elks-enhanced - XT-Emporium

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Possible ia16-elf-gcc function prologues
----------------------------------------

SI only
 193:   56                      push   %si

SI & DI only
   0:   56                      push   %si
   1:   57                      push   %di

BASIC
   0:   55                      push   %bp
   1:   89 e5                   mov    %sp,%bp

BASIC w/SI
  3d:   56                      push   %si
  3e:   55                      push   %bp
  3f:   89 e5                   mov    %sp,%bp

BASIC w/SI & DI
 13e:   56                      push   %si
 13f:   57                      push   %di
 140:   55                      push   %bp
 141:   89 e5                   mov    %sp,%bp

BASIC w/SI & DI and small locals
 1c4:   56                      push   %si
 1c5:   57                      push   %di
 1c6:   55                      push   %bp
 1c7:   89 e5                   mov    %sp,%bp
 1c9:   83 ec 24                sub    $0x24,%sp

BASIC w/SI & DI and large locals
  6d:   56                      push   %si
  6e:   57                      push   %di
  6f:   55                      push   %bp
  70:   89 e5                   mov    %sp,%bp
  72:   81 ec 84 00             sub    $0x84,%sp

Suggested algorithm:
Search for 55 89 e5 in reverse order at IP-3 (BASIC), IP-6 (BASIC w/small locals)
and IP-6 (BASIC w/large locals).
If found, BP_PUSHED, IP=matched IP;
Then search for 57 DI_PUSHED, --IP;
then search for 56 SI_PUSHED, --IP;
Last location (IP) is then function start.

Use -finstrument-functions-simple.          # function profiling
Possibly use -fno-omit-frame-pointer.       # alwaus push BP in prologue
Possibly use -fno-optimize-sibling-calls.   # disable tail call optimization

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