Merge remote-tracking branch 'remotes/rth-gitlab/tags/pull-hex-20210218' into staging

Initial commit for the Qualcomm Hexagon processor.

# gpg: Signature made Thu 18 Feb 2021 16:26:52 GMT
# gpg:                using RSA key 7A481E78868B4DB6A85A05C064DF38E8AF7E215F
# gpg:                issuer "richard.henderson@linaro.org"
# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [full]
# Primary key fingerprint: 7A48 1E78 868B 4DB6 A85A  05C0 64DF 38E8 AF7E 215F

* remotes/rth-gitlab/tags/pull-hex-20210218: (35 commits)
  Hexagon build infrastructure
  Hexagon (tests/tcg/hexagon) TCG tests - floating point
  Hexagon (tests/tcg/hexagon) TCG tests - atomics/load/store/misc
  Hexagon (tests/tcg/hexagon) TCG tests - multiarch
  Hexagon (linux-user/hexagon) Linux user emulation
  Hexagon (target/hexagon) translation
  Hexagon (target/hexagon) TCG for floating point instructions
  Hexagon (target/hexagon) TCG for instructions with multiple definitions
  Hexagon (target/hexagon) TCG generation
  Hexagon (target/hexagon) instruction classes
  Hexagon (target/hexagon) macros
  Hexagon (target/hexagon) opcode data structures
  Hexagon (target/hexagon) generater phase 4 - decode tree
  Hexagon (target/hexagon) generator phase 3 - C preprocessor for decode tree
  Hexagon (target/hexagon) generator phase 2 - generate header files
  Hexagon (target/hexagon) generator phase 1 - C preprocessor for semantics
  Hexagon (target/hexagon/imported) arch import
  Hexagon (target/hexagon/fma_emu.[ch]) utility functions
  Hexagon (target/hexagon/conv_emu.[ch]) utility functions
  Hexagon (target/hexagon/arch.[ch]) utility functions
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

1 files changed, 220 insertions, 0 deletions

diff --git a/target/hexagon/gen_helper_funcs.py b/target/hexagon/gen_helper_funcs.py
new file mode 100755
index 0000000000..2b1c5d8e3e
--- /dev/null
+++ b/target/hexagon/gen_helper_funcs.py
@@ -0,0 +1,220 @@
+#!/usr/bin/env python3
+
+##
+##  Copyright(c) 2019-2021 Qualcomm Innovation Center, Inc. All Rights Reserved.
+##
+##  This program is free software; you can redistribute it and/or modify
+##  it under the terms of the GNU General Public License as published by
+##  the Free Software Foundation; either version 2 of the License, or
+##  (at your option) any later version.
+##
+##  This program is distributed in the hope that it will be useful,
+##  but WITHOUT ANY WARRANTY; without even the implied warranty of
+##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+##  GNU General Public License for more details.
+##
+##  You should have received a copy of the GNU General Public License
+##  along with this program; if not, see <http://www.gnu.org/licenses/>.
+##
+
+import sys
+import re
+import string
+import hex_common
+
+##
+## Helpers for gen_helper_function
+##
+def gen_decl_ea(f):
+    f.write("    uint32_t EA;\n")
+
+def gen_helper_return_type(f,regtype,regid,regno):
+    if regno > 1 : f.write(", ")
+    f.write("int32_t")
+
+def gen_helper_return_type_pair(f,regtype,regid,regno):
+    if regno > 1 : f.write(", ")
+    f.write("int64_t")
+
+def gen_helper_arg(f,regtype,regid,regno):
+    if regno > 0 : f.write(", " )
+    f.write("int32_t %s%sV" % (regtype,regid))
+
+def gen_helper_arg_new(f,regtype,regid,regno):
+    if regno >= 0 : f.write(", " )
+    f.write("int32_t %s%sN" % (regtype,regid))
+
+def gen_helper_arg_pair(f,regtype,regid,regno):
+    if regno >= 0 : f.write(", ")
+    f.write("int64_t %s%sV" % (regtype,regid))
+
+def gen_helper_arg_opn(f,regtype,regid,i,tag):
+    if (hex_common.is_pair(regid)):
+        gen_helper_arg_pair(f,regtype,regid,i)
+    elif (hex_common.is_single(regid)):
+        if hex_common.is_old_val(regtype, regid, tag):
+            gen_helper_arg(f,regtype,regid,i)
+        elif hex_common.is_new_val(regtype, regid, tag):
+            gen_helper_arg_new(f,regtype,regid,i)
+        else:
+            print("Bad register parse: ",regtype,regid,toss,numregs)
+    else:
+        print("Bad register parse: ",regtype,regid,toss,numregs)
+
+def gen_helper_arg_imm(f,immlett):
+    f.write(", int32_t %s" % (hex_common.imm_name(immlett)))
+
+def gen_helper_dest_decl(f,regtype,regid,regno,subfield=""):
+    f.write("    int32_t %s%sV%s = 0;\n" % \
+        (regtype,regid,subfield))
+
+def gen_helper_dest_decl_pair(f,regtype,regid,regno,subfield=""):
+    f.write("    int64_t %s%sV%s = 0;\n" % \
+        (regtype,regid,subfield))
+
+def gen_helper_dest_decl_opn(f,regtype,regid,i):
+    if (hex_common.is_pair(regid)):
+        gen_helper_dest_decl_pair(f,regtype,regid,i)
+    elif (hex_common.is_single(regid)):
+        gen_helper_dest_decl(f,regtype,regid,i)
+    else:
+        print("Bad register parse: ",regtype,regid,toss,numregs)
+
+def gen_helper_return(f,regtype,regid,regno):
+    f.write("    return %s%sV;\n" % (regtype,regid))
+
+def gen_helper_return_pair(f,regtype,regid,regno):
+    f.write("    return %s%sV;\n" % (regtype,regid))
+
+def gen_helper_return_opn(f, regtype, regid, i):
+    if (hex_common.is_pair(regid)):
+        gen_helper_return_pair(f,regtype,regid,i)
+    elif (hex_common.is_single(regid)):
+        gen_helper_return(f,regtype,regid,i)
+    else:
+        print("Bad register parse: ",regtype,regid,toss,numregs)
+
+##
+## Generate the TCG code to call the helper
+##     For A2_add: Rd32=add(Rs32,Rt32), { RdV=RsV+RtV;}
+##     We produce:
+##       int32_t HELPER(A2_add)(CPUHexagonState *env, int32_t RsV, int32_t RtV)
+##       {
+##           uint32_t slot __attribute__(unused)) = 4;
+##           int32_t RdV = 0;
+##           { RdV=RsV+RtV;}
+##           COUNT_HELPER(A2_add);
+##           return RdV;
+##       }
+##
+def gen_helper_function(f, tag, tagregs, tagimms):
+    regs = tagregs[tag]
+    imms = tagimms[tag]
+
+    numresults = 0
+    numscalarresults = 0
+    numscalarreadwrite = 0
+    for regtype,regid,toss,numregs in regs:
+        if (hex_common.is_written(regid)):
+            numresults += 1
+            if (hex_common.is_scalar_reg(regtype)):
+                numscalarresults += 1
+        if (hex_common.is_readwrite(regid)):
+            if (hex_common.is_scalar_reg(regtype)):
+                numscalarreadwrite += 1
+
+    if (numscalarresults > 1):
+        ## The helper is bogus when there is more than one result
+        f.write("void HELPER(%s)(CPUHexagonState *env) { BOGUS_HELPER(%s); }\n"
+                % (tag, tag))
+    else:
+        ## The return type of the function is the type of the destination
+        ## register
+        i=0
+        for regtype,regid,toss,numregs in regs:
+            if (hex_common.is_written(regid)):
+                if (hex_common.is_pair(regid)):
+                    gen_helper_return_type_pair(f,regtype,regid,i)
+                elif (hex_common.is_single(regid)):
+                    gen_helper_return_type(f,regtype,regid,i)
+                else:
+                    print("Bad register parse: ",regtype,regid,toss,numregs)
+            i += 1
+
+        if (numscalarresults == 0):
+            f.write("void")
+        f.write(" HELPER(%s)(CPUHexagonState *env" % tag)
+
+        i = 1
+
+        ## Arguments to the helper function are the source regs and immediates
+        for regtype,regid,toss,numregs in regs:
+            if (hex_common.is_read(regid)):
+                gen_helper_arg_opn(f,regtype,regid,i,tag)
+                i += 1
+        for immlett,bits,immshift in imms:
+            gen_helper_arg_imm(f,immlett)
+            i += 1
+        if hex_common.need_slot(tag):
+            if i > 0: f.write(", ")
+            f.write("uint32_t slot")
+            i += 1
+        if hex_common.need_part1(tag):
+            if i > 0: f.write(", ")
+            f.write("uint32_t part1")
+        f.write(")\n{\n")
+        if (not hex_common.need_slot(tag)):
+            f.write("    uint32_t slot __attribute__((unused)) = 4;\n" )
+        if hex_common.need_ea(tag): gen_decl_ea(f)
+        ## Declare the return variable
+        i=0
+        for regtype,regid,toss,numregs in regs:
+            if (hex_common.is_writeonly(regid)):
+                gen_helper_dest_decl_opn(f,regtype,regid,i)
+            i += 1
+
+        if 'A_FPOP' in hex_common.attribdict[tag]:
+            f.write('    arch_fpop_start(env);\n');
+
+        f.write("    %s\n" % hex_common.semdict[tag])
+
+        if 'A_FPOP' in hex_common.attribdict[tag]:
+            f.write('    arch_fpop_end(env);\n');
+
+        ## Save/return the return variable
+        for regtype,regid,toss,numregs in regs:
+            if (hex_common.is_written(regid)):
+                gen_helper_return_opn(f, regtype, regid, i)
+        f.write("}\n\n")
+        ## End of the helper definition
+
+def main():
+    hex_common.read_semantics_file(sys.argv[1])
+    hex_common.read_attribs_file(sys.argv[2])
+    hex_common.read_overrides_file(sys.argv[3])
+    hex_common.calculate_attribs()
+    tagregs = hex_common.get_tagregs()
+    tagimms = hex_common.get_tagimms()
+
+    with open(sys.argv[4], 'w') as f:
+        for tag in hex_common.tags:
+            ## Skip the priv instructions
+            if ( "A_PRIV" in hex_common.attribdict[tag] ) :
+                continue
+            ## Skip the guest instructions
+            if ( "A_GUEST" in hex_common.attribdict[tag] ) :
+                continue
+            ## Skip the diag instructions
+            if ( tag == "Y6_diag" ) :
+                continue
+            if ( tag == "Y6_diag0" ) :
+                continue
+            if ( tag == "Y6_diag1" ) :
+                continue
+            if ( hex_common.skip_qemu_helper(tag) ):
+                continue
+
+            gen_helper_function(f, tag, tagregs, tagimms)
+
+if __name__ == "__main__":
+    main()