From bc182ae559580d4d2cde6d5c5e8ed3bb5906bdb5 Mon Sep 17 00:00:00 2001
From: "Kartik K. Agaram" <vc@akkartik.com>
Date: Mon, 15 Mar 2021 21:22:30 -0700
Subject: boot.subx is now clean SubX

---
 linux/pack.subx | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

(limited to 'linux/pack.subx')

diff --git a/linux/pack.subx b/linux/pack.subx
index b619712a..d6ff7af5 100644
--- a/linux/pack.subx
+++ b/linux/pack.subx
@@ -1977,6 +1977,8 @@ emit-opcodes:  # line: (addr stream byte), out: (addr buffered-file)
     #   f3 xx
     #   f2 0f xx
     #   f3 0f xx
+    #   66 xx (hacky support for boot.subx)
+    #   db xx (hacky support for boot.subx)
     #
     # pseudocode:
     #   rewind-stream(line)
@@ -1985,7 +1987,7 @@ emit-opcodes:  # line: (addr stream byte), out: (addr buffered-file)
     #   if (slice-empty?(op1) || slice-starts-with?(op1, "#")) return
     #   op1 = next-token-from-slice(op1->start, op1->end, "/")
     #   write-slice-buffered(out, op1)
-    #   if !slice-equal?(op1, "0f") && !slice-equal?(op1, "f2") && !slice-equal?(op1, "f3")
+    #   if !slice-equal?(op1, "0f") && !slice-equal?(op1, "f2") && !slice-equal?(op1, "f3") && !slice-equal?(op1, "66") && !slice-equal?(op1, "db")
     #     return
     #
     #   var op2 = next-word(line)
@@ -2116,6 +2118,30 @@ $emit-opcodes:op1:
     # . if (eax != false) goto op2
     3d/compare-eax-and  0/imm32/false
     75/jump-if-!=  $emit-opcodes:op2/disp8
+    # if (slice-equal?(op1, "66")) goto op2
+    # . eax = slice-equal?(op1, "66")
+    # . . push args
+    68/push  "66"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  slice-equal?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != false) goto op2
+    3d/compare-eax-and  0/imm32/false
+    75/jump-if-!=  $emit-opcodes:op2/disp8
+    # if (slice-equal?(op1, "db")) goto op2
+    # . eax = slice-equal?(op1, "db")
+    # . . push args
+    68/push  "db"/imm32
+    51/push-ecx
+    # . . call
+    e8/call  slice-equal?/disp32
+    # . . discard args
+    81          0/subop/add         3/mod/direct    4/rm32/esp    .           .             .           .           .               8/imm32           # add to esp
+    # . if (eax != false) goto op2
+    3d/compare-eax-and  0/imm32/false
+    75/jump-if-!=  $emit-opcodes:op2/disp8
     # otherwise return
     e9/jump  $emit-opcodes:end/disp32
 $emit-opcodes:op2:
-- 
cgit 1.4.1-2-gfad0

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<td class='hashes'><div class='alt'><pre><span class='oid'><a title='author  ahriman &lt;ahriman@falte.red&gt;  2019-01-01 18:06:42 +0000
committer  ahriman &lt;ahriman@falte.red&gt;  2019-01-01 18:06:42 +0000

fixed nav links' href='/tilde/site/commit/wiki/data/cache/a/a644499e91b18989ac47a40900dffb28.metadata?id=bcb215c3a7e914d05f166846a33860e48bba64fb'>bcb215c</a></span> <a title='Blame the previous revision' href='/tilde/site/blame/wiki/data/cache/a/a644499e91b18989ac47a40900dffb28.metadata?id=e4fe58a24976bf1d649def1f421a0366b57cb6d1'>^</a>
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<td class='linenumbers'><div class='alt'><pre><a id='n1' href='#n1'>1</a>
</pre></div></td>
<td class='lines'><div><div><div class='alt'><pre>
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