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authorRoland McGrath <roland@redhat.com>2008-07-09 02:38:07 -0700
committerRoland McGrath <roland@redhat.com>2008-07-16 12:15:17 -0700
commitd4d67150165df8bf1cc05e532f6efca96f907cab (patch)
tree390d5951231c2a1d97d6453d70c42da7af49eeae /include/asm-x86/calling.h
parent64f097331928b01d704047c1dbc738bb6d2a9bf9 (diff)
x86 ptrace: unify syscall tracing
This unifies and cleans up the syscall tracing code on i386 and x86_64. Using a single function for entry and exit tracing on 32-bit made the do_syscall_trace() into some terrible spaghetti. The logic is clear and simple using separate syscall_trace_enter() and syscall_trace_leave() functions as on 64-bit. The unification adds PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP support on x86_64, for 32-bit ptrace() callers and for 64-bit ptrace() callers tracing either 32-bit or 64-bit tasks. It behaves just like 32-bit. Changing syscall_trace_enter() to return the syscall number shortens all the assembly paths, while adding the SYSEMU feature in a simple way. Signed-off-by: Roland McGrath <roland@redhat.com>
Diffstat (limited to 'include/asm-x86/calling.h')
-rw-r--r--include/asm-x86/calling.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/asm-x86/calling.h b/include/asm-x86/calling.h
index f13e62e2cb3..2bc162e0ec6 100644
--- a/include/asm-x86/calling.h
+++ b/include/asm-x86/calling.h
@@ -104,7 +104,7 @@
.endif
.endm
- .macro LOAD_ARGS offset
+ .macro LOAD_ARGS offset, skiprax=0
movq \offset(%rsp), %r11
movq \offset+8(%rsp), %r10
movq \offset+16(%rsp), %r9
@@ -113,7 +113,10 @@
movq \offset+48(%rsp), %rdx
movq \offset+56(%rsp), %rsi
movq \offset+64(%rsp), %rdi
+ .if \skiprax
+ .else
movq \offset+72(%rsp), %rax
+ .endif
.endm
#define REST_SKIP 6*8
@@ -165,4 +168,3 @@
.macro icebp
.byte 0xf1
.endm
-