initial sparc64 support - sparc fixes (Blue Swirl)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1251 c046a42c-6fe2-441c-8c8c-71466251a162

target-sparc/cpu.h

 #ifndef CPU_SPARC_H
 #define CPU_SPARC_H
 
+#include "config.h"
+
+#if !defined(TARGET_SPARC64)
 #define TARGET_LONG_BITS 32
+#define TARGET_FPREGS 32
+#define TARGET_FPREG_T float
+#else
+#define TARGET_LONG_BITS 64
+#define TARGET_FPREGS 64
+#define TARGET_FPREG_T double
+#endif
 
 #include "cpu-defs.h"
 
@@ -95,15 +105,14 @@
 #define NWINDOWS  32
 
 typedef struct CPUSPARCState {
-    uint32_t gregs[8]; /* general registers */
-    uint32_t *regwptr; /* pointer to current register window */
-    float    fpr[32];  /* floating point registers */
-    uint32_t pc;       /* program counter */
-    uint32_t npc;      /* next program counter */
-    uint32_t y;        /* multiply/divide register */
+    target_ulong gregs[8]; /* general registers */
+    target_ulong *regwptr; /* pointer to current register window */
+    TARGET_FPREG_T    fpr[TARGET_FPREGS];  /* floating point registers */
+    target_ulong pc;       /* program counter */
+    target_ulong npc;      /* next program counter */
+    target_ulong y;        /* multiply/divide register */
     uint32_t psr;      /* processor state register */
     uint32_t fsr;      /* FPU state register */
-    uint32_t T2;
     uint32_t cwp;      /* index of current register window (extracted
                           from PSR) */
     uint32_t wim;      /* window invalid mask */
@@ -118,11 +127,11 @@ typedef struct CPUSPARCState {
     int exception_index;
     int interrupt_index;
     int interrupt_request;
-    uint32_t exception_next_pc;
+    target_ulong exception_next_pc;
     struct TranslationBlock *current_tb;
     void *opaque;
     /* NOTE: we allow 8 more registers to handle wrapping */
-    uint32_t regbase[NWINDOWS * 16 + 8];
+    target_ulong regbase[NWINDOWS * 16 + 8];
 
     /* in order to avoid passing too many arguments to the memory
        write helpers, we store some rarely used information in the CPU
@@ -140,9 +149,12 @@ typedef struct CPUSPARCState {
     /* temporary float registers */
     float ft0, ft1, ft2;
     double dt0, dt1, dt2;
+#if defined(TARGET_SPARC64)
+    target_ulong t0, t1, t2;
+#endif
 
     /* ice debug support */
-    uint32_t breakpoints[MAX_BREAKPOINTS];
+    target_ulong breakpoints[MAX_BREAKPOINTS];
     int nb_breakpoints;
     int singlestep_enabled; /* XXX: should use CPU single step mode instead */
 
@@ -155,7 +167,7 @@ void cpu_get_fp64(uint64_t *pmant, uint16_t *pexp, double f);
 double cpu_put_fp64(uint64_t mant, uint16_t exp);
 
 /* Fake impl 0, version 4 */
-#define GET_PSR(env) ((0 << 28) | (4 << 24) | env->psr |		\
+#define GET_PSR(env) ((0 << 28) | (4 << 24) | (env->psr & PSR_ICC) |	\
 		      (env->psref? PSR_EF : 0) |			\
 		      (env->psrpil << 8) |				\
 		      (env->psrs? PSR_S : 0) |				\
@@ -167,7 +179,7 @@ void cpu_set_cwp(CPUSPARCState *env1, int new_cwp);
 #endif
 
 #define PUT_PSR(env, val) do { int _tmp = val;				\
-	env->psr = _tmp & ~PSR_ICC;					\
+	env->psr = _tmp & PSR_ICC;					\
 	env->psref = (_tmp & PSR_EF)? 1 : 0;				\
 	env->psrpil = (_tmp & PSR_PIL) >> 8;				\
 	env->psrs = (_tmp & PSR_S)? 1 : 0;				\

target-sparc/exec.h

@@ -3,9 +3,15 @@
 #include "dyngen-exec.h"
 
 register struct CPUSPARCState *env asm(AREG0);
+#ifdef TARGET_SPARC64
+#define T0 (env->t0)
+#define T1 (env->t1)
+#define T2 (env->t2)
+#else
 register uint32_t T0 asm(AREG1);
 register uint32_t T1 asm(AREG2);
 register uint32_t T2 asm(AREG3);
+#endif
 #define FT0 (env->ft0)
 #define FT1 (env->ft1)
 #define FT2 (env->ft2)
@@ -32,17 +38,19 @@ void do_fsqrts(void);
 void do_fsqrtd(void);
 void do_fcmps(void);
 void do_fcmpd(void);
-void do_ldd_kernel(uint32_t addr);
-void do_ldd_user(uint32_t addr);
-void do_ldd_raw(uint32_t addr);
+void do_ldd_kernel(target_ulong addr);
+void do_ldd_user(target_ulong addr);
+void do_ldd_raw(target_ulong addr);
 void do_interrupt(int intno, int is_int, int error_code, 
                   unsigned int next_eip, int is_hw);
 void raise_exception_err(int exception_index, int error_code);
 void raise_exception(int tt);
-void memcpy32(uint32_t *dst, const uint32_t *src);
-uint32_t mmu_probe(uint32_t address, int mmulev);
+void memcpy32(target_ulong *dst, const target_ulong *src);
+target_ulong mmu_probe(target_ulong address, int mmulev);
 void dump_mmu(void);
 void helper_debug();
+void do_wrpsr();
+void do_rdpsr();
 
 /* XXX: move that to a generic header */
 #if !defined(CONFIG_USER_ONLY)

target-sparc/helper.c

@@ -23,7 +23,7 @@
 //#define DEBUG_MMU
 
 /* Sparc MMU emulation */
-int cpu_sparc_handle_mmu_fault (CPUState *env, uint32_t address, int rw,
+int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                               int is_user, int is_softmmu);
 
 /* thread support */
@@ -109,13 +109,14 @@ static const int rw_table[2][8] = {
     { 0, 1, 0, 1, 0, 0, 0, 0 }
 };
 
-int get_physical_address (CPUState *env, uint32_t *physical, int *prot,
-			  int *access_index, uint32_t address, int rw,
+int get_physical_address (CPUState *env, target_phys_addr_t *physical, int *prot,
+			  int *access_index, target_ulong address, int rw,
 			  int is_user)
 {
     int access_perms = 0;
     target_phys_addr_t pde_ptr;
-    uint32_t pde, virt_addr;
+    uint32_t pde;
+    target_ulong virt_addr;
     int error_code = 0, is_dirty;
     unsigned long page_offset;
 
@@ -217,11 +218,12 @@ int get_physical_address (CPUState *env, uint32_t *physical, int *prot,
 }
 
 /* Perform address translation */
-int cpu_sparc_handle_mmu_fault (CPUState *env, uint32_t address, int rw,
+int cpu_sparc_handle_mmu_fault (CPUState *env, target_ulong address, int rw,
                               int is_user, int is_softmmu)
 {
     int exception = 0;
-    uint32_t virt_addr, paddr;
+    target_ulong virt_addr;
+    target_phys_addr_t paddr;
     unsigned long vaddr;
     int error_code = 0, prot, ret = 0, access_index;
 
@@ -252,7 +254,7 @@ int cpu_sparc_handle_mmu_fault (CPUState *env, uint32_t address, int rw,
     return error_code;
 }
 
-void memcpy32(uint32_t *dst, const uint32_t *src)
+void memcpy32(target_ulong *dst, const target_ulong *src)
 {
     dst[0] = src[0];
     dst[1] = src[1];
@@ -328,8 +330,13 @@ void do_interrupt(int intno, int is_int, int error_code,
     env->psret = 0;
     cwp = (env->cwp - 1) & (NWINDOWS - 1); 
     set_cwp(cwp);
-    env->regwptr[9] = env->pc - 4; // XXX?
-    env->regwptr[10] = env->pc;
+    if (intno & 0x80) {
+	env->regwptr[9] = env->pc;
+	env->regwptr[10] = env->npc;
+    } else {
+	env->regwptr[9] = env->pc - 4; // XXX?
+	env->regwptr[10] = env->pc;
+    }
     env->psrps = env->psrs;
     env->psrs = 1;
     env->tbr = (env->tbr & TBR_BASE_MASK) | (intno << 4);
@@ -343,7 +350,7 @@ void raise_exception_err(int exception_index, int error_code)
     raise_exception(exception_index);
 }
 
-uint32_t mmu_probe(uint32_t address, int mmulev)
+target_ulong mmu_probe(target_ulong address, int mmulev)
 {
     target_phys_addr_t pde_ptr;
     uint32_t pde;
@@ -408,30 +415,30 @@ uint32_t mmu_probe(uint32_t address, int mmulev)
 void dump_mmu(void)
 {
 #ifdef DEBUG_MMU
-    uint32_t pa, va, va1, va2;
-    int n, m, o;
-    target_phys_addr_t pde_ptr;
+     target_ulong va, va1, va2;
+     unsigned int n, m, o;
+     target_phys_addr_t pde_ptr, pa;
     uint32_t pde;
 
     printf("MMU dump:\n");
     pde_ptr = (env->mmuregs[1] << 4) + (env->mmuregs[2] << 4);
     pde = ldl_phys(pde_ptr);
-    printf("Root ptr: 0x%08x, ctx: %d\n", env->mmuregs[1] << 4, env->mmuregs[2]);
+    printf("Root ptr: " TARGET_FMT_lx ", ctx: %d\n", env->mmuregs[1] << 4, env->mmuregs[2]);
     for (n = 0, va = 0; n < 256; n++, va += 16 * 1024 * 1024) {
 	pde_ptr = mmu_probe(va, 2);
 	if (pde_ptr) {
 	    pa = cpu_get_phys_page_debug(env, va);
-	    printf("VA: 0x%08x, PA: 0x%08x PDE: 0x%08x\n", va, pa, pde_ptr);
+ 	    printf("VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va, pa, pde_ptr);
 	    for (m = 0, va1 = va; m < 64; m++, va1 += 256 * 1024) {
 		pde_ptr = mmu_probe(va1, 1);
 		if (pde_ptr) {
 		    pa = cpu_get_phys_page_debug(env, va1);
-		    printf(" VA: 0x%08x, PA: 0x%08x PDE: 0x%08x\n", va1, pa, pde_ptr);
+ 		    printf(" VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PDE: " TARGET_FMT_lx "\n", va1, pa, pde_ptr);
 		    for (o = 0, va2 = va1; o < 64; o++, va2 += 4 * 1024) {
 			pde_ptr = mmu_probe(va2, 0);
 			if (pde_ptr) {
 			    pa = cpu_get_phys_page_debug(env, va2);
-			    printf("  VA: 0x%08x, PA: 0x%08x PTE: 0x%08x\n", va2, pa, pde_ptr);
+ 			    printf("  VA: " TARGET_FMT_lx ", PA: " TARGET_FMT_lx " PTE: " TARGET_FMT_lx "\n", va2, pa, pde_ptr);
 			}
 		    }
 		}

target-sparc/op.c

@@ -217,7 +217,7 @@
 
 #define EIP (env->pc)
 
-#define FLAG_SET(x) (env->psr&x)?1:0
+#define FLAG_SET(x) ((env->psr&x)?1:0)
 #define FFLAG_SET(x) ((env->fsr&x)?1:0)
 
 void OPPROTO op_movl_T0_0(void)
@@ -225,11 +225,6 @@ void OPPROTO op_movl_T0_0(void)
     T0 = 0;
 }
 
-void OPPROTO op_movl_T0_1(void)
-{
-    T0 = 1;
-}
-
 void OPPROTO op_movl_T0_im(void)
 {
     T0 = PARAM1;
@@ -245,40 +240,51 @@ void OPPROTO op_movl_T2_im(void)
     T2 = PARAM1;
 }
 
-void OPPROTO op_addl_T1_im(void)
+void OPPROTO op_add_T1_T0(void)
 {
-    T1 += PARAM1;
+    T0 += T1;
 }
 
-void OPPROTO op_addl_T1_T2(void)
+void OPPROTO op_add_T1_T0_cc(void)
 {
-    T1 += T2;
-}
+    target_ulong src1;
 
-void OPPROTO op_subl_T1_T2(void)
-{
-    T1 -= T2;
+    src1 = T0;
+    T0 += T1;
+    env->psr = 0;
+    if (!T0)
+	env->psr |= PSR_ZERO;
+    if ((int32_t) T0 < 0)
+	env->psr |= PSR_NEG;
+    if (T0 < src1)
+	env->psr |= PSR_CARRY;
+    if (((src1 ^ T1 ^ -1) & (src1 ^ T0)) & (1 << 31))
+	env->psr |= PSR_OVF;
+    /* V9 xcc */
+    FORCE_RET();
 }
 
-void OPPROTO op_add_T1_T0(void)
+void OPPROTO op_addx_T1_T0(void)
 {
-    T0 += T1;
+    T0 += T1 + FLAG_SET(PSR_CARRY);
 }
 
-void OPPROTO op_add_T1_T0_cc(void)
+void OPPROTO op_addx_T1_T0_cc(void)
 {
-    unsigned int src1;
+    target_ulong src1;
+
     src1 = T0;
-    T0 += T1;
+    T0 += T1 + FLAG_SET(PSR_CARRY);
     env->psr = 0;
     if (!T0)
 	env->psr |= PSR_ZERO;
-    if ((int) T0 < 0)
+    if ((int32_t) T0 < 0)
 	env->psr |= PSR_NEG;
     if (T0 < src1)
 	env->psr |= PSR_CARRY;
     if (((src1 ^ T1 ^ -1) & (src1 ^ T0)) & (1 << 31))
 	env->psr |= PSR_OVF;
+    /* V9 xcc */
     FORCE_RET();
 }
 
@@ -289,19 +295,44 @@ void OPPROTO op_sub_T1_T0(void)
 
 void OPPROTO op_sub_T1_T0_cc(void)
 {
-    unsigned int src1;
+    target_ulong src1;
 
     src1 = T0;
     T0 -= T1;
     env->psr = 0;
     if (!T0)
 	env->psr |= PSR_ZERO;
-    if ((int) T0 < 0)
+    if ((int32_t) T0 < 0)
 	env->psr |= PSR_NEG;
     if (src1 < T1)
 	env->psr |= PSR_CARRY;
     if (((src1 ^ T1) & (src1 ^ T0)) & (1 << 31))
 	env->psr |= PSR_OVF;
+    /* V9 xcc */
+    FORCE_RET();
+}
+
+void OPPROTO op_subx_T1_T0(void)
+{
+    T0 -= T1 + FLAG_SET(PSR_CARRY);
+}
+
+void OPPROTO op_subx_T1_T0_cc(void)
+{
+    target_ulong src1;
+
+    src1 = T0;
+    T0 -= T1 + FLAG_SET(PSR_CARRY);
+    env->psr = 0;
+    if (!T0)
+	env->psr |= PSR_ZERO;
+    if ((int32_t) T0 < 0)
+	env->psr |= PSR_NEG;
+    if (src1 < T1)
+	env->psr |= PSR_CARRY;
+    if (((src1 ^ T1) & (src1 ^ T0)) & (1 << 31))
+	env->psr |= PSR_OVF;
+    /* V9 xcc */
     FORCE_RET();
 }
 
@@ -335,15 +366,10 @@ void OPPROTO op_xnor_T1_T0(void)
     T0 ^= ~T1;
 }
 
-void OPPROTO op_addx_T1_T0(void)
-{
-    T0 += T1 + ((env->psr & PSR_CARRY) ? 1 : 0);
-}
-
 void OPPROTO op_umul_T1_T0(void)
 {
     uint64_t res;
-    res = (uint64_t) T0 *(uint64_t) T1;
+    res = (uint64_t) T0 * (uint64_t) T1;
     T0 = res & 0xffffffff;
     env->y = res >> 32;
 }
@@ -358,7 +384,9 @@ void OPPROTO op_smul_T1_T0(void)
 
 void OPPROTO op_mulscc_T1_T0(void)
 {
-    unsigned int b1, N, V, b2, src1;
+    unsigned int b1, N, V, b2;
+    target_ulong src1;
+
     N = FLAG_SET(PSR_NEG);
     V = FLAG_SET(PSR_OVF);
     b1 = N ^ V;
@@ -372,7 +400,7 @@ void OPPROTO op_mulscc_T1_T0(void)
     env->psr = 0;
     if (!T0)
 	env->psr |= PSR_ZERO;
-    if ((int) T0 < 0)
+    if ((int32_t) T0 < 0)
 	env->psr |= PSR_NEG;
     if (T0 < src1)
 	env->psr |= PSR_CARRY;
@@ -405,11 +433,11 @@ void OPPROTO op_sdiv_T1_T0(void)
     int64_t x0;
     int32_t x1;
 
-    x0 = T0 | ((uint64_t) (env->y) << 32);
+    x0 = T0 | ((int64_t) (env->y) << 32);
     x1 = T1;
     x0 = x0 / x1;
     if ((int32_t) x0 != x0) {
-	T0 = x0 >> 63;
+	T0 = x0 < 0? 0x80000000: 0x7fffffff;
 	T1 = 1;
     } else {
 	T0 = x0;
@@ -423,39 +451,22 @@ void OPPROTO op_div_cc(void)
     env->psr = 0;
     if (!T0)
 	env->psr |= PSR_ZERO;
-    if ((int) T0 < 0)
+    if ((int32_t) T0 < 0)
 	env->psr |= PSR_NEG;
     if (T1)
 	env->psr |= PSR_OVF;
+    /* V9 xcc */
     FORCE_RET();
 }
 
-void OPPROTO op_subx_T1_T0(void)
-{
-    T0 -= T1 + ((env->psr & PSR_CARRY) ? 1 : 0);
-}
-
 void OPPROTO op_logic_T0_cc(void)
 {
     env->psr = 0;
     if (!T0)
 	env->psr |= PSR_ZERO;
-    if ((int) T0 < 0)
-	env->psr |= PSR_NEG;
-    FORCE_RET();
-}
-
-void OPPROTO op_set_flags(void)
-{
-    env->psr = 0;
-    if (!T0)
-	env->psr |= PSR_ZERO;
-    if ((unsigned int) T0 < (unsigned int) T1)
-	env->psr |= PSR_CARRY;
-    if ((int) T0 < (int) T1)
-	env->psr |= PSR_OVF;
-    if ((int) T0 < 0)
+    if ((int32_t) T0 < 0)
 	env->psr |= PSR_NEG;
+    /* V9 xcc */
     FORCE_RET();
 }
 
@@ -519,12 +530,12 @@ void OPPROTO op_wrwim(void)
 
 void OPPROTO op_rdpsr(void)
 {
-    T0 = GET_PSR(env);
+    do_rdpsr();
 }
 
 void OPPROTO op_wrpsr(void)
 {
-    PUT_PSR(env,T0);
+    do_wrpsr();
     FORCE_RET();
 }
 
@@ -555,7 +566,7 @@ void raise_exception(int tt)
    handling ? */
 void OPPROTO op_save(void)
 {
-    int cwp;
+    uint32_t cwp;
     cwp = (env->cwp - 1) & (NWINDOWS - 1); 
     if (env->wim & (1 << cwp)) {
         raise_exception(TT_WIN_OVF);
@@ -566,7 +577,7 @@ void OPPROTO op_save(void)
 
 void OPPROTO op_restore(void)
 {
-    int cwp;
+    uint32_t cwp;
     cwp = (env->cwp + 1) & (NWINDOWS - 1); 
     if (env->wim & (1 << cwp)) {
         raise_exception(TT_WIN_UNF);
@@ -626,84 +637,84 @@ void OPPROTO op_exit_tb(void)
 
 void OPPROTO op_eval_be(void)
 {
-    T2 = (env->psr & PSR_ZERO);
+    T2 = FLAG_SET(PSR_ZERO);
 }
 
 void OPPROTO op_eval_ble(void)
 {
-    unsigned int Z = FLAG_SET(PSR_ZERO), N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
+    target_ulong Z = FLAG_SET(PSR_ZERO), N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
     
     T2 = Z | (N ^ V);
 }
 
 void OPPROTO op_eval_bl(void)
 {
-    unsigned int N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
+    target_ulong N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
 
     T2 = N ^ V;
 }
 
 void OPPROTO op_eval_bleu(void)
 {
-    unsigned int Z = FLAG_SET(PSR_ZERO), C = FLAG_SET(PSR_CARRY);
+    target_ulong Z = FLAG_SET(PSR_ZERO), C = FLAG_SET(PSR_CARRY);
 
     T2 = C | Z;
 }
 
 void OPPROTO op_eval_bcs(void)
 {
-    T2 = (env->psr & PSR_CARRY);
+    T2 = FLAG_SET(PSR_CARRY);
 }
 
 void OPPROTO op_eval_bvs(void)
 {
-    T2 = (env->psr & PSR_OVF);
+    T2 = FLAG_SET(PSR_OVF);
 }
 
 void OPPROTO op_eval_bneg(void)
 {
-    T2 = (env->psr & PSR_NEG);
+    T2 = FLAG_SET(PSR_NEG);
 }
 
 void OPPROTO op_eval_bne(void)
 {
-    T2 = !(env->psr & PSR_ZERO);
+    T2 = !FLAG_SET(PSR_ZERO);
 }
 
 void OPPROTO op_eval_bg(void)
 {
-    unsigned int Z = FLAG_SET(PSR_ZERO), N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
+    target_ulong Z = FLAG_SET(PSR_ZERO), N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
 
     T2 = !(Z | (N ^ V));
 }
 
 void OPPROTO op_eval_bge(void)
 {
-    unsigned int N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
+    target_ulong N = FLAG_SET(PSR_NEG), V = FLAG_SET(PSR_OVF);
 
     T2 = !(N ^ V);
 }
 
 void OPPROTO op_eval_bgu(void)
 {
-    unsigned int Z = FLAG_SET(PSR_ZERO), C = FLAG_SET(PSR_CARRY);
+    target_ulong Z = FLAG_SET(PSR_ZERO), C = FLAG_SET(PSR_CARRY);
 
     T2 = !(C | Z);
 }
 
 void OPPROTO op_eval_bcc(void)
 {
-    T2 = !(env->psr & PSR_CARRY);
+    T2 = !FLAG_SET(PSR_CARRY);
 }
 
 void OPPROTO op_eval_bpos(void)
 {
-    T2 = !(env->psr & PSR_NEG);
+    T2 = !FLAG_SET(PSR_NEG);
 }
 
 void OPPROTO op_eval_bvc(void)
 {
-    T2 = !(env->psr & PSR_OVF);
+    T2 = !FLAG_SET(PSR_OVF);
 }
 
 /* FCC1:FCC0: 0 =, 1 <, 2 >, 3 u */
@@ -792,16 +803,6 @@ void OPPROTO op_eval_fbo(void)
     T2 = !(FFLAG_SET(FSR_FCC0) & FFLAG_SET(FSR_FCC1));
 }
 
-void OPPROTO op_movl_T2_0(void)
-{
-    T2 = 0;
-}
-
-void OPPROTO op_movl_T2_1(void)
-{
-    T2 = 1;
-}
-
 void OPPROTO op_jmp_im(void)
 {
     env->pc = PARAM1;
@@ -845,10 +846,10 @@ void OPPROTO op_branch_a(void)
 {
     if (T2) {
 	env->npc = PARAM2; /* XXX: optimize */
-        JUMP_TB(op_generic_branch_a, PARAM1, 0, PARAM3);
+        JUMP_TB(op_branch_a, PARAM1, 0, PARAM3);
     } else {
 	env->npc = PARAM3 + 8; /* XXX: optimize */
-        JUMP_TB(op_generic_branch_a, PARAM1, 1, PARAM3 + 4);
+        JUMP_TB(op_branch_a, PARAM1, 1, PARAM3 + 4);
     }
     FORCE_RET();
 }

target-sparc/op_helper.c

@@ -209,7 +209,8 @@ void helper_st_asi(int asi, int size, int sign)
 
 void helper_rett()
 {
-    int cwp;
+    unsigned int cwp;
+