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Code Issues Releases Activity

Reinstate the ptrace patch to restore the 'gp' register after calling

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a function. I made a mistake in assuming that the .cprestore directive
will cause the assembler to automatically restore 'gp' after the 'jalr'.

The .cprestore directive does its magic only after 'jal' and 'bal'
instructions - not the 'jalr'.

Pointed out by: c.jayachandran@gmail.com
This commit is contained in:
Neel Natu 2010-02-04 05:49:59 +00:00
parent 674440a942
commit 2f9f616df9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=203475
1 changed files with 3 additions and 0 deletions
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3
lib/libc/mips/sys/ptrace.S
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@ -56,6 +56,9 @@ LEAF(ptrace)
#endif
la t9, _C_LABEL(__error) # locate address of errno
jalr t9
#ifdef __ABICALLS__
lw gp, 16(sp)
#endif
sw zero, 0(v0)
lw ra, 32(sp)
addu sp, sp, 40