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hurd: Fix cancellation just before RPC call

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* sysdeps/mach/hurd/i386/intr-msg.h (INTR_MSG_TRAP): Set
	intr_port to 0 when canceled.
	* hurd/intr-msg.c (_hurd_intr_rpc_mach_msg): Pass intr_port
	address.
This commit is contained in:
Samuel Thibault 2018-10-28 12:55:24 +01:00
parent 32ad5b3328
commit 62c482e93f
3 changed files with 12 additions and 10 deletions
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8
ChangeLog
View File

@ -5,11 +5,11 @@
answer to interrupt_operation, return EIO instead of EINTR.
* sysdeps/mach/hurd/i386/intr-msg.h (INTR_MSG_TRAP): Make
_hurd_intr_rpc_msg_about_to global point to start of controlled
assembly snippet. Make it check canceled flag again.
* hurd/hurdsig.c (_hurdsig_abort_rpcs): Only mutate thread if it passed the
_hurd_intr_rpc_msg_about_to point.
assembly snippet. Make it check canceled flag.
* hurd/hurdsig.c (_hurdsig_abort_rpcs): Only mutate thread if it passed
the _hurd_intr_rpc_msg_about_to point.
* hurd/intr-msg.c (_hurd_intr_rpc_mach_msg): Remove comment on mutation
issue.
issue, remove cancel flag check.
2018-10-26 Joseph Myers <joseph@codesourcery.com>

3
hurd/intr-msg.c
View File

@ -116,7 +116,8 @@ _hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
/* Note that the signal trampoline code might modify our OPTION! */
err = INTR_MSG_TRAP (msg, option, send_size,
rcv_size, rcv_name, timeout, notify, &ss->cancel);
rcv_size, rcv_name, timeout, notify,
&ss->cancel, &ss->intr_port);
switch (err)
{

11
sysdeps/mach/hurd/i386/intr-msg.h
View File

@ -23,7 +23,7 @@
/* After _hurd_intr_rpc_msg_about_to we need to make a last check of cancel, in
case we got interrupted right before _hurd_intr_rpc_msg_about_to. */
#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify, cancel_p) \
#define INTR_MSG_TRAP(msg, option, send_size, rcv_size, rcv_name, timeout, notify, cancel_p, intr_port_p) \
({ \
error_t err; \
asm (".globl _hurd_intr_rpc_msg_about_to\n" \
@ -31,17 +31,18 @@
".globl _hurd_intr_rpc_msg_do_trap\n" \
".globl _hurd_intr_rpc_msg_in_trap\n" \
".globl _hurd_intr_rpc_msg_sp_restored\n" \
"_hurd_intr_rpc_msg_about_to: cmpl $0, %4\n" \
"_hurd_intr_rpc_msg_about_to: cmpl $0, %5\n" \
" jz _hurd_intr_rpc_msg_do\n" \
" movl %5, %%eax\n" \
" movl $0, %3\n" \
" movl %6, %%eax\n" \
" jmp _hurd_intr_rpc_msg_sp_restored\n" \
"_hurd_intr_rpc_msg_do: movl %%esp, %%ecx\n" \
" leal %3, %%esp\n" \
" leal %4, %%esp\n" \
"_hurd_intr_rpc_msg_cx_sp: movl $-25, %%eax\n" \
"_hurd_intr_rpc_msg_do_trap: lcall $7, $0 # status in %0\n" \
"_hurd_intr_rpc_msg_in_trap: movl %%ecx, %%esp\n" \
"_hurd_intr_rpc_msg_sp_restored:" \
: "=a" (err), "+m" (option), "+m" (timeout) \
: "=a" (err), "+m" (option), "+m" (timeout), "=m" (*intr_port_p) \
: "m" ((&msg)[-1]), "m" (*cancel_p), "i" (EINTR) \
: "ecx"); \
err; \