Merge tag 'bsd-user-arm-pull-request' of gitlab.com:bsdimp/qemu into staging

bsd-user: arm (32-bit) support

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. The arm and x86
code are now the same as in the bsd-user fork. For full context, the fork is at
https://github.com/qemu-bsd-user/qemu-bsd-user/tree/blitz (though the the recent
sig{bus,segv} needed updates are incomplete).

v5 changes:
   o Moved to using the CPUArchState typedef and move
     set_sigtramp_args, get_mcontext, set_mcontext, and
     get_ucontext_sigreturn prototypes to
     bsd-user/freebsd/target_os_ucontext.h
   o Fix issues with arm's set_mcontext related to masking
     and remove an unnecessary check.

We're down to only one hunk needing review:
    bsd-user/arm/target_arch_signal.c: arm set_mcontext

Warnings that should be ignored:
   o make checkpatch has a couple of complaints about the comments for the
     signal trampoline, since it's a false positive IMHO.
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

# gpg: Signature made Fri 07 Jan 2022 11:36:37 PM PST
# gpg:                using RSA key 2035F894B00AA3CF7CCDE1B76C1CD1287DB01100
# gpg: Good signature from "Warner Losh <wlosh@netflix.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@bsdimp.com>" [unknown]
# gpg:                 aka "Warner Losh <imp@freebsd.org>" [unknown]
# gpg:                 aka "Warner Losh <imp@village.org>" [unknown]
# gpg:                 aka "Warner Losh <wlosh@bsdimp.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 2035 F894 B00A A3CF 7CCD  E1B7 6C1C D128 7DB0 1100

* tag 'bsd-user-arm-pull-request' of gitlab.com:bsdimp/qemu: (37 commits)
  bsd-user: add arm target build
  bsd-user/freebsd/target_os_ucontext.h: Require TARGET_*CONTEXT_SIZE
  bsd-user/arm/signal.c: arm get_ucontext_sigreturn
  bsd-user/arm/signal.c: arm set_mcontext
  bsd-user/arm/signal.c: arm get_mcontext
  bsd-user/arm/signal.c: arm set_sigtramp_args
  bsd-user/arm/target_arch_signal.h: Define size of *context_t
  bsd-user/arm/target_arch_signal.h: arm machine context and trapframe for signals
  bsd-user/arm/target_arch_signal.h: arm specific signal registers and stack
  bsd-user/arm/target_arch_elf.h: arm get_hwcap2 impl
  bsd-user/arm/target_arch_elf.h: arm get hwcap
  bsd-user/arm/target_arch_elf.h: arm defines for ELF
  bsd-user/arm/target_arch_thread.h: Routines to create and switch to a thread
  bsd-user/arm/target_arch_sigtramp.h: Signal Trampoline for arm
  bsd-user/arm/target_arch_vmparam.h: Parameters for arm address space
  bsd-user/arm/target_arch_reg.h: Implement core dump register copying
  bsd-user/arm/target_arch_cpu.h: Implement system call dispatch
  bsd-user/arm/target_arch_cpu.h: Implement data abort exceptions
  bsd-user/arm/target_arch_cpu.h: Implement trivial EXCP exceptions
  bsd-user/arm/target_arch_cpu.h: Dummy target_cpu_loop implementation
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 47 insertions, 48 deletions

diff --git a/bsd-user/i386/target_arch_signal.h b/bsd-user/i386/target_arch_signal.h
index a90750d602..279dadc22c 100644
--- a/bsd-user/i386/target_arch_signal.h
+++ b/bsd-user/i386/target_arch_signal.h
@@ -27,21 +27,56 @@
 #define TARGET_MINSIGSTKSZ  (512 * 4)               /* min sig stack size */
 #define TARGET_SIGSTKSZ     (MINSIGSTKSZ + 32768)   /* recommended size */
 
-struct target_sigcontext {
-    /* to be added */
-};
-
 typedef struct target_mcontext {
+    abi_ulong   mc_onstack;     /* XXX - sigcontext compat. */
+    abi_ulong   mc_gs;          /* machine state (struct trapframe) */
+    abi_ulong   mc_fs;
+    abi_ulong   mc_es;
+    abi_ulong   mc_ds;
+    abi_ulong   mc_edi;
+    abi_ulong   mc_esi;
+    abi_ulong   mc_ebp;
+    abi_ulong   mc_isp;
+    abi_ulong   mc_ebx;
+    abi_ulong   mc_edx;
+    abi_ulong   mc_ecx;
+    abi_ulong   mc_eax;
+    abi_ulong   mc_trapno;
+    abi_ulong   mc_err;
+    abi_ulong   mc_eip;
+    abi_ulong   mc_cs;
+    abi_ulong   mc_eflags;
+    abi_ulong   mc_esp;
+    abi_ulong   mc_ss;
+
+    int32_t     mc_len;                 /* sizeof(mcontext_t) */
+#define _MC_FPFMT_NODEV         0x10000 /* device not present or configured */
+#define _MC_FPFMT_387           0x10001
+#define _MC_FPFMT_XMM           0x10002
+    int32_t     mc_fpformat;
+#define _MC_FPOWNED_NONE        0x20000 /* FP state not used */
+#define _MC_FPOWNED_FPU         0x20001 /* FP state came from FPU */
+#define _MC_FPOWNED_PCB         0x20002 /* FP state came from PCB */
+    int32_t     mc_ownedfp;
+    abi_ulong mc_flags;
+        /*
+         * See <machine/npx.h> for the internals of mc_fpstate[].
+         */
+    int32_t     mc_fpstate[128] __aligned(16);
+
+    abi_ulong mc_fsbase;
+    abi_ulong mc_gsbase;
+
+    abi_ulong mc_xfpustate;
+    abi_ulong mc_xfpustate_len;
+
+    int32_t     mc_spare2[4];
 } target_mcontext_t;
 
-typedef struct target_ucontext {
-    target_sigset_t   uc_sigmask;
-    target_mcontext_t uc_mcontext;
-    abi_ulong         uc_link;
-    target_stack_t    uc_stack;
-    int32_t           uc_flags;
-    int32_t         __spare__[4];
-} target_ucontext_t;
+#define TARGET_MCONTEXT_SIZE 640
+#define TARGET_UCONTEXT_SIZE 704
+
+#include "target_os_ucontext.h"
 
 struct target_sigframe {
     abi_ulong   sf_signum;
@@ -53,40 +88,4 @@ struct target_sigframe {
     uint32_t    __spare__[2];
 };
 
-/*
- * Compare to i386/i386/machdep.c sendsig()
- * Assumes that target stack frame memory is locked.
- */
-static inline abi_long set_sigtramp_args(CPUX86State *regs,
-        int sig, struct target_sigframe *frame, abi_ulong frame_addr,
-        struct target_sigaction *ka)
-{
-    /* XXX return -TARGET_EOPNOTSUPP; */
-    return 0;
-}
-
-/* Compare to i386/i386/machdep.c get_mcontext() */
-static inline abi_long get_mcontext(CPUX86State *regs,
-        target_mcontext_t *mcp, int flags)
-{
-    /* XXX */
-    return -TARGET_EOPNOTSUPP;
-}
-
-/* Compare to i386/i386/machdep.c set_mcontext() */
-static inline abi_long set_mcontext(CPUX86State *regs,
-        target_mcontext_t *mcp, int srflag)
-{
-    /* XXX */
-    return -TARGET_EOPNOTSUPP;
-}
-
-static inline abi_long get_ucontext_sigreturn(CPUX86State *regs,
-                        abi_ulong target_sf, abi_ulong *target_uc)
-{
-    /* XXX */
-    *target_uc = 0;
-    return -TARGET_EOPNOTSUPP;
-}
-
 #endif /* TARGET_ARCH_SIGNAL_H */