mirror of
https://gitlab.com/sortix/sortix.git
synced 2023-02-13 20:55:38 -05:00
Allow syscall parameters and return values larger than native words.
Note: This is an incompatible ABI change.
This commit is contained in:
Jonas 'Sortie' Termansen
parent
d890488304
commit
8318c51819
8 changed files with 195 additions and 162 deletions
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@ -134,6 +134,7 @@ clock.o \
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close.o \
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$(CPUDIR)/fork.o \
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$(CPUDIR)/signal.o \
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$(CPUDIR)/syscall.o \
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dlfcn.o \
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dup.o \
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env.o \
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@ -1,6 +1,6 @@
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of the Sortix C Library.
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@ -23,7 +23,7 @@
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*******************************************************************************/
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#if defined(SORTIX_KERNEL)
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#error This part of libc should not be built in kernel mode
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#error "This file is part of user-space and should not be built in kernel mode"
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#endif
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#ifndef _SYS_SYSCALL_H
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@ -31,164 +31,72 @@
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#include <features.h>
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#include <sortix/syscallnum.h>
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#include <errno.h> /* Should not be exposed here; use an eventual __errno.h. */
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__BEGIN_DECLS
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/* Expand a macro and convert it to string. */
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#define SYSCALL_STRINGIFY_EXPAND(foo) #foo
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#define DECL_SYSCALL0(type,fn) type fn();
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#define DECL_SYSCALL1(type,fn,p1) type fn(p1);
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#define DECL_SYSCALL2(type,fn,p1,p2) type fn(p1,p2);
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#define DECL_SYSCALL3(type,fn,p1,p2,p3) type fn(p1,p2,p3);
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#define DECL_SYSCALL4(type,fn,p1,p2,p3,p4) type fn(p1,p2,p3,p4);
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#define DECL_SYSCALL5(type,fn,p1,p2,p3,p4,p5) type fn(p1,p2,p3,p4,p5);
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// System call functions for i386. (IA-32)
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/* Implement the body of a function that selects the right system call and
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jumps into the generic implementation of system calls. */
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#if defined(__i386__)
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#define DEFN_SYSCALL0(type, fn, num) \
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inline type fn() \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define SYSCALL_FUNCTION_BODY(syscall_index) \
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" mov $" SYSCALL_STRINGIFY_EXPAND(syscall_index) ", %eax\n" \
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" jmp asm_syscall\n"
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#define DEFN_SYSCALL1(type, fn, num, P1) \
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inline type fn(P1 p1) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((unsigned long)p1)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL2(type, fn, num, P1, P2) \
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inline type fn(P1 p1, P2 p2) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((unsigned long)p1), "c" ((unsigned long)p2)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL3(type, fn, num, P1, P2, P3) \
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inline type fn(P1 p1, P2 p2, P3 p3) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((unsigned long)p1), "c" ((unsigned long)p2), "d" ((unsigned long)p3)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL4(type, fn, num, P1, P2, P3, P4) \
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inline type fn(P1 p1, P2 p2, P3 p3, P4 p4) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((unsigned long)p1), "c" ((unsigned long)p2), "d" ((unsigned long)p3), "D" ((unsigned long)p4)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL5(type, fn, num, P1, P2, P3, P4, P5) \
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inline type fn(P1 p1, P2 p2, P3 p3, P4 p4, P5 p5) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num), "b" ((unsigned long)p1), "c" ((unsigned long)p2), "d" ((unsigned long)p3), "D" ((unsigned long)p4), "S" ((unsigned long)p5)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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// System call functions for x86_64. (amd64)
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#elif defined(__x86_64__)
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// TODO: Make these inline - though that requires a move advanced inline
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// assembly stub to force parameters into the right registers.
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#define SYSCALL_FUNCTION_BODY(syscall_index) \
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" mov $" SYSCALL_STRINGIFY_EXPAND(syscall_index) ", %rax\n" \
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" jmp asm_syscall\n"
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#define DEFN_SYSCALL0(type, fn, num) \
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type fn() \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL1(type, fn, num, P1) \
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type fn(P1) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL2(type, fn, num, P1, P2) \
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type fn(P1, P2) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL3(type, fn, num, P1, P2, P3) \
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type fn(P1, P2, P3) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL4(type, fn, num, P1, P2, P3, P4) \
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type fn(P1, P2, P3, P4) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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#define DEFN_SYSCALL5(type, fn, num, P1, P2, P3, P4, P5) \
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type fn(P1, P2, P3, P4, P5) \
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{ \
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type a; \
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int reterrno; \
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asm volatile("int $0x80" : "=a" (a) : "0" (num)); \
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asm volatile("movl %%edx, %0" : "=r"(reterrno)); \
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if ( reterrno ) { errno = reterrno; } \
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return a; \
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}
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// Unknown platform with no implementation available.
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#else
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#error System call interface is not declared for host system.
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#error Provide an implementation for your platform.
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#endif
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__END_DECLS
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/* Create a function that selects the right system call and jumps into the
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generic implementation of system calls. */
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#define SYSCALL_FUNCTION(syscall_name, syscall_index) \
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asm("\n" \
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".pushsection .text\n" \
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".type " #syscall_name ", @function\n" \
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#syscall_name ":\n" \
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SYSCALL_FUNCTION_BODY(syscall_index) \
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".popsection\n" \
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);
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/* Create a function that performs the system call by injecting the right
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instructions into the compiler assembly output. Then provide a declaration of
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the function that looks just like the caller wants it. */
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#define DEFINE_SYSCALL(syscall_type, syscall_name, syscall_index, syscall_formals) \
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SYSCALL_FUNCTION(syscall_name, syscall_index) \
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__BEGIN_DECLS \
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extern "C" { syscall_type syscall_name syscall_formals; } \
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__END_DECLS \
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/* System call accepting no parameters. */
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#define DEFN_SYSCALL0(type, fn, num) \
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DEFINE_SYSCALL(type, fn, num, ())
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/* System call accepting 1 parameter. */
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#define DEFN_SYSCALL1(type, fn, num, t1) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1))
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/* System call accepting 2 parameters. */
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#define DEFN_SYSCALL2(type, fn, num, t1, t2) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2))
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/* System call accepting 3 parameters. */
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#define DEFN_SYSCALL3(type, fn, num, t1, t2, t3) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3))
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/* System call accepting 4 parameters. */
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#define DEFN_SYSCALL4(type, fn, num, t1, t2, t3, t4) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3, t4 p4))
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/* System call accepting 5 parameters. */
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#define DEFN_SYSCALL5(type, fn, num, t1, t2, t3, t4, t5) \
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DEFINE_SYSCALL(type, fn, num, (t1 p1, t2 p2, t3 p3, t4 p4, t5 p5))
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#endif
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60
libc/x64/syscall.s
Normal file
60
libc/x64/syscall.s
Normal file
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@ -0,0 +1,60 @@
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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x64/syscall.s
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Function for performing system calls.
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*******************************************************************************/
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# x86_64 system call conventions:
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# interrupt 128
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# system call number: %rax
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# parameters: %rdi, %rsi, %rdx, %rcx, %r8, %r9
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# return value: %rax, %rdx
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# return errno: %rcx
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# clobbered: %rdi, %rsi, %r8, %r9, %r10, %r11
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# preserved: %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15
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.section .text
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.global asm_syscall
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asm_syscall: /* syscall num in %rax. */
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push %rbp
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mov %rsp, %rbp
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int $0x80
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test %ecx, %ecx
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jnz 1f
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pop %rbp
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ret
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1:
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push %rbx
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push %r12
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push %r13
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mov %ecx, %ebx # preserve: ret_errno
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mov %rax, %r12 # preserve: ret_low
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mov %rdx, %r13 # preserve: ret_high
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call get_errno_location # get_errno_location()
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mov %ebx, (%rax) # *get_errno_location() = ret_errno
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mov %r12, %rax # restore: ret_low
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mov %r13, %rdx # restore: ret_high
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pop %r13
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pop %r12
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pop %rbx
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pop %rbp
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ret
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64
libc/x86/syscall.s
Normal file
64
libc/x86/syscall.s
Normal file
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@ -0,0 +1,64 @@
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2013.
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This file is part of the Sortix C Library.
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The Sortix C Library is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at your
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option) any later version.
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The Sortix C Library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with the Sortix C Library. If not, see <http://www.gnu.org/licenses/>.
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x86/syscall.s
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Function for performing system calls.
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*******************************************************************************/
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# i386 system call conventions:
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# interrupt 128
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# system call number: %eax
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# parameters: %ebx, %ecx, %edx, %edi, %esi
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# return value: %eax, %edx
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# return errno: %ecx
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# clobbered: %ebx, %edi, %esi
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# preserved: %ebp, %esp
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.section .text
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.global asm_syscall
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asm_syscall: /* syscall num in %eax. */
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push %ebp
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mov %esp, %ebp
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push %ebx
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push %edi
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push %esi
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# 0 (%ebp) # saved_ebp
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# 4 (%ebp) # return_eip
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mov 8 (%ebp), %ebx # param_word1
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mov 12(%ebp), %ecx # param_word2
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mov 16(%ebp), %edx # param_word3
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mov 20(%ebp), %edi # param_word4
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mov 24(%ebp), %esi # param_word5
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int $0x80
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test %ecx, %ecx # ret_errno & ret_errno
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jz 1f # if ( !(ret_errno & ret_errno) )
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mov %eax, %ebx # preserve: ret_low
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mov %edx, %edi # preserve: ret_high
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mov %ecx, %esi # preserve: ret_errno
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call get_errno_location # get_errno_location()
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mov %esi, (%eax) # *get_errno_location() = ret_errno
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mov %ebx, %eax # restore: ret_low
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mov %edi, %edx # restore: ret_high
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1:
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pop %esi
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pop %edi
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pop %ebx
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pop %ebp
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ret
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@ -1,6 +1,6 @@
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/*******************************************************************************
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
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Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
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This file is part of Sortix.
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@ -65,9 +65,9 @@ valid_syscall:
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movl %ebp, %fs
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movl %ebp, %gs
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# Return to user-space, system call result in %rax, errno in %edx.
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# Return to user-space, system call result in %rax:%rdx, errno in %ecx.
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popq %rbp
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movl global_errno, %edx
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movl global_errno, %ecx
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# If any signals are pending, fire them now.
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movq asm_signal_is_pending, %rdi
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@ -88,7 +88,7 @@ call_signal_dispatcher:
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# handle it for us when the signal is over.
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movq 0(%rsp), %rdi # userspace rip
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movq 16(%rsp), %rsi # userspace rflags
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movq 24(%rsp), %rcx # userspace rsp, note %rdx is used for errno
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movq 24(%rsp), %r8 # userspace rsp, note %rcx is used for errno
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int $130 # Deliver pending signals.
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# If we end up here, it means that the signal didn't override anything and
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# that we should just go ahead and return to userspace ourselves.
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@ -119,7 +119,7 @@ namespace Sortix
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return;
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regs->rip = regs->rdi;
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regs->rflags = regs->rsi;
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regs->userrsp = regs->rcx;
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regs->userrsp = regs->r8;
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regs->cs = UCS | URPL;
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regs->ds = UDS | URPL;
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regs->ss = UDS | URPL;
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@ -1,6 +1,6 @@
|
|||
/*******************************************************************************
|
||||
|
||||
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012.
|
||||
Copyright(C) Jonas 'Sortie' Termansen 2011, 2012, 2013.
|
||||
|
||||
This file is part of Sortix.
|
||||
|
||||
|
|
@ -17,7 +17,7 @@
|
|||
You should have received a copy of the GNU General Public License along with
|
||||
Sortix. If not, see <http://www.gnu.org/licenses/>.
|
||||
|
||||
syscall.s
|
||||
x86/syscall.s
|
||||
An assembly stub that acts as glue for system calls.
|
||||
|
||||
*******************************************************************************/
|
||||
|
|
@ -69,13 +69,13 @@ valid_syscall:
|
|||
movl %ebp, %fs
|
||||
movl %ebp, %gs
|
||||
|
||||
# Return to user-space, system call result in %eax, errno in %edx.
|
||||
# Return to user-space, system call result in %eax:%edx, errno in %ecx.
|
||||
popl %ebp
|
||||
movl global_errno, %edx
|
||||
movl global_errno, %ecx
|
||||
|
||||
# If any signals are pending, fire them now.
|
||||
movl asm_signal_is_pending, %ecx
|
||||
testl %ecx, %ecx
|
||||
movl asm_signal_is_pending, %ebx
|
||||
testl %ebx, %ebx
|
||||
jnz call_signal_dispatcher
|
||||
|
||||
iretl
|
||||
|
|
@ -90,7 +90,7 @@ call_signal_dispatcher:
|
|||
# call is made this stack will get reused and all our nice temporaries wil
|
||||
# be garbage. We therefore pass the kernel the state to return to and it'll
|
||||
# handle it for us when the signal is over.
|
||||
movl %esp, %ecx
|
||||
movl %esp, %ebx
|
||||
int $130 # Deliver pending signals.
|
||||
# If we end up here, it means that the signal didn't override anything and
|
||||
# that we should just go ahead and return to userspace ourselves.
|
||||
|
|
|
|||
|
|
@ -96,7 +96,7 @@ namespace Sortix
|
|||
{
|
||||
if ( regs->InUserspace() )
|
||||
return;
|
||||
uint32_t* params = (uint32_t*) regs->ecx;
|
||||
uint32_t* params = (uint32_t*) regs->ebx;
|
||||
regs->eip = params[0];
|
||||
regs->eflags = params[2];
|
||||
regs->useresp = params[3];
|
||||
|
|
|
|||
Loading…
Reference in a new issue