general_purpose/data_transfer/stack_operations.py

# Copyright (c) 2007-2008 The Hewlett-Packard Development Company
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#
# The license below extends only to copyright in the software and shall
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# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
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# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# Authors: Gabe Black

microcode = '''
def macroop POP_R {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    ld t1, ss, [1, t0, rsp], dataSize=ssz
    addi rsp, rsp, ssz, dataSize=asz
    mov reg, reg, t1
};

def macroop POP_M {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    ld t1, ss, [1, t0, rsp], dataSize=ssz
    cda seg, sib, disp, dataSize=ssz
    addi rsp, rsp, ssz, dataSize=asz
    st t1, seg, sib, disp, dataSize=ssz
};

def macroop POP_P {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    rdip t7
    ld t1, ss, [1, t0, rsp], dataSize=ssz
    cda seg, sib, disp, dataSize=ssz
    addi rsp, rsp, ssz, dataSize=asz
    st t1, seg, riprel, disp, dataSize=ssz
};

def macroop PUSH_R {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    stupd reg, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
};

def macroop PUSH_I {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    limm t1, imm
    stupd t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
};

def macroop PUSH_M {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    ld t1, seg, sib, disp, dataSize=ssz
    stupd t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
};

def macroop PUSH_P {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    rdip t7
    ld t1, seg, riprel, disp, dataSize=ssz
    stupd t1, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
};

def macroop PUSHA {
    # Check all the stack addresses. We'll assume that if the beginning and
    # end are ok, then the stuff in the middle should be as well.
    cda ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    cda ss, [1, t0, rsp], "-8 * env.stackSize", dataSize=ssz
    stupd rax, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rcx, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rdx, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rbx, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rsp, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rbp, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rsi, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
    stupd rdi, ss, [1, t0, rsp], "-env.stackSize", dataSize=ssz
};

def macroop POPA {
    # Check all the stack addresses. We'll assume that if the beginning and
    # end are ok, then the stuff in the middle should be as well.
    ld t1, ss, [1, t0, rsp], "0 * env.stackSize", dataSize=ssz
    ld t2, ss, [1, t0, rsp], "7 * env.stackSize", dataSize=ssz
    mov rdi, rdi, t1, dataSize=ssz
    ld rsi, ss, [1, t0, rsp], "1 * env.stackSize", dataSize=ssz
    ld rbp, ss, [1, t0, rsp], "2 * env.stackSize", dataSize=ssz
    ld rbx, ss, [1, t0, rsp], "4 * env.stackSize", dataSize=ssz
    ld rdx, ss, [1, t0, rsp], "5 * env.stackSize", dataSize=ssz
    ld rcx, ss, [1, t0, rsp], "6 * env.stackSize", dataSize=ssz
    mov rax, rax, t2, dataSize=ssz
    addi rsp, rsp, "8 * env.stackSize", dataSize=asz
};

def macroop LEAVE {
    # Make the default data size of pops 64 bits in 64 bit mode
    .adjust_env oszIn64Override

    mov t1, t1, rbp, dataSize=ssz
    ld rbp, ss, [1, t0, t1], dataSize=ssz
    mov rsp, rsp, t1, dataSize=ssz
    addi rsp, rsp, ssz, dataSize=ssz
};

def macroop ENTER_I_I {
    .adjust_env oszIn64Override
    # This needs to check all the addresses it writes to before it actually
    # writes any values.

    # Pull the different components out of the immediate
    limm t1, imm, dataSize=8
    zexti t2, t1, 15, dataSize=8
    srli t1, t1, 16, dataSize=8
    zexti t1, t1, 5, dataSize=8
    # t1 is now the masked nesting level, and t2 is the amount of storage.

    # Push rbp.
    stupd rbp, ss, [1, t0, rsp], "-env.dataSize"

    # Save the stack pointer for later
    mov t6, t6, rsp

    # If the nesting level is zero, skip all this stuff.
    sub t0, t1, t0, flags=(EZF,), dataSize=2
    br label("skipLoop"), flags=(CEZF,)

    # If the level was 1, only push the saved rbp
    subi t0, t1, 1, flags=(EZF,)
    br label("bottomOfLoop"), flags=(CEZF,)

    limm t4, "ULL(-1)", dataSize=8
topOfLoop:
    ld t5, ss, [dsz, t4, rbp]
    stupd t5, ss, [1, t0, rsp], "-env.dataSize"

    # If we're not done yet, loop
    subi t4, t4, 1, dataSize=8
    add t0, t4, t1, flags=(EZF,)
    br label("topOfLoop"), flags=(nCEZF,)

bottomOfLoop:
    # Push the old rbp onto the stack
    stupd t6, ss, [1, t0, rsp], "-env.dataSize"

skipLoop:
    sub rsp, rsp, t2, dataSize=ssz
    mov rbp, rbp, t6
};
'''