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target-tilegx: Handle atomic instructions 

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson 2015-08-24 07:55:47 -07:00
parent 03b217b168
commit 0583b23323
3 changed files with 248 additions and 2 deletions
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166
linux-user/main.c
View File

@ -3436,6 +3436,148 @@ static void gen_sigill_reg(CPUTLGState *env)
queue_signal(env, info.si_signo, &info);
}
static void set_regval(CPUTLGState *env, uint8_t reg, uint64_t val)
{
if (unlikely(reg >= TILEGX_R_COUNT)) {
switch (reg) {
case TILEGX_R_SN:
case TILEGX_R_ZERO:
return;
case TILEGX_R_IDN0:
case TILEGX_R_IDN1:
case TILEGX_R_UDN0:
case TILEGX_R_UDN1:
case TILEGX_R_UDN2:
case TILEGX_R_UDN3:
gen_sigill_reg(env);
return;
default:
g_assert_not_reached();
}
}
env->regs[reg] = val;
}
/*
* Compare the 8-byte contents of the CmpValue SPR with the 8-byte value in
* memory at the address held in the first source register. If the values are
* not equal, then no memory operation is performed. If the values are equal,
* the 8-byte quantity from the second source register is written into memory
* at the address held in the first source register. In either case, the result
* of the instruction is the value read from memory. The compare and write to
* memory are atomic and thus can be used for synchronization purposes. This
* instruction only operates for addresses aligned to a 8-byte boundary.
* Unaligned memory access causes an Unaligned Data Reference interrupt.
*
* Functional Description (64-bit)
* uint64_t memVal = memoryReadDoubleWord (rf[SrcA]);
* rf[Dest] = memVal;
* if (memVal == SPR[CmpValueSPR])
* memoryWriteDoubleWord (rf[SrcA], rf[SrcB]);
*
* Functional Description (32-bit)
* uint64_t memVal = signExtend32 (memoryReadWord (rf[SrcA]));
* rf[Dest] = memVal;
* if (memVal == signExtend32 (SPR[CmpValueSPR]))
* memoryWriteWord (rf[SrcA], rf[SrcB]);
*
*
* This function also processes exch and exch4 which need not process SPR.
*/
static void do_exch(CPUTLGState *env, bool quad, bool cmp)
{
target_ulong addr;
target_long val, sprval;
start_exclusive();
addr = env->atomic_srca;
if (quad ? get_user_s64(val, addr) : get_user_s32(val, addr)) {
goto sigsegv_maperr;
}
if (cmp) {
if (quad) {
sprval = env->spregs[TILEGX_SPR_CMPEXCH];
} else {
sprval = sextract64(env->spregs[TILEGX_SPR_CMPEXCH], 0, 32);
}
}
if (!cmp || val == sprval) {
target_long valb = env->atomic_srcb;
if (quad ? put_user_u64(valb, addr) : put_user_u32(valb, addr)) {
goto sigsegv_maperr;
}
}
set_regval(env, env->atomic_dstr, val);
end_exclusive();
return;
sigsegv_maperr:
end_exclusive();
gen_sigsegv_maperr(env, addr);
}
static void do_fetch(CPUTLGState *env, int trapnr, bool quad)
{
int8_t write = 1;
target_ulong addr;
target_long val, valb;
start_exclusive();
addr = env->atomic_srca;
valb = env->atomic_srcb;
if (quad ? get_user_s64(val, addr) : get_user_s32(val, addr)) {
goto sigsegv_maperr;
}
switch (trapnr) {
case TILEGX_EXCP_OPCODE_FETCHADD:
case TILEGX_EXCP_OPCODE_FETCHADD4:
valb += val;
break;
case TILEGX_EXCP_OPCODE_FETCHADDGEZ:
valb += val;
if (valb < 0) {
write = 0;
}
break;
case TILEGX_EXCP_OPCODE_FETCHADDGEZ4:
valb += val;
if ((int32_t)valb < 0) {
write = 0;
}
break;
case TILEGX_EXCP_OPCODE_FETCHAND:
case TILEGX_EXCP_OPCODE_FETCHAND4:
valb &= val;
break;
case TILEGX_EXCP_OPCODE_FETCHOR:
case TILEGX_EXCP_OPCODE_FETCHOR4:
valb |= val;
break;
default:
g_assert_not_reached();
}
if (write) {
if (quad ? put_user_u64(valb, addr) : put_user_u32(valb, addr)) {
goto sigsegv_maperr;
}
}
set_regval(env, env->atomic_dstr, val);
end_exclusive();
return;
sigsegv_maperr:
end_exclusive();
gen_sigsegv_maperr(env, addr);
}
void cpu_loop(CPUTLGState *env)
{
CPUState *cs = CPU(tilegx_env_get_cpu(env));
@ -3456,6 +3598,30 @@ void cpu_loop(CPUTLGState *env)
? - env->regs[TILEGX_R_RE]
: 0;
break;
case TILEGX_EXCP_OPCODE_EXCH:
do_exch(env, true, false);
break;
case TILEGX_EXCP_OPCODE_EXCH4:
do_exch(env, false, false);
break;
case TILEGX_EXCP_OPCODE_CMPEXCH:
do_exch(env, true, true);
break;
case TILEGX_EXCP_OPCODE_CMPEXCH4:
do_exch(env, false, true);
break;
case TILEGX_EXCP_OPCODE_FETCHADD:
case TILEGX_EXCP_OPCODE_FETCHADDGEZ:
case TILEGX_EXCP_OPCODE_FETCHAND:
case TILEGX_EXCP_OPCODE_FETCHOR:
do_fetch(env, trapnr, true);
break;
case TILEGX_EXCP_OPCODE_FETCHADD4:
case TILEGX_EXCP_OPCODE_FETCHADDGEZ4:
case TILEGX_EXCP_OPCODE_FETCHAND4:
case TILEGX_EXCP_OPCODE_FETCHOR4:
do_fetch(env, trapnr, false);
break;
case TILEGX_EXCP_REG_IDN_ACCESS:
case TILEGX_EXCP_REG_UDN_ACCESS:
gen_sigill_reg(env);

4
target-tilegx/cpu.h
View File

@ -87,7 +87,9 @@ typedef struct CPUTLGState {
uint64_t pc; /* Current pc */
#if defined(CONFIG_USER_ONLY)
uint32_t excparam; /* exception parameter */
uint64_t atomic_srca; /* Arguments to atomic "exceptions" */
uint64_t atomic_srcb;
uint32_t atomic_dstr;
uint64_t excaddr; /* exception address */
#endif

80
target-tilegx/translate.c
View File

@ -61,6 +61,7 @@ typedef struct {
int num_wb;
int mmuidx;
bool exit_tb;
TileExcp atomic_excp;
struct {
TCGCond cond; /* branch condition */
@ -180,6 +181,32 @@ static void gen_saturate_op(TCGv tdest, TCGv tsrca, TCGv tsrcb,
tcg_temp_free(t0);
}
static void gen_atomic_excp(DisasContext *dc, unsigned dest, TCGv tdest,
TCGv tsrca, TCGv tsrcb, TileExcp excp)
{
#ifdef CONFIG_USER_ONLY
TCGv_i32 t;
tcg_gen_st_tl(tsrca, cpu_env, offsetof(CPUTLGState, atomic_srca));
tcg_gen_st_tl(tsrcb, cpu_env, offsetof(CPUTLGState, atomic_srcb));
t = tcg_const_i32(dest);
tcg_gen_st_i32(t, cpu_env, offsetof(CPUTLGState, atomic_dstr));
tcg_temp_free_i32(t);
/* We're going to write the real result in the exception. But in
the meantime we've already created a writeback register, and
we don't want that to remain uninitialized. */
tcg_gen_movi_tl(tdest, 0);
/* Note that we need to delay issuing the exception that implements
the atomic operation until after writing back the results of the
instruction occupying the X0 pipe. */
dc->atomic_excp = excp;
#else
gen_exception(dc, TILEGX_EXCP_OPCODE_UNIMPLEMENTED);
#endif
}
/* Shift the 128-bit value TSRCA:TSRCD right by the number of bytes
specified by the bottom 3 bits of TSRCB, and set TDEST to the
low 64 bits of the resulting value. */
@ -591,8 +618,15 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
mnemonic = "cmpeq";
break;
case OE_RRR(CMPEXCH4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_CMPEXCH4);
mnemonic = "cmpexch4";
break;
case OE_RRR(CMPEXCH, 0, X1):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_CMPEXCH);
mnemonic = "cmpexch";
break;
case OE_RRR(CMPLES, 0, X0):
case OE_RRR(CMPLES, 0, X1):
case OE_RRR(CMPLES, 2, Y0):
@ -658,7 +692,15 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
mnemonic = "dblalign";
break;
case OE_RRR(EXCH4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_EXCH4);
mnemonic = "exch4";
break;
case OE_RRR(EXCH, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_EXCH);
mnemonic = "exch";
break;
case OE_RRR(FDOUBLE_ADDSUB, 0, X0):
case OE_RRR(FDOUBLE_ADD_FLAGS, 0, X0):
case OE_RRR(FDOUBLE_MUL_FLAGS, 0, X0):
@ -667,14 +709,47 @@ static TileExcp gen_rrr_opcode(DisasContext *dc, unsigned opext,
case OE_RRR(FDOUBLE_SUB_FLAGS, 0, X0):
case OE_RRR(FDOUBLE_UNPACK_MAX, 0, X0):
case OE_RRR(FDOUBLE_UNPACK_MIN, 0, X0):
return TILEGX_EXCP_OPCODE_UNIMPLEMENTED;
case OE_RRR(FETCHADD4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHADD4);
mnemonic = "fetchadd4";
break;
case OE_RRR(FETCHADDGEZ4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHADDGEZ4);
mnemonic = "fetchaddgez4";
break;
case OE_RRR(FETCHADDGEZ, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHADDGEZ);
mnemonic = "fetchaddgez";
break;
case OE_RRR(FETCHADD, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHADD);
mnemonic = "fetchadd";
break;
case OE_RRR(FETCHAND4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHAND4);
mnemonic = "fetchand4";
break;
case OE_RRR(FETCHAND, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHAND);
mnemonic = "fetchand";
break;
case OE_RRR(FETCHOR4, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHOR4);
mnemonic = "fetchor4";
break;
case OE_RRR(FETCHOR, 0, X1):
gen_atomic_excp(dc, dest, tdest, tsrca, tsrcb,
TILEGX_EXCP_OPCODE_FETCHOR);
mnemonic = "fetchor";
break;
case OE_RRR(FSINGLE_ADD1, 0, X0):
case OE_RRR(FSINGLE_ADDSUB2, 0, X0):
case OE_RRR(FSINGLE_MUL1, 0, X0):
@ -1936,6 +2011,8 @@ static void translate_one_bundle(DisasContext *dc, uint64_t bundle)
tcg_temp_free_i64(dc->jmp.dest);
tcg_gen_exit_tb(0);
dc->exit_tb = true;
} else if (dc->atomic_excp != TILEGX_EXCP_NONE) {
gen_exception(dc, dc->atomic_excp);
}
}
@ -1956,6 +2033,7 @@ static inline void gen_intermediate_code_internal(TileGXCPU *cpu,
dc->pc = pc_start;
dc->mmuidx = 0;
dc->exit_tb = false;
dc->atomic_excp = TILEGX_EXCP_NONE;
dc->jmp.cond = TCG_COND_NEVER;
TCGV_UNUSED_I64(dc->jmp.dest);
TCGV_UNUSED_I64(dc->jmp.val1);