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authorRichard Henderson <rth@twiddle.net>2015-08-24 07:55:47 -0700
committerRichard Henderson <rth@twiddle.net>2015-09-15 07:45:34 -0700
commit0583b2332355dadb2d4681fe5a4eca882eb5b889 (patch)
treee0fa40969603242b560ba1630a9535ea7d75c4a5 /target-tilegx
parent03b217b168edfb45501146e98f60a6aea6bbb943 (diff)
downloadqemu-arm-0583b2332355dadb2d4681fe5a4eca882eb5b889.tar.gz
target-tilegx: Handle atomic instructions
Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <rth@twiddle.net>
Diffstat (limited to 'target-tilegx')
-rw-r--r--target-tilegx/cpu.h4
-rw-r--r--target-tilegx/translate.c80
2 files changed, 82 insertions, 2 deletions
diff --git a/target-tilegx/cpu.h b/target-tilegx/cpu.h
index 3a62d20106..b9f5082b95 100644
--- a/target-tilegx/cpu.h
+++ b/target-tilegx/cpu.h
@@ -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
diff --git a/target-tilegx/translate.c b/target-tilegx/translate.c
index 5819cc460e..7fb2ffb8bb 100644
--- a/target-tilegx/translate.c
+++ b/target-tilegx/translate.c
@@ -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);