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| author | Michael Brown | 2015-02-24 17:13:55 +0100 |
|---|---|---|
| committer | Michael Brown | 2015-02-24 17:33:14 +0100 |
| commit | 3e04f0791e614772f3ffe3663e4c8da71e2bc981 (patch) | |
| tree | 541275eaab72461b99f646c2e1876595199dad3e /src/arch/i386/scripts | |
| parent | [hyperv] Check for required features (diff) | |
| download | ipxe-3e04f0791e614772f3ffe3663e4c8da71e2bc981.tar.gz ipxe-3e04f0791e614772f3ffe3663e4c8da71e2bc981.tar.xz ipxe-3e04f0791e614772f3ffe3663e4c8da71e2bc981.zip | |
[prefix] Use .bss16 as temporary stack space for calls to install_block
Some decompression algorithms (e.g. LZMA) require large amounts of
temporary stack space, which may not be made available by all
prefixes. Use .bss16 as a temporary stack for the duration of the
calls to install_block (switching back to the external stack before we
start making calls into code which might access variables in .bss16),
and allow the decompressor to define a global symbol to force a
minimum value on the size of .bss16.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/arch/i386/scripts')
| -rw-r--r-- | src/arch/i386/scripts/i386.lds | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/arch/i386/scripts/i386.lds b/src/arch/i386/scripts/i386.lds index 98f95cb23..348dfefae 100644 --- a/src/arch/i386/scripts/i386.lds +++ b/src/arch/i386/scripts/i386.lds @@ -27,6 +27,13 @@ SECTIONS { PROVIDE ( _max_align = 16 ); /* + * Allow decompressor to require a minimum amount of temporary stack + * space. + * + */ + PROVIDE ( _min_decompress_stack = 0 ); + + /* * The prefix * */ @@ -87,6 +94,7 @@ SECTIONS { *(.bss16.*) *(.stack16) *(.stack16.*) + . = MAX ( ., _mdata16 + _min_decompress_stack ); _edata16 = .; } _data16_filesz = ABSOLUTE ( _mdata16 ) - ABSOLUTE ( _data16 ); |