[v2,26/48] bsd-user: move sparc cpu_loop into target_arch_cpu.h as target_cpu_loop

Commit Message

Warner Losh April 24, 2021, 3:59 p.m. UTC

From: Warner Losh <[e-mail]>

Move the sparc cpu_loop out of main.c and into target_arch_cpu.h and
rename it from cpu_loop to target_cpu_loop. Remove the #ifdef around
the catch-all cpu_loop.

Signed-off-by: Stacey Son <[e-mail]>
Signed-off-by: Warner Losh <[e-mail]>
---
 bsd-user/main.c                  | 270 -------------------------------
 bsd-user/sparc/target_arch_cpu.h | 267 +++++++++++++++++++++++++++++-
 2 files changed, 266 insertions(+), 271 deletions(-)

Comments

Richard Henderson April 24, 2021, 5:45 p.m. UTC | #1

On 4/24/21 8:59 AM, [e-mail] wrote:
> From: Warner Losh<[e-mail]>
> 
> Move the sparc cpu_loop out of main.c and into target_arch_cpu.h and
> rename it from cpu_loop to target_cpu_loop. Remove the #ifdef around
> the catch-all cpu_loop.
> 
> Signed-off-by: Stacey Son<[e-mail]>
> Signed-off-by: Warner Losh<[e-mail]>
> ---
>   bsd-user/main.c                  | 270 -------------------------------
>   bsd-user/sparc/target_arch_cpu.h | 267 +++++++++++++++++++++++++++++-
>   2 files changed, 266 insertions(+), 271 deletions(-)

Reviewed-by: Richard Henderson <[e-mail]>

r~

Patch

diff --git a/bsd-user/main.c b/bsd-user/main.c
index 43c578c760..af4eae2e8b 100644
--- a/bsd-user/main.c
+++ b/bsd-user/main.c
@@ -88,280 +88,10 @@  void fork_end(int child)
     }
 }
 
-#ifdef TARGET_I386 /* stopgap ifdef */
 void cpu_loop(CPUArchState *env)
 {
     target_cpu_loop(env);
 }
-#endif
-
-#ifdef TARGET_SPARC
-#define SPARC64_STACK_BIAS 2047
-
-/* #define DEBUG_WIN */
-/*
- * WARNING: dealing with register windows _is_ complicated. More info
- * can be found at http://www.sics.se/~psm/sparcstack.html
- */
-static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
-{
-    index = (index + cwp * 16) % (16 * env->nwindows);
-    /*
-     * wrap handling : if cwp is on the last window, then we use the
-     * registers 'after' the end
-     */
-    if (index < 8 && env->cwp == env->nwindows - 1) {
-        index += 16 * env->nwindows;
-    }
-    return index;
-}
-
-/* save the register window 'cwp1' */
-static inline void save_window_offset(CPUSPARCState *env, int cwp1)
-{
-    unsigned int i;
-    abi_ulong sp_ptr;
-
-    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
-#ifdef TARGET_SPARC64
-    if (sp_ptr & 3) {
-        sp_ptr += SPARC64_STACK_BIAS;
-    }
-#endif
-#if defined(DEBUG_WIN)
-    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
-           sp_ptr, cwp1);
-#endif
-    for (i = 0; i < 16; i++) {
-        /* FIXME - what to do if put_user() fails? */
-        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
-        sp_ptr += sizeof(abi_ulong);
-    }
-}
-
-static void save_window(CPUSPARCState *env)
-{
-#ifndef TARGET_SPARC64
-    unsigned int new_wim;
-    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
-        ((1LL << env->nwindows) - 1);
-    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
-    env->wim = new_wim;
-#else
-    /*
-     * cansave is zero if the spill trap handler is triggered by `save` and
-     * nonzero if triggered by a `flushw`
-     */
-    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
-    env->cansave++;
-    env->canrestore--;
-#endif
-}
-
-static void restore_window(CPUSPARCState *env)
-{
-#ifndef TARGET_SPARC64
-    unsigned int new_wim;
-#endif
-    unsigned int i, cwp1;
-    abi_ulong sp_ptr;
-
-#ifndef TARGET_SPARC64
-    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
-        ((1LL << env->nwindows) - 1);
-#endif
-
-    /* restore the invalid window */
-    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
-    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
-#ifdef TARGET_SPARC64
-    if (sp_ptr & 3) {
-        sp_ptr += SPARC64_STACK_BIAS;
-    }
-#endif
-#if defined(DEBUG_WIN)
-    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
-           sp_ptr, cwp1);
-#endif
-    for (i = 0; i < 16; i++) {
-        /* FIXME - what to do if get_user() fails? */
-        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
-        sp_ptr += sizeof(abi_ulong);
-    }
-#ifdef TARGET_SPARC64
-    env->canrestore++;
-    if (env->cleanwin < env->nwindows - 1) {
-        env->cleanwin++;
-    }
-    env->cansave--;
-#else
-    env->wim = new_wim;
-#endif
-}
-
-static void flush_windows(CPUSPARCState *env)
-{
-    int offset, cwp1;
-
-    offset = 1;
-    for (;;) {
-        /* if restore would invoke restore_window(), then we can stop */
-        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
-#ifndef TARGET_SPARC64
-        if (env->wim & (1 << cwp1)) {
-            break;
-        }
-#else
-        if (env->canrestore == 0) {
-            break;
-        }
-        env->cansave++;
-        env->canrestore--;
-#endif
-        save_window_offset(env, cwp1);
-        offset++;
-    }
-    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
-#ifndef TARGET_SPARC64
-    /* set wim so that restore will reload the registers */
-    env->wim = 1 << cwp1;
-#endif
-#if defined(DEBUG_WIN)
-    printf("flush_windows: nb=%d\n", offset - 1);
-#endif
-}
-
-void cpu_loop(CPUSPARCState *env)
-{
-    CPUState *cs = env_cpu(env);
-    int trapnr, ret, syscall_nr;
-    /* target_siginfo_t info; */
-
-    while (1) {
-        cpu_exec_start(cs);
-        trapnr = cpu_exec(cs);
-        cpu_exec_end(cs);
-        process_queued_cpu_work(cs);
-
-        switch (trapnr) {
-#ifndef TARGET_SPARC64
-        case 0x80:
-#else
-        /* FreeBSD uses 0x141 for syscalls too */
-        case 0x141:
-            if (bsd_type != target_freebsd) {
-                goto badtrap;
-            }
-            /* fallthrough */
-        case 0x100:
-#endif
-            syscall_nr = env->gregs[1];
-            if (bsd_type == target_freebsd)
-                ret = do_freebsd_syscall(env, syscall_nr,
-                                         env->regwptr[0], env->regwptr[1],
-                                         env->regwptr[2], env->regwptr[3],
-                                         env->regwptr[4], env->regwptr[5],
-                                         0, 0);
-            else if (bsd_type == target_netbsd)
-                ret = do_netbsd_syscall(env, syscall_nr,
-                                        env->regwptr[0], env->regwptr[1],
-                                        env->regwptr[2], env->regwptr[3],
-                                        env->regwptr[4], env->regwptr[5]);
-            else { /* if (bsd_type == target_openbsd) */
-#if defined(TARGET_SPARC64)
-                syscall_nr &= ~(TARGET_OPENBSD_SYSCALL_G7RFLAG |
-                                TARGET_OPENBSD_SYSCALL_G2RFLAG);
-#endif
-                ret = do_openbsd_syscall(env, syscall_nr,
-                                         env->regwptr[0], env->regwptr[1],
-                                         env->regwptr[2], env->regwptr[3],
-                                         env->regwptr[4], env->regwptr[5]);
-            }
-            if ((unsigned int)ret >= (unsigned int)(-515)) {
-                ret = -ret;
-#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
-                env->xcc |= PSR_CARRY;
-#else
-                env->psr |= PSR_CARRY;
-#endif
-            } else {
-#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
-                env->xcc &= ~PSR_CARRY;
-#else
-                env->psr &= ~PSR_CARRY;
-#endif
-            }
-            env->regwptr[0] = ret;
-            /* next instruction */
-#if defined(TARGET_SPARC64)
-            if (bsd_type == target_openbsd &&
-                env->gregs[1] & TARGET_OPENBSD_SYSCALL_G2RFLAG) {
-                env->pc = env->gregs[2];
-                env->npc = env->pc + 4;
-            } else if (bsd_type == target_openbsd &&
-                       env->gregs[1] & TARGET_OPENBSD_SYSCALL_G7RFLAG) {
-                env->pc = env->gregs[7];
-                env->npc = env->pc + 4;
-            } else {
-                env->pc = env->npc;
-                env->npc = env->npc + 4;
-            }
-#else
-            env->pc = env->npc;
-            env->npc = env->npc + 4;
-#endif
-            break;
-        case 0x83: /* flush windows */
-#ifdef TARGET_ABI32
-        case 0x103:
-#endif
-            flush_windows(env);
-            /* next instruction */
-            env->pc = env->npc;
-            env->npc = env->npc + 4;
-            break;
-#ifndef TARGET_SPARC64
-        case TT_WIN_OVF: /* window overflow */
-            save_window(env);
-            break;
-        case TT_WIN_UNF: /* window underflow */
-            restore_window(env);
-            break;
-        case TT_TFAULT:
-        case TT_DFAULT:
-            break;
-#else
-        case TT_SPILL: /* window overflow */
-            save_window(env);
-            break;
-        case TT_FILL: /* window underflow */
-            restore_window(env);
-            break;
-        case TT_TFAULT:
-        case TT_DFAULT:
-            break;
-#endif
-        case EXCP_INTERRUPT:
-            /* just indicate that signals should be handled asap */
-            break;
-        case EXCP_DEBUG:
-            {
-                gdb_handlesig(cs, TARGET_SIGTRAP);
-            }
-            break;
-        default:
-#ifdef TARGET_SPARC64
-        badtrap:
-#endif
-            printf("Unhandled trap: 0x%x\n", trapnr);
-            cpu_dump_state(cs, stderr, 0);
-            exit(1);
-        }
-        process_pending_signals(env);
-    }
-}
-
-#endif
 
 static void usage(void)
 {
diff --git a/bsd-user/sparc/target_arch_cpu.h b/bsd-user/sparc/target_arch_cpu.h
index dcf7694cba..5e3ecbed5c 100644
--- a/bsd-user/sparc/target_arch_cpu.h
+++ b/bsd-user/sparc/target_arch_cpu.h
@@ -19,4 +19,269 @@ 
 #ifndef _TARGET_ARCH_CPU_H_
 #define _TARGET_ARCH_CPU_H_
 
-#endif /* ! _TARGET_ARCH_CPU_H_ */
+#define SPARC64_STACK_BIAS 2047
+
+/* #define DEBUG_WIN */
+/*
+ * WARNING: dealing with register windows _is_ complicated. More info
+ * can be found at http://www.sics.se/~psm/sparcstack.html
+ */
+static inline int get_reg_index(CPUSPARCState *env, int cwp, int index)
+{
+    index = (index + cwp * 16) % (16 * env->nwindows);
+    /*
+     * wrap handling : if cwp is on the last window, then we use the
+     * registers 'after' the end
+     */
+    if (index < 8 && env->cwp == env->nwindows - 1) {
+        index += 16 * env->nwindows;
+    }
+    return index;
+}
+
+/* save the register window 'cwp1' */
+static inline void save_window_offset(CPUSPARCState *env, int cwp1)
+{
+    unsigned int i;
+    abi_ulong sp_ptr;
+
+    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
+#ifdef TARGET_SPARC64
+    if (sp_ptr & 3) {
+        sp_ptr += SPARC64_STACK_BIAS;
+    }
+#endif
+#if defined(DEBUG_WIN)
+    printf("win_overflow: sp_ptr=0x" TARGET_ABI_FMT_lx " save_cwp=%d\n",
+           sp_ptr, cwp1);
+#endif
+    for (i = 0; i < 16; i++) {
+        /* FIXME - what to do if put_user() fails? */
+        put_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
+        sp_ptr += sizeof(abi_ulong);
+    }
+}
+
+static void save_window(CPUSPARCState *env)
+{
+#ifndef TARGET_SPARC64
+    unsigned int new_wim;
+    new_wim = ((env->wim >> 1) | (env->wim << (env->nwindows - 1))) &
+        ((1LL << env->nwindows) - 1);
+    save_window_offset(env, cpu_cwp_dec(env, env->cwp - 2));
+    env->wim = new_wim;
+#else
+    /*
+     * cansave is zero if the spill trap handler is triggered by `save` and
+     * nonzero if triggered by a `flushw`
+     */
+    save_window_offset(env, cpu_cwp_dec(env, env->cwp - env->cansave - 2));
+    env->cansave++;
+    env->canrestore--;
+#endif
+}
+
+static void restore_window(CPUSPARCState *env)
+{
+#ifndef TARGET_SPARC64
+    unsigned int new_wim;
+#endif
+    unsigned int i, cwp1;
+    abi_ulong sp_ptr;
+
+#ifndef TARGET_SPARC64
+    new_wim = ((env->wim << 1) | (env->wim >> (env->nwindows - 1))) &
+        ((1LL << env->nwindows) - 1);
+#endif
+
+    /* restore the invalid window */
+    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+    sp_ptr = env->regbase[get_reg_index(env, cwp1, 6)];
+#ifdef TARGET_SPARC64
+    if (sp_ptr & 3) {
+        sp_ptr += SPARC64_STACK_BIAS;
+    }
+#endif
+#if defined(DEBUG_WIN)
+    printf("win_underflow: sp_ptr=0x" TARGET_ABI_FMT_lx " load_cwp=%d\n",
+           sp_ptr, cwp1);
+#endif
+    for (i = 0; i < 16; i++) {
+        /* FIXME - what to do if get_user() fails? */
+        get_user_ual(env->regbase[get_reg_index(env, cwp1, 8 + i)], sp_ptr);
+        sp_ptr += sizeof(abi_ulong);
+    }
+#ifdef TARGET_SPARC64
+    env->canrestore++;
+    if (env->cleanwin < env->nwindows - 1) {
+        env->cleanwin++;
+    }
+    env->cansave--;
+#else
+    env->wim = new_wim;
+#endif
+}
+
+static void flush_windows(CPUSPARCState *env)
+{
+    int offset, cwp1;
+
+    offset = 1;
+    for (;;) {
+        /* if restore would invoke restore_window(), then we can stop */
+        cwp1 = cpu_cwp_inc(env, env->cwp + offset);
+#ifndef TARGET_SPARC64
+        if (env->wim & (1 << cwp1)) {
+            break;
+        }
+#else
+        if (env->canrestore == 0) {
+            break;
+        }
+        env->cansave++;
+        env->canrestore--;
+#endif
+        save_window_offset(env, cwp1);
+        offset++;
+    }
+    cwp1 = cpu_cwp_inc(env, env->cwp + 1);
+#ifndef TARGET_SPARC64
+    /* set wim so that restore will reload the registers */
+    env->wim = 1 << cwp1;
+#endif
+#if defined(DEBUG_WIN)
+    printf("flush_windows: nb=%d\n", offset - 1);
+#endif
+}
+
+static void target_cpu_loop(CPUSPARCState *env)
+{
+    CPUState *cs = env_cpu(env);
+    int trapnr, ret, syscall_nr;
+    /* target_siginfo_t info; */
+
+    while (1) {
+        cpu_exec_start(cs);
+        trapnr = cpu_exec(cs);
+        cpu_exec_end(cs);
+        process_queued_cpu_work(cs);
+
+        switch (trapnr) {
+#ifndef TARGET_SPARC64
+        case 0x80:
+#else
+        /* FreeBSD uses 0x141 for syscalls too */
+        case 0x141:
+            if (bsd_type != target_freebsd) {
+                goto badtrap;
+            }
+            /* fallthrough */
+        case 0x100:
+#endif
+            syscall_nr = env->gregs[1];
+            if (bsd_type == target_freebsd)
+                ret = do_freebsd_syscall(env, syscall_nr,
+                                         env->regwptr[0], env->regwptr[1],
+                                         env->regwptr[2], env->regwptr[3],
+                                         env->regwptr[4], env->regwptr[5],
+                                         0, 0);
+            else if (bsd_type == target_netbsd)
+                ret = do_netbsd_syscall(env, syscall_nr,
+                                        env->regwptr[0], env->regwptr[1],
+                                        env->regwptr[2], env->regwptr[3],
+                                        env->regwptr[4], env->regwptr[5]);
+            else { /* if (bsd_type == target_openbsd) */
+#if defined(TARGET_SPARC64)
+                syscall_nr &= ~(TARGET_OPENBSD_SYSCALL_G7RFLAG |
+                                TARGET_OPENBSD_SYSCALL_G2RFLAG);
+#endif
+                ret = do_openbsd_syscall(env, syscall_nr,
+                                         env->regwptr[0], env->regwptr[1],
+                                         env->regwptr[2], env->regwptr[3],
+                                         env->regwptr[4], env->regwptr[5]);
+            }
+            if ((unsigned int)ret >= (unsigned int)(-515)) {
+                ret = -ret;
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+                env->xcc |= PSR_CARRY;
+#else
+                env->psr |= PSR_CARRY;
+#endif
+            } else {
+#if defined(TARGET_SPARC64) && !defined(TARGET_ABI32)
+                env->xcc &= ~PSR_CARRY;
+#else
+                env->psr &= ~PSR_CARRY;
+#endif
+            }
+            env->regwptr[0] = ret;
+            /* next instruction */
+#if defined(TARGET_SPARC64)
+            if (bsd_type == target_openbsd &&
+                env->gregs[1] & TARGET_OPENBSD_SYSCALL_G2RFLAG) {
+                env->pc = env->gregs[2];
+                env->npc = env->pc + 4;
+            } else if (bsd_type == target_openbsd &&
+                       env->gregs[1] & TARGET_OPENBSD_SYSCALL_G7RFLAG) {
+                env->pc = env->gregs[7];
+                env->npc = env->pc + 4;
+            } else {
+                env->pc = env->npc;
+                env->npc = env->npc + 4;
+            }
+#else
+            env->pc = env->npc;
+            env->npc = env->npc + 4;
+#endif
+            break;
+        case 0x83: /* flush windows */
+#ifdef TARGET_ABI32
+        case 0x103:
+#endif
+            flush_windows(env);
+            /* next instruction */
+            env->pc = env->npc;
+            env->npc = env->npc + 4;
+            break;
+#ifndef TARGET_SPARC64
+        case TT_WIN_OVF: /* window overflow */
+            save_window(env);
+            break;
+        case TT_WIN_UNF: /* window underflow */
+            restore_window(env);
+            break;
+        case TT_TFAULT:
+        case TT_DFAULT:
+            break;
+#else
+        case TT_SPILL: /* window overflow */
+            save_window(env);
+            break;
+        case TT_FILL: /* window underflow */
+            restore_window(env);
+            break;
+        case TT_TFAULT:
+        case TT_DFAULT:
+            break;
+#endif
+        case EXCP_INTERRUPT:
+            /* just indicate that signals should be handled asap */
+            break;
+        case EXCP_DEBUG:
+            {
+                gdb_handlesig(cs, TARGET_SIGTRAP);
+            }
+            break;
+        default:
+#ifdef TARGET_SPARC64
+        badtrap:
+#endif
+            printf("Unhandled trap: 0x%x\n", trapnr);
+            cpu_dump_state(cs, stderr, 0);
+            exit(1);
+        }
+        process_pending_signals(env);
+    }
+}
+
+#endif /* _TARGET_ARCH_CPU_H_ */