 +++++ bsd-user/arm/target_arch_sysarch.h | 6 +- bsd-user/arm/target_arch_thread.h | 80 ++++++++ bsd-user/arm/target_arch_vmparam.h | 48 +++++ bsd-user/arm/target_syscall.h | 27 ++- bsd-user/freebsd/target_os_signal.h | 3 - bsd-user/freebsd/target_os_ucontext.h | 26 +++ bsd-user/i386/target_arch_signal.h | 13 +- bsd-user/signal.c | 21 ++ bsd-user/x86_64/target_arch_signal.h | 13 +- configs/targets/arm-bsd-user.mak | 2 + 17 files changed, 1011 insertions(+), 34 deletions(-) create mode 100644 bsd-user/arm/target_arch.h create mode 100644 bsd-user/arm/target_arch_cpu.c create mode 100644 bsd-user/arm/target_arch_cpu.h create mode 100644 bsd-user/arm/target_arch_elf.h create mode 100644 bsd-user/arm/target_arch_reg.h create mode 100644 bsd-user/arm/target_arch_signal.h create mode 100644 bsd-user/arm/target_arch_sigtramp.h create mode 100644 bsd-user/arm/target_arch_thread.h create mode 100644 bsd-user/arm/target_arch_vmparam.h create mode 100644 bsd-user/freebsd/target_os_ucontext.h create mode 100644 configs/targets/arm-bsd-user.mak -- 2.33.0