diff mbox series

[PULL,24/30] semihosting: Change internal common-semi interfaces to use CPUState *

Message ID 20210115130828.23968-25-alex.bennee@linaro.org (mailing list archive)
State New, archived
Headers show
Series [PULL,01/30] tests/docker: Remove Debian 9 remnant lines | expand

Commit Message

Alex Bennée Jan. 15, 2021, 1:08 p.m. UTC
From: Keith Packard <keithp@keithp.com>

This makes all of the internal interfaces architecture-independent and
renames the internal functions to use the 'common_semi' prefix instead
of 'arm' or 'arm_semi'.

To do this, some new architecture-specific internal helper functions
were created:

    static inline target_ulong
    common_semi_arg(CPUState *cs, int argno)

	Returns the argno'th semihosting argument, where argno can be
	either 0 or 1.

    static inline void
    common_semi_set_ret(CPUState *cs, target_ulong ret)

	Sets the semihosting return value.

    static inline bool
    common_semi_sys_exit_extended(CPUState *cs, int nr)

	This detects whether the specified semihosting call, which
	is either TARGET_SYS_EXIT or TARGET_SYS_EXIT_EXTENDED should
	be executed using the TARGET_SYS_EXIT_EXTENDED semantics.

    static inline target_ulong
    common_semi_rambase(CPUState *cs)

	Returns the base of RAM region used for heap and stack. This
	is used to construct plausible values for the SYS_HEAPINFO
	call.

In addition, several existing functions have been changed to flag
areas of code which are architecture specific:

    static target_ulong
    common_semi_flen_buf(CPUState *cs)

	Returns the current stack pointer minus 64, which is
	where a stat structure will be placed on the stack

    #define GET_ARG(n)

	This fetches arguments from the semihosting command's argument
	block. The address of this is available implicitly through the
	local 'args' variable. This is *mostly* architecture
	independent, but does depend on the current ABI's notion of
	the size of a 'long' parameter, which may need run-time checks
	(as it does on AARCH64)

    #define SET_ARG(n, val)

	This mirrors GET_ARG and stores data back into the argument
	block.

Signed-off-by: Keith Packard <keithp@keithp.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-Id: <20210107170717.2098982-4-keithp@keithp.com>
Message-Id: <20210108224256.2321-15-alex.bennee@linaro.org>

Comments

Peter Maydell Feb. 17, 2021, 3:02 p.m. UTC | #1
On Fri, 15 Jan 2021 at 13:33, Alex Bennée <alex.bennee@linaro.org> wrote:
>
> From: Keith Packard <keithp@keithp.com>
>
> This makes all of the internal interfaces architecture-independent and
> renames the internal functions to use the 'common_semi' prefix instead
> of 'arm' or 'arm_semi'.

Hi; it looks like this commit broke the implementation of
the SYS_HEAPINFO call (see https://bugs.launchpad.net/qemu/+bug/1915925).

Specifically:

> @@ -1064,23 +1089,19 @@ target_ulong do_common_semihosting(CPUState *cs)
>              for (i = 0; i < ARRAY_SIZE(retvals); i++) {
>                  bool fail;
>
> -                if (is_a64(env)) {
> -                    fail = put_user_u64(retvals[i], arg0 + i * 8);
> -                } else {
> -                    fail = put_user_u32(retvals[i], arg0 + i * 4);
> -                }
> +                fail = SET_ARG(i, retvals[i]);

this code which is writing the heap info into guest memory
should not be using SET_ARG(). The SYS_HEAPINFO API says:
# On entry, the PARAMETER REGISTER contains the address of a pointer
# to a four-field data block.

which is to say that the parameter register points to a 1-word
argument block, whose single constituent is a value giving the
address of the (heapbase, heaplimit, stackbase, stacklimit)
structure we need to fill in.

The change here to use SET_ARG() is making us write the
retvals to the argument block, when we should be writing them
to the memory pointed to by arg0. (This is why the original
code wasn't using SET_ARG...)

Could you look at a fix for this, please?

I think you probably need to abstract out "figure out the
size of a 'field' for this target", which for Arm is "is_a64() ? 8 : 4",
and for riscv seems to be "sizeof(target_ulong)" [*]. That
then as a followup would let you have a common code implementation
of GET_ARG() and SET_ARG().

[*] side note -- shouldn't this be checking riscv_cpu_is_32bit() now ?

thanks
-- PMM
diff mbox series

Patch

diff --git a/hw/semihosting/arm-compat-semi.c b/hw/semihosting/arm-compat-semi.c
index 2e959aba08..ac1271545e 100644
--- a/hw/semihosting/arm-compat-semi.c
+++ b/hw/semihosting/arm-compat-semi.c
@@ -32,15 +32,18 @@ 
 #include "cpu.h"
 #include "hw/semihosting/semihost.h"
 #include "hw/semihosting/console.h"
+#include "hw/semihosting/common-semi.h"
 #include "qemu/log.h"
 #ifdef CONFIG_USER_ONLY
 #include "qemu.h"
 
-#define ARM_ANGEL_HEAP_SIZE (128 * 1024 * 1024)
+#define COMMON_SEMI_HEAP_SIZE (128 * 1024 * 1024)
 #else
 #include "exec/gdbstub.h"
 #include "qemu/cutils.h"
+#ifdef TARGET_ARM
 #include "hw/arm/boot.h"
+#endif
 #include "hw/boards.h"
 #endif
 
@@ -134,6 +137,50 @@  typedef struct GuestFD {
 
 static GArray *guestfd_array;
 
+#ifdef TARGET_ARM
+static inline target_ulong
+common_semi_arg(CPUState *cs, int argno)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+    if (is_a64(env)) {
+        return env->xregs[argno];
+    } else {
+        return env->regs[argno];
+    }
+}
+
+static inline void
+common_semi_set_ret(CPUState *cs, target_ulong ret)
+{
+    ARMCPU *cpu = ARM_CPU(cs);
+    CPUARMState *env = &cpu->env;
+    if (is_a64(env)) {
+        env->xregs[0] = ret;
+    } else {
+        env->regs[0] = ret;
+    }
+}
+
+static inline bool
+common_semi_sys_exit_extended(CPUState *cs, int nr)
+{
+    return (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(cs->env_ptr));
+}
+
+#ifndef CONFIG_USER_ONLY
+#include "hw/arm/boot.h"
+static inline target_ulong
+common_semi_rambase(CPUState *cs)
+{
+    CPUArchState *env = cs->env_ptr;
+    const struct arm_boot_info *info = env->boot_info;
+    return info->loader_start;
+}
+#endif
+
+#endif /* TARGET_ARM */
+
 /*
  * Allocate a new guest file descriptor and return it; if we
  * couldn't allocate a new fd then return -1.
@@ -239,11 +286,10 @@  static target_ulong syscall_err;
 #include "exec/softmmu-semi.h"
 #endif
 
-static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
+static inline uint32_t set_swi_errno(CPUState *cs, uint32_t code)
 {
     if (code == (uint32_t)-1) {
 #ifdef CONFIG_USER_ONLY
-        CPUState *cs = env_cpu(env);
         TaskState *ts = cs->opaque;
 
         ts->swi_errno = errno;
@@ -254,10 +300,9 @@  static inline uint32_t set_swi_errno(CPUARMState *env, uint32_t code)
     return code;
 }
 
-static inline uint32_t get_swi_errno(CPUARMState *env)
+static inline uint32_t get_swi_errno(CPUState *cs)
 {
 #ifdef CONFIG_USER_ONLY
-    CPUState *cs = env_cpu(env);
     TaskState *ts = cs->opaque;
 
     return ts->swi_errno;
@@ -266,24 +311,22 @@  static inline uint32_t get_swi_errno(CPUARMState *env)
 #endif
 }
 
-static target_ulong arm_semi_syscall_len;
+static target_ulong common_semi_syscall_len;
 
-static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void common_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
 {
-    ARMCPU *cpu = ARM_CPU(cs);
-    CPUARMState *env = &cpu->env;
-    target_ulong reg0 = is_a64(env) ? env->xregs[0] : env->regs[0];
+    target_ulong reg0 = common_semi_arg(cs, 0);
 
     if (ret == (target_ulong)-1) {
         errno = err;
-        set_swi_errno(env, -1);
+        set_swi_errno(cs, -1);
         reg0 = ret;
     } else {
         /* Fixup syscalls that use nonstardard return conventions.  */
         switch (reg0) {
         case TARGET_SYS_WRITE:
         case TARGET_SYS_READ:
-            reg0 = arm_semi_syscall_len - ret;
+            reg0 = common_semi_syscall_len - ret;
             break;
         case TARGET_SYS_SEEK:
             reg0 = 0;
@@ -293,77 +336,66 @@  static void arm_semi_cb(CPUState *cs, target_ulong ret, target_ulong err)
             break;
         }
     }
-    if (is_a64(env)) {
-        env->xregs[0] = reg0;
-    } else {
-        env->regs[0] = reg0;
-    }
+    common_semi_set_ret(cs, reg0);
 }
 
-static target_ulong arm_flen_buf(ARMCPU *cpu)
+static target_ulong common_semi_flen_buf(CPUState *cs)
 {
+    target_ulong sp;
+#ifdef TARGET_ARM
     /* Return an address in target memory of 64 bytes where the remote
      * gdb should write its stat struct. (The format of this structure
      * is defined by GDB's remote protocol and is not target-specific.)
      * We put this on the guest's stack just below SP.
      */
+    ARMCPU *cpu = ARM_CPU(cs);
     CPUARMState *env = &cpu->env;
-    target_ulong sp;
 
     if (is_a64(env)) {
         sp = env->xregs[31];
     } else {
         sp = env->regs[13];
     }
+#endif
 
     return sp - 64;
 }
 
-static void arm_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_flen_cb(CPUState *cs, target_ulong ret, target_ulong err)
 {
-    ARMCPU *cpu = ARM_CPU(cs);
-    CPUARMState *env = &cpu->env;
     /* The size is always stored in big-endian order, extract
        the value. We assume the size always fit in 32 bits.  */
     uint32_t size;
-    cpu_memory_rw_debug(cs, arm_flen_buf(cpu) + 32, (uint8_t *)&size, 4, 0);
+    cpu_memory_rw_debug(cs, common_semi_flen_buf(cs) + 32,
+                        (uint8_t *)&size, 4, 0);
     size = be32_to_cpu(size);
-    if (is_a64(env)) {
-        env->xregs[0] = size;
-    } else {
-        env->regs[0] = size;
-    }
+    common_semi_set_ret(cs, size);
     errno = err;
-    set_swi_errno(env, -1);
+    set_swi_errno(cs, -1);
 }
 
-static int arm_semi_open_guestfd;
+static int common_semi_open_guestfd;
 
-static void arm_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
+static void
+common_semi_open_cb(CPUState *cs, target_ulong ret, target_ulong err)
 {
-    ARMCPU *cpu = ARM_CPU(cs);
-    CPUARMState *env = &cpu->env;
     if (ret == (target_ulong)-1) {
         errno = err;
-        set_swi_errno(env, -1);
-        dealloc_guestfd(arm_semi_open_guestfd);
+        set_swi_errno(cs, -1);
+        dealloc_guestfd(common_semi_open_guestfd);
     } else {
-        associate_guestfd(arm_semi_open_guestfd, ret);
-        ret = arm_semi_open_guestfd;
-    }
-
-    if (is_a64(env)) {
-        env->xregs[0] = ret;
-    } else {
-        env->regs[0] = ret;
+        associate_guestfd(common_semi_open_guestfd, ret);
+        ret = common_semi_open_guestfd;
     }
+    common_semi_set_ret(cs, ret);
 }
 
-static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
-                                    const char *fmt, ...)
+static target_ulong
+common_semi_gdb_syscall(CPUState *cs, gdb_syscall_complete_cb cb,
+                        const char *fmt, ...)
 {
     va_list va;
-    CPUARMState *env = &cpu->env;
 
     va_start(va, fmt);
     gdb_do_syscallv(cb, fmt, va);
@@ -386,7 +418,7 @@  static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
      * doing something with the return value is not possible to make.
      */
 
-    return is_a64(env) ? env->xregs[0] : env->regs[0];
+    return common_semi_arg(cs, 0);
 }
 
 /*
@@ -395,20 +427,18 @@  static target_ulong arm_gdb_syscall(ARMCPU *cpu, gdb_syscall_complete_cb cb,
  * do the work and return the required return value for the guest,
  * setting the guest errno if appropriate.
  */
-typedef uint32_t sys_closefn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_writefn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_closefn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_writefn(CPUState *cs, GuestFD *gf,
                              target_ulong buf, uint32_t len);
-typedef uint32_t sys_readfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_readfn(CPUState *cs, GuestFD *gf,
                             target_ulong buf, uint32_t len);
-typedef uint32_t sys_isattyfn(ARMCPU *cpu, GuestFD *gf);
-typedef uint32_t sys_seekfn(ARMCPU *cpu, GuestFD *gf,
+typedef uint32_t sys_isattyfn(CPUState *cs, GuestFD *gf);
+typedef uint32_t sys_seekfn(CPUState *cs, GuestFD *gf,
                             target_ulong offset);
-typedef uint32_t sys_flenfn(ARMCPU *cpu, GuestFD *gf);
+typedef uint32_t sys_flenfn(CPUState *cs, GuestFD *gf);
 
-static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_closefn(CPUState *cs, GuestFD *gf)
 {
-    CPUARMState *env = &cpu->env;
-
     /*
      * Only close the underlying host fd if it's one we opened on behalf
      * of the guest in SYS_OPEN.
@@ -418,20 +448,21 @@  static uint32_t host_closefn(ARMCPU *cpu, GuestFD *gf)
         gf->hostfd == STDERR_FILENO) {
         return 0;
     }
-    return set_swi_errno(env, close(gf->hostfd));
+    return set_swi_errno(cs, close(gf->hostfd));
 }
 
-static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_writefn(CPUState *cs, GuestFD *gf,
                              target_ulong buf, uint32_t len)
 {
+    CPUArchState *env = cs->env_ptr;
     uint32_t ret;
-    CPUARMState *env = &cpu->env;
     char *s = lock_user(VERIFY_READ, buf, len, 1);
+    (void) env; /* Used in arm softmmu lock_user implicitly */
     if (!s) {
         /* Return bytes not written on error */
         return len;
     }
-    ret = set_swi_errno(env, write(gf->hostfd, s, len));
+    ret = set_swi_errno(cs, write(gf->hostfd, s, len));
     unlock_user(s, buf, 0);
     if (ret == (uint32_t)-1) {
         ret = 0;
@@ -440,18 +471,19 @@  static uint32_t host_writefn(ARMCPU *cpu, GuestFD *gf,
     return len - ret;
 }
 
-static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t host_readfn(CPUState *cs, GuestFD *gf,
                             target_ulong buf, uint32_t len)
 {
+    CPUArchState *env = cs->env_ptr;
     uint32_t ret;
-    CPUARMState *env = &cpu->env;
     char *s = lock_user(VERIFY_WRITE, buf, len, 0);
+    (void) env; /* Used in arm softmmu lock_user implicitly */
     if (!s) {
         /* return bytes not read */
         return len;
     }
     do {
-        ret = set_swi_errno(env, read(gf->hostfd, s, len));
+        ret = set_swi_errno(cs, read(gf->hostfd, s, len));
     } while (ret == -1 && errno == EINTR);
     unlock_user(s, buf, len);
     if (ret == (uint32_t)-1) {
@@ -461,68 +493,66 @@  static uint32_t host_readfn(ARMCPU *cpu, GuestFD *gf,
     return len - ret;
 }
 
-static uint32_t host_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_isattyfn(CPUState *cs, GuestFD *gf)
 {
     return isatty(gf->hostfd);
 }
 
-static uint32_t host_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t host_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
 {
-    CPUARMState *env = &cpu->env;
-    uint32_t ret = set_swi_errno(env, lseek(gf->hostfd, offset, SEEK_SET));
+    uint32_t ret = set_swi_errno(cs, lseek(gf->hostfd, offset, SEEK_SET));
     if (ret == (uint32_t)-1) {
         return -1;
     }
     return 0;
 }
 
-static uint32_t host_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t host_flenfn(CPUState *cs, GuestFD *gf)
 {
-    CPUARMState *env = &cpu->env;
     struct stat buf;
-    uint32_t ret = set_swi_errno(env, fstat(gf->hostfd, &buf));
+    uint32_t ret = set_swi_errno(cs, fstat(gf->hostfd, &buf));
     if (ret == (uint32_t)-1) {
         return -1;
     }
     return buf.st_size;
 }
 
-static uint32_t gdb_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_closefn(CPUState *cs, GuestFD *gf)
 {
-    return arm_gdb_syscall(cpu, arm_semi_cb, "close,%x", gf->hostfd);
+    return common_semi_gdb_syscall(cs, common_semi_cb, "close,%x", gf->hostfd);
 }
 
-static uint32_t gdb_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_writefn(CPUState *cs, GuestFD *gf,
                             target_ulong buf, uint32_t len)
 {
-    arm_semi_syscall_len = len;
-    return arm_gdb_syscall(cpu, arm_semi_cb, "write,%x,%x,%x",
-                           gf->hostfd, buf, len);
+    common_semi_syscall_len = len;
+    return common_semi_gdb_syscall(cs, common_semi_cb, "write,%x,%x,%x",
+                                   gf->hostfd, buf, len);
 }
 
-static uint32_t gdb_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t gdb_readfn(CPUState *cs, GuestFD *gf,
                            target_ulong buf, uint32_t len)
 {
-    arm_semi_syscall_len = len;
-    return arm_gdb_syscall(cpu, arm_semi_cb, "read,%x,%x,%x",
-                           gf->hostfd, buf, len);
+    common_semi_syscall_len = len;
+    return common_semi_gdb_syscall(cs, common_semi_cb, "read,%x,%x,%x",
+                                   gf->hostfd, buf, len);
 }
 
-static uint32_t gdb_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_isattyfn(CPUState *cs, GuestFD *gf)
 {
-    return arm_gdb_syscall(cpu, arm_semi_cb, "isatty,%x", gf->hostfd);
+    return common_semi_gdb_syscall(cs, common_semi_cb, "isatty,%x", gf->hostfd);
 }
 
-static uint32_t gdb_seekfn(ARMCPU *cpu, GuestFD *gf, target_ulong offset)
+static uint32_t gdb_seekfn(CPUState *cs, GuestFD *gf, target_ulong offset)
 {
-    return arm_gdb_syscall(cpu, arm_semi_cb, "lseek,%x,%x,0",
-                           gf->hostfd, offset);
+    return common_semi_gdb_syscall(cs, common_semi_cb, "lseek,%x,%x,0",
+                                   gf->hostfd, offset);
 }
 
-static uint32_t gdb_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t gdb_flenfn(CPUState *cs, GuestFD *gf)
 {
-    return arm_gdb_syscall(cpu, arm_semi_flen_cb, "fstat,%x,%x",
-                           gf->hostfd, arm_flen_buf(cpu));
+    return common_semi_gdb_syscall(cs, common_semi_flen_cb, "fstat,%x,%x",
+                                   gf->hostfd, common_semi_flen_buf(cs));
 }
 
 #define SHFB_MAGIC_0 0x53
@@ -551,31 +581,29 @@  static void init_featurefile_guestfd(int guestfd)
     gf->featurefile_offset = 0;
 }
 
-static uint32_t featurefile_closefn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_closefn(CPUState *cs, GuestFD *gf)
 {
     /* Nothing to do */
     return 0;
 }
 
-static uint32_t featurefile_writefn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_writefn(CPUState *cs, GuestFD *gf,
                                     target_ulong buf, uint32_t len)
 {
     /* This fd can never be open for writing */
-    CPUARMState *env = &cpu->env;
 
     errno = EBADF;
-    return set_swi_errno(env, -1);
+    return set_swi_errno(cs, -1);
 }
 
-static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_readfn(CPUState *cs, GuestFD *gf,
                                    target_ulong buf, uint32_t len)
 {
+    CPUArchState *env = cs->env_ptr;
     uint32_t i;
-#ifndef CONFIG_USER_ONLY
-    CPUARMState *env = &cpu->env;
-#endif
     char *s;
 
+    (void) env; /* Used in arm softmmu lock_user implicitly */
     s = lock_user(VERIFY_WRITE, buf, len, 0);
     if (!s) {
         return len;
@@ -595,19 +623,19 @@  static uint32_t featurefile_readfn(ARMCPU *cpu, GuestFD *gf,
     return len - i;
 }
 
-static uint32_t featurefile_isattyfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_isattyfn(CPUState *cs, GuestFD *gf)
 {
     return 0;
 }
 
-static uint32_t featurefile_seekfn(ARMCPU *cpu, GuestFD *gf,
+static uint32_t featurefile_seekfn(CPUState *cs, GuestFD *gf,
                                    target_ulong offset)
 {
     gf->featurefile_offset = offset;
     return 0;
 }
 
-static uint32_t featurefile_flenfn(ARMCPU *cpu, GuestFD *gf)
+static uint32_t featurefile_flenfn(CPUState *cs, GuestFD *gf)
 {
     return sizeof(featurefile_data);
 }
@@ -651,16 +679,17 @@  static const GuestFDFunctions guestfd_fns[] = {
 /* Read the input value from the argument block; fail the semihosting
  * call if the memory read fails.
  */
+#ifdef TARGET_ARM
 #define GET_ARG(n) do {                                 \
     if (is_a64(env)) {                                  \
         if (get_user_u64(arg ## n, args + (n) * 8)) {   \
             errno = EFAULT;                             \
-            return set_swi_errno(env, -1);              \
+            return set_swi_errno(cs, -1);              \
         }                                               \
     } else {                                            \
         if (get_user_u32(arg ## n, args + (n) * 4)) {   \
             errno = EFAULT;                             \
-            return set_swi_errno(env, -1);              \
+            return set_swi_errno(cs, -1);              \
         }                                               \
     }                                                   \
 } while (0)
@@ -669,6 +698,7 @@  static const GuestFDFunctions guestfd_fns[] = {
     (is_a64(env) ?                                      \
      put_user_u64(val, args + (n) * 8) :                \
      put_user_u32(val, args + (n) * 4))
+#endif
 
 /*
  * Do a semihosting call.
@@ -681,8 +711,7 @@  static const GuestFDFunctions guestfd_fns[] = {
  */
 target_ulong do_common_semihosting(CPUState *cs)
 {
-    ARMCPU *cpu = ARM_CPU(cs);
-    CPUARMState *env = &cpu->env;
+    CPUArchState *env = cs->env_ptr;
     target_ulong args;
     target_ulong arg0, arg1, arg2, arg3;
     char * s;
@@ -691,14 +720,9 @@  target_ulong do_common_semihosting(CPUState *cs)
     uint32_t len;
     GuestFD *gf;
 
-    if (is_a64(env)) {
-        /* Note that the syscall number is in W0, not X0 */
-        nr = env->xregs[0] & 0xffffffffU;
-        args = env->xregs[1];
-    } else {
-        nr = env->regs[0];
-        args = env->regs[1];
-    }
+    (void) env; /* Used implicitly by arm lock_user macro */
+    nr = common_semi_arg(cs, 0) & 0xffffffffU;
+    args = common_semi_arg(cs, 1);
 
     switch (nr) {
     case TARGET_SYS_OPEN:
@@ -711,19 +735,19 @@  target_ulong do_common_semihosting(CPUState *cs)
         s = lock_user_string(arg0);
         if (!s) {
             errno = EFAULT;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
         if (arg1 >= 12) {
             unlock_user(s, arg0, 0);
             errno = EINVAL;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
         guestfd = alloc_guestfd();
         if (guestfd < 0) {
             unlock_user(s, arg0, 0);
             errno = EMFILE;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
         if (strcmp(s, ":tt") == 0) {
@@ -752,18 +776,19 @@  target_ulong do_common_semihosting(CPUState *cs)
             if (arg1 != 0 && arg1 != 1) {
                 dealloc_guestfd(guestfd);
                 errno = EACCES;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
             init_featurefile_guestfd(guestfd);
             return guestfd;
         }
 
         if (use_gdb_syscalls()) {
-            arm_semi_open_guestfd = guestfd;
-            ret = arm_gdb_syscall(cpu, arm_semi_open_cb, "open,%s,%x,1a4", arg0,
-                                  (int)arg2 + 1, gdb_open_modeflags[arg1]);
+            common_semi_open_guestfd = guestfd;
+            ret = common_semi_gdb_syscall(cs, common_semi_open_cb,
+                                          "open,%s,%x,1a4", arg0, (int)arg2 + 1,
+                                          gdb_open_modeflags[arg1]);
         } else {
-            ret = set_swi_errno(env, open(s, open_modeflags[arg1], 0644));
+            ret = set_swi_errno(cs, open(s, open_modeflags[arg1], 0644));
             if (ret == (uint32_t)-1) {
                 dealloc_guestfd(guestfd);
             } else {
@@ -780,17 +805,17 @@  target_ulong do_common_semihosting(CPUState *cs)
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        ret = guestfd_fns[gf->type].closefn(cpu, gf);
+        ret = guestfd_fns[gf->type].closefn(cs, gf);
         dealloc_guestfd(arg0);
         return ret;
     case TARGET_SYS_WRITEC:
-        qemu_semihosting_console_outc(env, args);
+        qemu_semihosting_console_outc(cs->env_ptr, args);
         return 0xdeadbeef;
     case TARGET_SYS_WRITE0:
-        return qemu_semihosting_console_outs(env, args);
+        return qemu_semihosting_console_outs(cs->env_ptr, args);
     case TARGET_SYS_WRITE:
         GET_ARG(0);
         GET_ARG(1);
@@ -800,10 +825,10 @@  target_ulong do_common_semihosting(CPUState *cs)
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        return guestfd_fns[gf->type].writefn(cpu, gf, arg1, len);
+        return guestfd_fns[gf->type].writefn(cs, gf, arg1, len);
     case TARGET_SYS_READ:
         GET_ARG(0);
         GET_ARG(1);
@@ -813,22 +838,22 @@  target_ulong do_common_semihosting(CPUState *cs)
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        return guestfd_fns[gf->type].readfn(cpu, gf, arg1, len);
+        return guestfd_fns[gf->type].readfn(cs, gf, arg1, len);
     case TARGET_SYS_READC:
-        return qemu_semihosting_console_inc(env);
+        return qemu_semihosting_console_inc(cs->env_ptr);
     case TARGET_SYS_ISTTY:
         GET_ARG(0);
 
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        return guestfd_fns[gf->type].isattyfn(cpu, gf);
+        return guestfd_fns[gf->type].isattyfn(cs, gf);
     case TARGET_SYS_SEEK:
         GET_ARG(0);
         GET_ARG(1);
@@ -836,20 +861,20 @@  target_ulong do_common_semihosting(CPUState *cs)
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        return guestfd_fns[gf->type].seekfn(cpu, gf, arg1);
+        return guestfd_fns[gf->type].seekfn(cs, gf, arg1);
     case TARGET_SYS_FLEN:
         GET_ARG(0);
 
         gf = get_guestfd(arg0);
         if (!gf) {
             errno = EBADF;
-            return set_swi_errno(env, -1);
+            return set_swi_errno(cs, -1);
         }
 
-        return guestfd_fns[gf->type].flenfn(cpu, gf);
+        return guestfd_fns[gf->type].flenfn(cs, gf);
     case TARGET_SYS_TMPNAM:
         qemu_log_mask(LOG_UNIMP, "%s: SYS_TMPNAM not implemented", __func__);
         return -1;
@@ -857,15 +882,15 @@  target_ulong do_common_semihosting(CPUState *cs)
         GET_ARG(0);
         GET_ARG(1);
         if (use_gdb_syscalls()) {
-            ret = arm_gdb_syscall(cpu, arm_semi_cb, "unlink,%s",
-                                  arg0, (int)arg1 + 1);
+            ret = common_semi_gdb_syscall(cs, common_semi_cb, "unlink,%s",
+                                          arg0, (int)arg1 + 1);
         } else {
             s = lock_user_string(arg0);
             if (!s) {
                 errno = EFAULT;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
-            ret =  set_swi_errno(env, remove(s));
+            ret =  set_swi_errno(cs, remove(s));
             unlock_user(s, arg0, 0);
         }
         return ret;
@@ -875,17 +900,18 @@  target_ulong do_common_semihosting(CPUState *cs)
         GET_ARG(2);
         GET_ARG(3);
         if (use_gdb_syscalls()) {
-            return arm_gdb_syscall(cpu, arm_semi_cb, "rename,%s,%s",
-                                   arg0, (int)arg1 + 1, arg2, (int)arg3 + 1);
+            return common_semi_gdb_syscall(cs, common_semi_cb, "rename,%s,%s",
+                                           arg0, (int)arg1 + 1, arg2,
+                                           (int)arg3 + 1);
         } else {
             char *s2;
             s = lock_user_string(arg0);
             s2 = lock_user_string(arg2);
             if (!s || !s2) {
                 errno = EFAULT;
-                ret = set_swi_errno(env, -1);
+                ret = set_swi_errno(cs, -1);
             } else {
-                ret = set_swi_errno(env, rename(s, s2));
+                ret = set_swi_errno(cs, rename(s, s2));
             }
             if (s2)
                 unlock_user(s2, arg2, 0);
@@ -896,25 +922,25 @@  target_ulong do_common_semihosting(CPUState *cs)
     case TARGET_SYS_CLOCK:
         return clock() / (CLOCKS_PER_SEC / 100);
     case TARGET_SYS_TIME:
-        return set_swi_errno(env, time(NULL));
+        return set_swi_errno(cs, time(NULL));
     case TARGET_SYS_SYSTEM:
         GET_ARG(0);
         GET_ARG(1);
         if (use_gdb_syscalls()) {
-            return arm_gdb_syscall(cpu, arm_semi_cb, "system,%s",
-                                   arg0, (int)arg1 + 1);
+            return common_semi_gdb_syscall(cs, common_semi_cb, "system,%s",
+                                           arg0, (int)arg1 + 1);
         } else {
             s = lock_user_string(arg0);
             if (!s) {
                 errno = EFAULT;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
-            ret = set_swi_errno(env, system(s));
+            ret = set_swi_errno(cs, system(s));
             unlock_user(s, arg0, 0);
             return ret;
         }
     case TARGET_SYS_ERRNO:
-        return get_swi_errno(env);
+        return get_swi_errno(cs);
     case TARGET_SYS_GET_CMDLINE:
         {
             /* Build a command-line from the original argv.
@@ -966,21 +992,21 @@  target_ulong do_common_semihosting(CPUState *cs)
             if (output_size > input_size) {
                 /* Not enough space to store command-line arguments.  */
                 errno = E2BIG;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
 
             /* Adjust the command-line length.  */
             if (SET_ARG(1, output_size - 1)) {
                 /* Couldn't write back to argument block */
                 errno = EFAULT;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
 
             /* Lock the buffer on the ARM side.  */
             output_buffer = lock_user(VERIFY_WRITE, arg0, output_size, 0);
             if (!output_buffer) {
                 errno = EFAULT;
-                return set_swi_errno(env, -1);
+                return set_swi_errno(cs, -1);
             }
 
             /* Copy the command-line arguments.  */
@@ -996,7 +1022,7 @@  target_ulong do_common_semihosting(CPUState *cs)
             if (copy_from_user(output_buffer, ts->info->arg_start,
                                output_size)) {
                 errno = EFAULT;
-                status = set_swi_errno(env, -1);
+                status = set_swi_errno(cs, -1);
                 goto out;
             }
 
@@ -1021,8 +1047,7 @@  target_ulong do_common_semihosting(CPUState *cs)
 #ifdef CONFIG_USER_ONLY
             TaskState *ts = cs->opaque;
 #else
-            const struct arm_boot_info *info = env->boot_info;
-            target_ulong rambase = info->loader_start;
+            target_ulong rambase = common_semi_rambase(cs);
 #endif
 
             GET_ARG(0);
@@ -1036,7 +1061,7 @@  target_ulong do_common_semihosting(CPUState *cs)
                 abi_ulong ret;
 
                 ts->heap_base = do_brk(0);
-                limit = ts->heap_base + ARM_ANGEL_HEAP_SIZE;
+                limit = ts->heap_base + COMMON_SEMI_HEAP_SIZE;
                 /* Try a big heap, and reduce the size if that fails.  */
                 for (;;) {
                     ret = do_brk(limit);
@@ -1064,23 +1089,19 @@  target_ulong do_common_semihosting(CPUState *cs)
             for (i = 0; i < ARRAY_SIZE(retvals); i++) {
                 bool fail;
 
-                if (is_a64(env)) {
-                    fail = put_user_u64(retvals[i], arg0 + i * 8);
-                } else {
-                    fail = put_user_u32(retvals[i], arg0 + i * 4);
-                }
+                fail = SET_ARG(i, retvals[i]);
 
                 if (fail) {
                     /* Couldn't write back to argument block */
                     errno = EFAULT;
-                    return set_swi_errno(env, -1);
+                    return set_swi_errno(cs, -1);
                 }
             }
             return 0;
         }
     case TARGET_SYS_EXIT:
     case TARGET_SYS_EXIT_EXTENDED:
-        if (nr == TARGET_SYS_EXIT_EXTENDED || is_a64(env)) {
+        if (common_semi_sys_exit_extended(cs, nr)) {
             /*
              * The A64 version of SYS_EXIT takes a parameter block,
              * so the application-exit type can return a subcode which
@@ -1113,9 +1134,11 @@  target_ulong do_common_semihosting(CPUState *cs)
          * virtual address range. This is a nop for us since we don't
          * implement caches. This is only present on A64.
          */
-        if (is_a64(env)) {
+#ifdef TARGET_ARM
+        if (is_a64(cs->env_ptr)) {
             return 0;
         }
+#endif
         /* fall through -- invalid for A32/T32 */
     default:
         fprintf(stderr, "qemu: Unsupported SemiHosting SWI 0x%02x\n", nr);