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authorFrediano Ziglio <frediano.ziglio@citrix.com>2013-02-08 12:58:33 +0000
committerMatt Fleming <matt.fleming@intel.com>2013-02-11 11:51:53 +0000
commit71a16643953b812d7054784c3f7f0f03cf116264 (patch)
tree27421583722b17c111ce7c5dd9936fec72128024 /mbr/gptmbr.S
parentc1d72be30417ab699b29d560dcbf71c1cd420c34 (diff)
downloadsyslinux-71a16643953b812d7054784c3f7f0f03cf116264.tar.gz
syslinux-71a16643953b812d7054784c3f7f0f03cf116264.tar.xz
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4k_sector: Recover 3 bytes avoid a call
after read_sector %edx:%eax are unused or incremented so increment always at end gaining 3 bytes Signed-off-by: Frediano Ziglio <frediano.ziglio@citrix.com> Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'mbr/gptmbr.S')
-rw-r--r--mbr/gptmbr.S19
1 files changed, 10 insertions, 9 deletions
diff --git a/mbr/gptmbr.S b/mbr/gptmbr.S
index ae0549f0..ef2235db 100644
--- a/mbr/gptmbr.S
+++ b/mbr/gptmbr.S
@@ -142,7 +142,6 @@ next:
pushw %bx
get_ptab:
call read_sector
- call inc64
loopw get_ptab
/* Find the boot partition */
@@ -240,16 +239,9 @@ saturate_stosl:
ret
/*
- * Increment %edx:%eax
- */
-inc64:
- addl $1,%eax
- adcl $0,%edx
- ret
-
-/*
* read_sector: read a single sector pointed to by %edx:%eax to
* %es:%bx. CF is set on error. All registers saved.
+ * %edx:%eax and %es:%bx are incremented to read next sector
*/
read_sector:
pushal
@@ -282,6 +274,15 @@ read_common:
popal
jc disk_error
addb $2, %bh /* bx += 512: point to the next buffer */
+
+ /* fall through and increment sector number */
+
+/*
+ * Increment %edx:%eax
+ */
+inc64:
+ addl $1,%eax
+ adcl $0,%edx
ret
disk_error: