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Diffstat (limited to 'arch/x86/ia32/ia32entry.S')
-rw-r--r--arch/x86/ia32/ia32entry.S74
1 files changed, 43 insertions, 31 deletions
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
index b5e329da166..23d146ce676 100644
--- a/arch/x86/ia32/ia32entry.S
+++ b/arch/x86/ia32/ia32entry.S
@@ -37,6 +37,11 @@
movq %rax,R8(%rsp)
.endm
+ /*
+ * Reload arg registers from stack in case ptrace changed them.
+ * We don't reload %eax because syscall_trace_enter() returned
+ * the value it wants us to use in the table lookup.
+ */
.macro LOAD_ARGS32 offset
movl \offset(%rsp),%r11d
movl \offset+8(%rsp),%r10d
@@ -46,7 +51,6 @@
movl \offset+48(%rsp),%edx
movl \offset+56(%rsp),%esi
movl \offset+64(%rsp),%edi
- movl \offset+72(%rsp),%eax
.endm
.macro CFI_STARTPROC32 simple
@@ -61,6 +65,19 @@
CFI_UNDEFINED r15
.endm
+#ifdef CONFIG_PARAVIRT
+ENTRY(native_usergs_sysret32)
+ swapgs
+ sysretl
+ENDPROC(native_usergs_sysret32)
+
+ENTRY(native_irq_enable_sysexit)
+ swapgs
+ sti
+ sysexit
+ENDPROC(native_irq_enable_sysexit)
+#endif
+
/*
* 32bit SYSENTER instruction entry.
*
@@ -85,14 +102,14 @@ ENTRY(ia32_sysenter_target)
CFI_SIGNAL_FRAME
CFI_DEF_CFA rsp,0
CFI_REGISTER rsp,rbp
- swapgs
+ SWAPGS_UNSAFE_STACK
movq %gs:pda_kernelstack, %rsp
addq $(PDA_STACKOFFSET),%rsp
/*
* No need to follow this irqs on/off section: the syscall
* disabled irqs, here we enable it straight after entry:
*/
- sti
+ ENABLE_INTERRUPTS(CLBR_NONE)
movl %ebp,%ebp /* zero extension */
pushq $__USER32_DS
CFI_ADJUST_CFA_OFFSET 8
@@ -103,7 +120,7 @@ ENTRY(ia32_sysenter_target)
pushfq
CFI_ADJUST_CFA_OFFSET 8
/*CFI_REL_OFFSET rflags,0*/
- movl 8*3-THREAD_SIZE+threadinfo_sysenter_return(%rsp), %r10d
+ movl 8*3-THREAD_SIZE+TI_sysenter_return(%rsp), %r10d
CFI_REGISTER rip,r10
pushq $__USER32_CS
CFI_ADJUST_CFA_OFFSET 8
@@ -123,22 +140,22 @@ ENTRY(ia32_sysenter_target)
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
- orl $TS_COMPAT,threadinfo_status(%r10)
- testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
+ orl $TS_COMPAT,TI_status(%r10)
+ testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
CFI_REMEMBER_STATE
jnz sysenter_tracesys
-sysenter_do_call:
cmpl $(IA32_NR_syscalls-1),%eax
ja ia32_badsys
+sysenter_do_call:
IA32_ARG_FIXUP 1
call *ia32_sys_call_table(,%rax,8)
movq %rax,RAX-ARGOFFSET(%rsp)
GET_THREAD_INFO(%r10)
- cli
+ DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
- testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
+ testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
jnz int_ret_from_sys_call
- andl $~TS_COMPAT,threadinfo_status(%r10)
+ andl $~TS_COMPAT,TI_status(%r10)
/* clear IF, that popfq doesn't enable interrupts early */
andl $~0x200,EFLAGS-R11(%rsp)
movl RIP-R11(%rsp),%edx /* User %eip */
@@ -151,10 +168,7 @@ sysenter_do_call:
CFI_ADJUST_CFA_OFFSET -8
CFI_REGISTER rsp,rcx
TRACE_IRQS_ON
- swapgs
- sti /* sti only takes effect after the next instruction */
- /* sysexit */
- .byte 0xf, 0x35
+ ENABLE_INTERRUPTS_SYSEXIT32
sysenter_tracesys:
CFI_RESTORE_STATE
@@ -200,7 +214,7 @@ ENTRY(ia32_cstar_target)
CFI_DEF_CFA rsp,PDA_STACKOFFSET
CFI_REGISTER rip,rcx
/*CFI_REGISTER rflags,r11*/
- swapgs
+ SWAPGS_UNSAFE_STACK
movl %esp,%r8d
CFI_REGISTER rsp,r8
movq %gs:pda_kernelstack,%rsp
@@ -208,7 +222,7 @@ ENTRY(ia32_cstar_target)
* No need to follow this irqs on/off section: the syscall
* disabled irqs and here we enable it straight after entry:
*/
- sti
+ ENABLE_INTERRUPTS(CLBR_NONE)
SAVE_ARGS 8,1,1
movl %eax,%eax /* zero extension */
movq %rax,ORIG_RAX-ARGOFFSET(%rsp)
@@ -230,8 +244,8 @@ ENTRY(ia32_cstar_target)
.quad 1b,ia32_badarg
.previous
GET_THREAD_INFO(%r10)
- orl $TS_COMPAT,threadinfo_status(%r10)
- testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
+ orl $TS_COMPAT,TI_status(%r10)
+ testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
CFI_REMEMBER_STATE
jnz cstar_tracesys
cstar_do_call:
@@ -241,11 +255,11 @@ cstar_do_call:
call *ia32_sys_call_table(,%rax,8)
movq %rax,RAX-ARGOFFSET(%rsp)
GET_THREAD_INFO(%r10)
- cli
+ DISABLE_INTERRUPTS(CLBR_NONE)
TRACE_IRQS_OFF
- testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)
+ testl $_TIF_ALLWORK_MASK,TI_flags(%r10)
jnz int_ret_from_sys_call
- andl $~TS_COMPAT,threadinfo_status(%r10)
+ andl $~TS_COMPAT,TI_status(%r10)
RESTORE_ARGS 1,-ARG_SKIP,1,1,1
movl RIP-ARGOFFSET(%rsp),%ecx
CFI_REGISTER rip,rcx
@@ -254,8 +268,7 @@ cstar_do_call:
TRACE_IRQS_ON
movl RSP-ARGOFFSET(%rsp),%esp
CFI_RESTORE rsp
- swapgs
- sysretl
+ USERGS_SYSRET32
cstar_tracesys:
CFI_RESTORE_STATE
@@ -310,12 +323,13 @@ ENTRY(ia32_syscall)
/*CFI_REL_OFFSET rflags,EFLAGS-RIP*/
/*CFI_REL_OFFSET cs,CS-RIP*/
CFI_REL_OFFSET rip,RIP-RIP
- swapgs
+ PARAVIRT_ADJUST_EXCEPTION_FRAME
+ SWAPGS
/*
* No need to follow this irqs on/off section: the syscall
* disabled irqs and here we enable it straight after entry:
*/
- sti
+ ENABLE_INTERRUPTS(CLBR_NONE)
movl %eax,%eax
pushq %rax
CFI_ADJUST_CFA_OFFSET 8
@@ -324,8 +338,8 @@ ENTRY(ia32_syscall)
this could be a problem. */
SAVE_ARGS 0,0,1
GET_THREAD_INFO(%r10)
- orl $TS_COMPAT,threadinfo_status(%r10)
- testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)
+ orl $TS_COMPAT,TI_status(%r10)
+ testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
jnz ia32_tracesys
ia32_do_syscall:
cmpl $(IA32_NR_syscalls-1),%eax
@@ -370,13 +384,11 @@ quiet_ni_syscall:
PTREGSCALL stub32_rt_sigreturn, sys32_rt_sigreturn, %rdi
PTREGSCALL stub32_sigreturn, sys32_sigreturn, %rdi
PTREGSCALL stub32_sigaltstack, sys32_sigaltstack, %rdx
- PTREGSCALL stub32_sigsuspend, sys32_sigsuspend, %rcx
PTREGSCALL stub32_execve, sys32_execve, %rcx
PTREGSCALL stub32_fork, sys_fork, %rdi
PTREGSCALL stub32_clone, sys32_clone, %rdx
PTREGSCALL stub32_vfork, sys_vfork, %rdi
PTREGSCALL stub32_iopl, sys_iopl, %rsi
- PTREGSCALL stub32_rt_sigsuspend, sys_rt_sigsuspend, %rdx
ENTRY(ia32_ptregs_common)
popq %r11
@@ -476,7 +488,7 @@ ia32_sys_call_table:
.quad sys_ssetmask
.quad sys_setreuid16 /* 70 */
.quad sys_setregid16
- .quad stub32_sigsuspend
+ .quad sys32_sigsuspend
.quad compat_sys_sigpending
.quad sys_sethostname
.quad compat_sys_setrlimit /* 75 */
@@ -583,7 +595,7 @@ ia32_sys_call_table:
.quad sys32_rt_sigpending
.quad compat_sys_rt_sigtimedwait
.quad sys32_rt_sigqueueinfo
- .quad stub32_rt_sigsuspend
+ .quad sys_rt_sigsuspend
.quad sys32_pread /* 180 */
.quad sys32_pwrite
.quad sys_chown16
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 04:19:29 +0000